2014 AIMR Tohoku University-NCTU Joint Workshop
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AIMR Tohoku University-NCTU Joint Workshop on
Fusion of Mathematics, Nano-Materials, and Nano-Devices
台日東北大/交大元件、材料、與數學跨領域國際研討會
International Conference Hall, Tin Ka-Ping Photonics Building,
National Chiao Tung University, Hsinchu, Taiwan,
國立交通大學田家炳光電大樓國際演講廳
September 22-23 2014
http://ece-workshop.nctu.edu.tw
2014 AIMR Tohoku University-NCTU Joint Workshop
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The Map of National Chiao Tung University
Conference site: International Conference Hall, Tin Ka-Ping Photonics Building,
2014 AIMR Tohoku University-NCTU Joint Workshop
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Foreword
Dear Colleagues:
It is our great pleasure to welcome you to the “AIMR Tohoku University-NCTU Joint
Workshop on Fusion of Mathematics, Nano-Materials, and Nano-Devices”. The joint workshop
will be held September 22-23, 2014 at the National Chiao-Tung University in Hsinchu, Taiwan.
Hsinchu is a beautiful city which provides rich and vibrant Hakka culture. It has also been known
for the nursery of Taiwanese semiconductor industry.
The purpose of this workshop is essentially to promote interactions among researchers from
many disciplines across materials science, solid state device physics, and mathematics in both
universities. We hope to stimulate scientific idea exchanges and future collaboration among
participants, as well as provide a learning environment for the audience to catch up with the
fundamentals and latest development in these research areas. In our modest way, we also strive to
create a forum which encourages discussion and advances understanding in order to hasten the
fusion of nano-technologies, materials, devices, and mathematics for applications that benefit
humankind. This year, we are pleased to have many foreign and domestic distinguished scientists
as speakers, including Prof. Simon Sze and Prof. M. Kotani as our keynote speech presenters. We
sincerely thank all of you for your contributions as speakers or audience to this workshop.
On behalf of the organizing committee, we also like to thank many organizing institutes and
sponsoring organizations for financial support. In addition, without the diligent assistance from
the executive secretaries, symposium administrative assistants, and conference site assistants, this
workshop would not be made possible.
We hope you have a good time in Hsinchu and enjoy the conference.
Chun-Yen Chang, General Chair and Chair Professor
Yan-Hwa Wu Lee, Honorary General Chair and President
National Chiao Tung University
2014 AIMR Tohoku University-NCTU Joint Workshop
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Acknowledgment
主辦單位 Principle Organizing Institutes
國立交通大學 National Chiao Tung University
日本東北大學 Tohoku University
協辦單位 Co-Organizing Institutes
國立交通大學 電機學院 NCTU College of Electrical and Computer Engineering
國立交通大學 電機工程系 NCTU Dept. of Electrical and Computer Engineering
國立交通大學 光電工程系 NCTU Dept. of Photonics
國立交通大學 前瞻光電研究中心 NCTU X-Photonics Interdisciplinary Center
贊助單位 Sponsors
國立交通大學 頂尖大學計畫辦公室 NCTU Aiming for the Top University Program
國立交通大學 校友會 NCTU Alumni Association
安楊材料科技股份有限公司 Epion Technology Corporation Ltd.
漢民科技股份有限公司 Hermes-Epitek Corporation Ltd.
2014 AIMR Tohoku University-NCTU Joint Workshop
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AIMR Tohoku University-NCTU Joint Workshop on
Fusion of Mathematics, Nano-Materials, and Nano-Devices
台日東北大交大元件、材料、與數學跨領域國際研討會
International Conference Hall, Tin Ka-Ping Photonics Building,
National Chiao Tung University, Hsinchu, Taiwan, Sept. 22nd – 23rd, 2014
Organizing Committee
General Chair: Chun-Yen Chang (Chair Prof., NCTU)
Co-General Chair: Motoko Kotani (Director of AIMR, Tohoku University)
Honorary General Chair: Yan-Hwa Wu Lee (President, NCTU)
Steering Committee
Chair: Edward Yi Chang (NCTU)
Co-Chair: Seiji Samukawa (Tohoku University)
Secretary: Yiming Li, Peichen Yu, and Hsiao-Wen Zan (NCTU)
Akio Higo (Tohoku University)
Session Program Chairs
Mathematics Sessions:
Yasumasa Nishiura (Tohoku University)
Wen-Wei Lin (NCTU)
Material Sessions:
Tadafumi Adschiri (Tohoku University)
Edward Yi Chang (NCTU)
Device Sessions:
Seiji Samukawa (Tohoku University)
Horng-Chih Lin (NCTU)
2014 AIMR Tohoku University-NCTU Joint Workshop
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Program September 22nd
1. Registration 8:30~9:00 (Conference Staff) Conference Venue: International Conference Hall, Tin Ka-Ping Photonic Building, National Chiao Tung University
2. Opening Keynote Session 9:00~10:25 (Chair: Edward Yi Chang) 9:00~9:15 Opening Remarks
- General Chair Chun-Yen Chang (NCTU) - Co-General Chair Motoko Kotani (Tohoku University) - Vice President Han-Ping D. Shieh (NCTU)
9:15~9:45 “Challenge at AIMR, Tohoku University through Fusion of Mathematics, Materials and Devices,” Motoko Kotani (Tohoku University)
9:45~10:25 “The Floating-Gate Non-Volatile Semiconductor Memory - From Conception to the Digital Age,” Simon M. Sze (NCTU)
Coffee Break (20 min)
3. Session 1: Nano-Devices I 10:45~12:00 (Chair: Horng-Chih Lin)
10:45~11:10 “Novel Metal Oxidation Process by Using a Neutral Beam and its Application to Electronic Nano-Devices,” Takeo Ohno (Tohoku University)
11:10~11:35 “A General Curve on the Variation of Trigate FinFET Devices,” Steve Chung (NCTU) 11:35~12:00 “Complex Hydrides for Electrochemical Energy Storage,” Atsushi Unemoto (Tohoku
university)
Lunch Break (12:00~13:20)
4. Session 2: Mathematics I 13:20~15:00 (Chair: Yasumasa Nishiura)
13:20~13:45 “Motion and Shape of Drops in Active Soft Materials,” Natsuhiko Yoshinaga (Tohoku University)
13:45~14:10 “Dynamics on the Network of Hindmarsh-Rose Neurons,” Jong Juang (NCTU) 14:10~14:35 “Controlling of Particles with Fluctuations -Toward Applications of Nano-Devices-,”
Miki Kobayashi (Tohoku University) 14:35~15:00 “Weak Interaction of Solitary Pulses in Thin Liquid Films,” Te-Sheng Lin (NCTU)
Coffee Break (20 min)
5. Session 3: Mathematics II 15:20~17:00 (Chair: Wen-Wei Lin)
15:20~15:45 “Charge Transport Inside of Organic Crystals: The Crucial Role of Correlated Fluctuations,” Daniel Packwood (Tohoku University)
15:45~16:10 “A Reconstruction Algorithm for Free Form Lens Designs,” Chin-Tien Wu (NCTU) 16:10~16:35 “Statistical Mechanics Reconstruction of the Structure of Gold Nano-Cluster,” Chihiro
Nakajima (Tohoku University) 16:35~17:00 “A Random Time in Sampling One-Dimensional Distributions,” Guan-Yu Chen (NCTU)
6. Welcome Reception 18:00~20:00
Miramar Hotel Hsinchu
Music Performance: NCTU Music Institute
2014 AIMR Tohoku University-NCTU Joint Workshop
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September 23rd
7. Plenary Session 9:00~10:20 (Chair: Yiming Li) 9:00~9:40 “Future Japan & Taiwan.,” Chun-Yen Chang (NCTU) 9:40~10:20 “Neutral Beam Technology - Defect-Free Nanofabrication for Novel Nano-materials and
Nano-devices-,” Seiji Samukawa (Tohoku University)
Coffee Break (20 min)
8. Session 4: Nano-devices II 10:40~11:55 (Chair: Seiji Samukawa)
10:40~11:05 “Synthesis and Characterization of Nanostructured Electrocatalysts for Fuel Cell Applications,” Puwei Wu (NCTU)
11:05~11:30 “Biosensing and Bioimaging with Integrated Electrochemical Sensor Arrays.” Kumi Y. Inoue (Tohoku University)
11:30~11:55 “Growth of Zincblende GaN on C-plane Patterned Sapphire Substrate,” Yew Chung Sermon Wu (NCTU)
Lunch Break (12:00~13:20)
9. Session 5: Nano-materials I 13:20~14:35 (Chair: Yuan-Chieh Tseng)
13:20~13:45 “Heterogeneous Behavior in Dynamics at the Surface Layer of Glassy Polymer Films,” Nguyen Hung Kim (Tohoku University)
13:45~14:10 “Spintronic Materials Explored by Modern X-ray Absorption Spectroscopy,” Yuan-Chieh Tseng (NCTU)
14:10~14:35 “Particle Re-dispersion and Viscosity of Nanofluid in Shear Stress Field,” Nobuaki Aoki (Tohoku University)
Coffee Break (20 min)
10. Session 6: Nano-materials II 14:55~16:10 (Chair: Akio Higo)
14:55~15:20 “Development of Energy Harvesting Technology,” Yi Chiu (NCTU) 15:20~15:45 “Nanoparticle Synthesis Under Supercritical Condition -Toward Device / Hybrid
Materials Fabrications-,” Daisuke Hojo and Tadafumi Adschiri (Tohoku University) 15:45~16:10 “Self-Assembly Applications of Supramolecular Complexes and Nanocomposites,”
Hong Cheu Lin (NCTU)
Coffee Break (10 min)
11. Session 7: Panel Discussion 16:20~17:10 (Chairs: Hong Cheu Lin and Seiji Samukawa)
Yasumasa Nishiura (Tohoku University) and Wen-Wei Lin (NCTU) “Fusion of Nano-Devices and Mathematics”
12. Closing Remarks 17:10~17:20
General Chair Chun-Yen Chang (NCTU)
13. Banquet 18:00~20:00
Ambassador Hotel Hsinchu Music Performance: Muson Band
2014 AIMR Tohoku University-NCTU Joint Workshop
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Motoko KOTANI
Advanced Institute for Materials Research,
&Mathematics Institute, Graduate School of Science
Tohoku University
2-1-1 Katahira Aoba-ku, Sendai
980-8577 Japan
1. Education
The University of Tokyo B.S. 1983 Mathematics
Tokyo Metropolitan University M.S. 1985 Mathematics
Tokyo Metropolitan University D.Sci. 1990 Mathematics
2. Professional Experiences 1990-1997: Lecturer, Department of Mathematics. Faculty of Science, Toho University
1993-1994: Visiting Researcher, Max-Planck Society for the Advancement of Science
1997-1999: Associate Professor, Department of Mathematics. Faculty of Science, Toho University
1999-2003: Associate Professor, Mathematics Institute, Graduate School of Science, Tohoku University
2001.4-2001.11: Visiting Professor, Institute of Advanced Scientific Studies (IHES)
2004-present: Professor, Mathematics Institute, Graduate School of Science, Tohoku University
2008-2014.3: Distinguished Professor, Mathematics Institute, Graduate School of Science, Tohoku
University
2011-2012: Deputy Director, Professor, AIMR, Tohoku University
2012-present: Director, AIMR, Tohoku University
3. Scientific Interests:
Discrete Geometric Analysis
4. Major Awards and Honors
2005 Saruhashi Prize
5. Recent papers :(5 papers)
1. Negatively curved cubic carbon crystals with octahedral symmetry, M. Tagami, Y. Liang, H.
Naito, Y. Kawazoe, M. Kotani, Carbon, 2014
2. Geometric measures of finite carbon nanotube molecules: A proposal for length index and filling
indexes, T. Matsuno, H. Naito, S. Hitosugi, S. Sato, M. Kotani, H. Isobe. Pure and Appl.
Chem.,2014, 86, (4), 489-495
3. Geometric frustration of icosahedron in metallic glasses, A. Hirata, L. J. Kang, T. Fujita, B.
Klumov, K. Matsue, M. Kotani, A. R. Yavari, M. W. Chen, Science 341(6144),376-379
4. New Growth Mechanism of Cubic Rh Clusters Composed of 812 Atoms Found by the Method
of Euclidean Designs, Makoto Tagami1, Yunye Liang, Yoshiyuki Kawazoe and Motoko Kotani,
Materials Transactions, Vol. 53, No. 3 (2012) pp. 459 to 462
2014 AIMR Tohoku University-NCTU Joint Workshop
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Challenge at AIMR, Tohoku University
Through Fusion of Mathematics, Materials and Devices
Motoko KOTANI
Advanced Institute for Materials Research and
Mathematics Institute, Graduate School of Science
Tohoku University
Phone: +81222175130, Fax: +81222175129
e-mail: [email protected]
URL: http://www.math.tohoku.ac.jp/english/people/kotani-e.html
http://www.mathmate.tohoku.ac.jp/english/index.html
Abstract
AIMR was established as one of the WPI research centers under the World Premier International
Research Center Initiative Program by the government. The aim of the program is to build international
research centers within Japan which are visible in the world. AIMR, as a WPI research center, has made
much effort to pursue four missions: top level science, globalization, system reform and challenges to a new
research area by interdisciplinary team, and attracted excellent researchers from all around the world.
From its establishment in 2007, AIMR’s ultimate goal is to integrate materials science with physics,
chemistry and engineerining to create a new materials science which is apropriate for the 21st centery and
gathers outstanding researchers from all around the world to achieve the goal. In FY 2012, AIMR proposed
a clrea vision and research strategy, “mathematics-materials science collaboration” to build the basis for
materials science which can predict functions and properties, and enabling the smart design of materials.
We set three target projects: non- equilibrium materials based on mathematical dynamical systems,
topological functional materials, and multi-scale hierarchical materials based on discrete geometric
analysis to advance the mathematics-materials science collaboration.
In the presentation, I would like to introduce some of emerging results from the target projects.
2014 AIMR Tohoku University-NCTU Joint Workshop
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Biodata of Dr. Simon M. Sze
Dr. Simon M. Sze received his B. S. degree from the
National Taiwan University, M. S. from the University of
Washington, and Ph. D. from Stanford University, all in
Electrical Engineering.
Dr. Sze was with Bell Telephone Laboratories from 1963 to
1989 as a member of the Technical Staff. He joined the National Chiao Tung
University (NCTU) from 1990 to 2006 as a Distinguished Professor. At present,
he is an Honorary Chair Professor at NCTU. Dr. Sze has served as Visiting
Professor to many academic institutions including the University of Cambridge,
Delft University, the University of Hong Kong, Stanford University, Swiss Federal
Institute of Technology, and Tokyo Institute of Technology.
He has made fundamental and pioneering contributions to semiconductor
devices, especially the metal-semiconductor contacts, microwave devices, and
submicron MOSFET technology. Of particular importance is his discovery with
Dr. D. Kahng of the non-volatile semiconductor memory (NVSM) effect which has
subsequently given rise to a large family of memory devices including the Flash
memory and EEPROM. NVSM has enabled the development of all modern
electronic systems such as the digital cellular phone, tablet computer, personal
digital assistant, smart IC card, digital camera, digital television, portable DVD,
MP3 music player, pacemaker, implantable defibrillator, global positioning system
(GPS), and anti-lock braking system (ABS).
Dr. Sze has authored or coauthored over three hundred technical papers. He
has written and edited 16 books. His book “ Physics of Semiconductor Devices ”
( Wiley, 1969; 2nd Ed, 1981; 3rd
Ed, 2007 ) is one of the most cited works in
contemporary engineering and applied science publications ( over 24,000 citations
according to ISI Press ). Dr. Sze has received the IEEE J. J. Ebers Award, the
Sun Yet-sen Award, the National Endowed Chair Professor Award, and the
National Science and Technology Prize. He is a Life Fellow of IEEE, an
Academician of the Academia Sinica, a foreign member of the Chinese Academy
of Engineering, and a member of the US National Academy of Engineering.
2014 AIMR Tohoku University-NCTU Joint Workshop
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The Floating-Gate Non-Volatile Semiconductor Memory -
From Conception to the Digital Age
S. M. Sze
National Chiao Tung University, Hsinchu, Taiwan, ROC
Abstract
In the past 47 years (from 1967 to 2014), the non-volatile semiconductor memory (NVSM) has emerged
from a floating-gate concept to the prime technology driver of the largest industry in the world – the
electronics industry. In this paper, we briefly review the historical development of NVSM and project its
future trends to the year 2020. In addition, we consider NVSM’s wide-range of applications from the digital
cellular phone to tablet computer to digital television. As the device dimension is scaled down to the
deca-nanometer regime, we expect that many innovations will be made to meet the scaling challenges, and
NVSM-inspired technology will continue to enrich and improve our lives for decades to come.
2014 AIMR Tohoku University-NCTU Joint Workshop
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Takeo OHNO
Affiliation:WPI-AIMR, Tohoku University
PRESTO, JST
Address: 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN
1. Education
2005, Ph.D. in Materials Science, Tohoku University, Japan
2. Professional Experiences
2008-2009, Postdoctoral Researcher, UCLA, USA
2007-2012, NIMS Postdoctoral Researcher, NIMS, Japan
2006-2007, Postdoctoral Researcher, Tohoku University, Japan
2005-2006, Postdoctoral Research Fellow (PD), JSPS, Japan
2004-2005, Doctoral Research Fellow (DC2) JSPS, Japan
3. Scientific Interests:
Nanoionic memory, Neuromorphic system, Semiconductor growth and device
4. Major Awards and Honors
2005, The 11th Research Encouraging Prize, Aoba Foundation for The Promotion of Engineering
5. Recent papers: (5 papers)
A. Nayak et al., Adv. Funct. Mater. 2012, 22, 3606.
T. Ohno et al., Appl. Phys. Lett. 2011, 99, 203108.
T. Ohno et al., Nature Mater. 2011, 10, 591.
2014 AIMR Tohoku University-NCTU Joint Workshop
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Novel Metal Oxidation Process by using a Neutral Beam
and its Application to Electronic Nano-devices
Takeo OHNO and Seiji SAMUKAWA
WPI-AIMR, Tohoku University
PRESTO, JST
2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN
Phone: +81-22-217-5316
e-mail: [email protected]
Abstract
Fabrication of electronic devices such as memory and transistor is one of the most important factor for
information technology. Among of memories, nanoionic memory has been proposed as a candidate for
future generation non-volatile memory. Oxide-based electrochemical metallization memory as well as
valence change memory requires a high quality oxide film as a solid electrolyte with nanometer thickness to
improve device performance. Germanium transistor is also one of the most promising transistor devices due
to higher carrier mobilities for both electrons and holes than those in silicon. In a Ge MOSFET structure,
high quality and very thin high-k oxide film is needed to obtain good gate characteristics. To form an
ultrathin oxide film, we have proposed novel metal oxidation process named “Neutral Beam Oxidation
(NBO)” [1–3]. This technique has advantages for thin film oxidation such as elimination of UV photons,
prevention of charge build-up and low-temperature process. In this talk, we report the formation of
nanometer-thick metallic oxide film of tantalum and alminum by using NBO process and also demonstrate
resistive switching in the tantalum oxide film and MOS capacitor operation in the AlOx/GeOx/Ge gate
structure.
[1] S. Samukawa et al., J. Vac. Sci. Technol. A 20, 1566 (2002).
[2] M. Yonemoto, S. Samukawa et al., Jpn. J. Appl. Phys. 48, 04C007 (2009).
[3] A. Wada, S. Samukawa et al., Appl. Phys. Lett. 98, 203111 (2011).
2014 AIMR Tohoku University-NCTU Joint Workshop
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STEVE S. CHUNG received his Ph.D. degree from the University of
Illinois at Urbana-Champaign, in Electrical Engineering in 1985. His
Ph.D. thesis advisor is the world-famous scholar and CMOS
Co-Inventor, Prof. C. T. Sah.
Currently, he is NCTU and UMC Chair Professor at the National
Chiao Tung University (NCTU). After joining NCTU in 1987, he
has been the first Department Head of EECS Honors Program from 2004-2005, the Dean
of International Affairs Office, Executive Director of school level research center, from
2007-2008. He was a Research Visiting Scholar with Stanford University in 2001, visiting
professor to University of California-Merced in 2009-2010, and taught graduate courses
at Stanford and UC-Merced in the Fall of 2009. He was also an honorary professor of the
Institute of Microelectronics, CAS. He has been the consultant to the two world largest IC
foundries, TSMC and UMC. His recent current research areas include- nanoscale CMOS
devices and technology; low voltage/power design of Si/III-V devices, nonvolatile
memory technology and reliability; and reliability physics/interface characterization. By
the end of 2014, he has more than 25 times oral presentations in the IEEE flagship
conferences, IEDM and VLSI. In particular, he was the first (from Taiwan) to present the
paper at VLSI Technology symposium in 1995.
He is an IEEE Fellow, the current IEEE EDS BoG(Board of Governor) member, IEEE
Distinguished Lecturer, EDS Regions/Chapters Chair, EDS Taipei chapter chair, Editor
of J-EDS, and with past involvement as EDS AdCom member (2004-2009), EDS
Regions/Chapters Vice-Chair, and Editor of EDL(2002-2008). He has served on various
important conference committees, e.g., VLSI Technology, IEDM, IRPS, IPFA, ICMTS,
SNW, VLSI-TSA, SSDM etc. He was awarded 3 times outstanding Research Award,
distinguished PI, and distinguished NSC Research Fellow, from the National Science
Council; Distinguished EE Professor and Engineering Professor of the Engineering
Societies in Taiwan. More recently, he received 2013 Pan Wen Yuan award in
recognizing his outstanding achievements in the semiconductor research.
2014 AIMR Tohoku University-NCTU Joint Workshop
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A General Curve on the Variation of Trigate FinFET Devices
Steve S. Chung
NCTU Chair Professor/UMC Chair Professor/IEEE Fellow
Department of Electronics Engineering, National Chiao Tung University, Taiwan
TEL: +886-3-5731830 Fax: +886-3-5734608 email: [email protected]
Abstract
Moore’s Law has driven CMOS devices scaling for several decades. The random phenomenon becomes
increasingly important with the further scaling of CMOS technology. The random dopant fluctuation (RDF),
is one of the most important issues for sub-50nm CMOS technologies in terms of the device architecture
and manufacturing with the drastic scaling of CMOS technology. In the past, variations associated with
implant and RTA anneal, the strain effect, and gate material, have received quite a lot of attentions. To solve
RDF, carbon co-implant, FDSOI or FinFET, and high-k gate dielectric have been proposed to reduce the
variability effectively. However, the understanding on the RDF has almost been understood through the
simulations. Until more recently, the understanding of the RDF became possible by the experimental
approach [1-2].
In this talk, the theoretical basis from an experimental dopant profiling technique will first be introduced
to analyze the RDF effect. The dopant profiling technique has been further elaborated on trigate MOSFETs
to study the process induced effects such as boron clustering, sidewall roughness effect, fin-height induced
variation etc. Then, a unique gate oxide variation theory [3] will be introduced to understand the 3D gate
structure and its impact on the FinFET device. A general curve on the understanding of the above effects
will all be presented.
[1] E. R. Hsieh, S. S. Chung et al., Symp. on VLSI Technology, 152(2011).
[2] H. M. Tsai, E. R. Hsieh, S. S. Chung et al., Symp. on VLSI Technology, 189(2012).
[3] E. R. Hsieh, S. T. Lin, S. S. Chung et al., IEDM, 770(2013).
2014 AIMR Tohoku University-NCTU Joint Workshop
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Dr. Atsushi UNEMOTO
Affiliation:WPI-Advanced Institute for Materials Research
(WPI-AIMR)
Address: 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
1. Education
2007–2009 Ph.D. in Environmental Studies, Graduate School of Environmental Studies, Tohoku
University
2005–2007 M.S. in Engineering, Graduate School of Engineering, Tohoku University
2001–2005 B.S. in Engineering, School of Engineering, Tohoku University
2. Professional Experiences
2013- Lecturer, WPI-Advanced Institute of Materials Research (WPI-AIMR), Tohoku University
2010 Assistant Professor, Institute of Multidisciplianry Research for Advanced Materials, Tohoku
University
2009 Assistant Professor, Graduate School of Engineering, Tohoku University
3. Scientific Interests:
Solid-state ionics, solid-state electrochemistry, rechargeable battery, hydrides
4. Major Awards and Honors
2013.5 Best Poster Award, 125th Conference of the Institute for Materials Research, Tohoku University
2008–2009 Japan Society for the Promotion of Science (JSPS) Fellowship
2007.5 Excellent Scientific Achievement Award, 5th International Conference on Hydrogen Economy
and Hydrogen Treatment of Materials, Donetsk, Ukraine
5. Recent papers :
Atsushi Unemoto, Syun Yasaku, Genki Nogami, Masaru Tazawa, Mitsugu Taniguchi, Motoaki Matsuo,
Tamio Ikeshoji, Shin-ichi Orimo, “Development of bulk-type all-solid-state lithium-sulfur battery using
LiBH4 electrolyte”, Appl. Phys. Lett. (In press).
Atsushi Unemoto, Motoaki Matsuo, Shin-ichi Orimo, “Complex hydrides for electrochemical energy
storage (feature article)”, Adv. Funct. Mater. 24 (2014) 2267-2279; ChemInform 24 (2014) 29.
Terrence J. Udovic, Motoaki Matsuo, Atsushi Unemoto, Nina Verdal, Vitalie Stavila, Alexander V.
Skripov, John J. Rush, Hitoshi Takamura, Shin-ichi Orimo, “Sodium superionic conduction in Na2B12H12”,
Chem. Comm. 50 (2014) 3750-3752.
Atsushi Unemoto, Yoshiyuki Gambe, Daiki Komatsu, Itaru Honma, “Development of high capacity
all-solid-state lithium battery using quasi-solid-state electrolyte containing tetraglyme–Li-TFSA
equimolar complexes”, Solid State Ionics 262 (2014) 765-768.
Atsushi Unemoto, Hideyuki Ogawa, Yoshiyuki gambe, Itaru Honma, “Development of lithium-sulfur
battery using room temperature ionic liquid-based quasi-solid-state electrolytes”, Electrochim. Acta 125
(2014) 386-394.
2014 AIMR Tohoku University-NCTU Joint Workshop
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Complex Hydrides for Electrochemical Energy Storage
Atsushi UNEMOTO,1 Motoaki MATSUO,
2 Tamio IKESHOJI,
1 Shin-ichi ORIMO
1,2
1WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University
2Institute for Materials Research, Tohoku University
2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
Phone: +81-22-215-2094, Fax: +81-22-215-2091
e-mail: [email protected]
URL: www.hydrogen.imr.tohoku.ac.jp/en/index.html
Abstract
In the field of battery research, enhancement of the energy density of the rechargeable battery is one of
the important technological challenges that need to be addressed for large-scale applications including
automotive applications and stationary uses for load leveling. Therefore, all-solid-state lithium rechargeable
battery is considered as one of the next generation battery. This is because the solid-state electrolytes accept a
broader choice of the active materials for the battery assembly compared to the conventional liquid
electrolyte type battery. Hence, we can choose the electrodes that enhance the energy density for the battery
assemblies. With this background, various solid-state electrolytes including oxides and sulfides have been
developed so far, the materials that possess high lithium ionic conductivity (> 10–3 S cm–1), and
electrochemical stability in the voltage range for battery operation are limited to a few cases [1]. Therefore,
development of a new electrolyte family is highly desired.
In recent years, our research group has revealed that LiBH4 exhibits high lithium ionic conductivity
accompanied by the structure transition from orthorhombic to hexagonal systems at elevated temperatures
and around 390 K [2]. Above 390 K, LiBH4 exhibits the fast lithium ionic conductivity that exceeds 2 × 10–3
S cm–1, and high electrochemical stabilities [3]. Therefore, the complex hydrides are expected to be a new
solid-state electrolyte family for rechargeable batteries [4]. In this study, we incorporated the LiBH4
electrolyte in the bulk-type all-solid-state lithium rechargeable battery. TiS2 and Li were used as a positive
electrode and a negative electrode, respectively, and the discharge–charge performance was evaluated at 393
K and 0.1 C. The redox couple, TiS2/Li, is estimated to have a theoretical capacity of 239 mAh g–1
accompanied by the composition variation, LixTiS2 (0 ≤ x ≤ 1) [5]. Our battery exhibited a high initial
discharge capacity of 200 mAh g–1, corresponding to 80 % of a TiS2 utilization ratio. Discharge–charge could
be repeated stably at least for 50 times with nearly 100 % coulombic efficiency, and without capacity fading.
The result implies that the complex hydride electrolytes are promising candidate materials for the bulk-type
all-solid-state rechargeable battery assembly.
Valuable collaboration and communication with G. Nogami, M. Tazawa, and Dr. M. Taniguchi of
Mitsubishi Gas Chemicals Co., Ltd. are highly appreciated. This work was supported by the Target Project 4
of WPI-AIMR, Tohoku University, the Integrated Materials Research Center for the Low-Carbon Society
(LC-IMR), Tohoku University, JSPS KAKENHI Grant No. 25220911, and the Advanced Low Carbon
Technology Research and Development Program (ALCA) from the Japan Science and Technology Agency
(JST).
[1] N. Kamaya et al., Nat. Mater. 10 (2011) 682. [2] M. Matsuo et al., Appl. Phys. Lett. 91 (2007) 224103. [3]
M. Matsuo, S. Orimo, Adv. Energ. Mater. 1 (2011) 161. [4] A. Unemoto, M. Matsuo, S. Orimo, Adv. Funct.
Mater. 24 (2014) 2267; ChemInform 24 (2014) 29. [5] M. S. Whittingham, Science 192 (1976) 1126.
2014 AIMR Tohoku University-NCTU Joint Workshop
14
Natsuhiko YOSHINAGA
Affiliation:WPI Advanced Institute for Materials Research
(WPI-AIMR), Tohoku University
Address: Katahira 2-1-1, Aoba-Ku, Sendai 9808577, Japan
1. Education
2002 B.S. in Physicss, Kyoto University
2004 M.S. in Physics, Kyoto University
2007 Ph.D. in Physics, Kyoto University
2. Professional Experiences
2004 – 2007 JSPS Research Frllow (DC1) in Graduate School of Science, Kyoto University
2005 – 2006 Visiting fellow in Département de recherche fondamentale sur la matière condensée
(DRFMC), CEA-Grenoble , France
2007 – 2010 JSPS Research Fellow (PD) in Graduate School of Science, The University of
Tokyo
2007 – 2008 Visiting fellow in PhysicoChimie Curie UMR 168, Institut Curie, Section recherche,
France
2010 – 2011 Research Fellow in Fukui Institute for Fundamental Chemistry, Kyoto University
2011 – present Assistant Professor in Mathematics Unit, WPI-AIMR, Tohoku University
3. Scientific Interests:
Theory of Active Soft Materials, Nonlinear and Nonequilibrium Dynamics
4. Major Awards and Honors
5. Recent papers :(5 papers)
Natsuhiko Yoshinaga, "Spontaneous motion and deformation of a self-propelled droplets", Physical
Review E, 89, 012913 (2014).
Ken H. Nagai, Fumi Takabatake, Yutaka Sumino, Hiroyuki Kitahata, Masatoshi Ichikawa, and
Natsuhiko Yoshinaga, "Rotational motion of a droplet induced by interfacial tension", Physical
Review E, 87, 013009 (2013).
Natsuhiko Yoshinaga, Ken H. Nagai, Yutaka Sumino, and Hiroyuki Kitahata, "Drift instability in the
motion of a fluid droplet with a chemically reactive surface driven by Marangoni flow", Physical
Review E, 86, 016108 (2012).
Natsuhiko Yoshinaga and Philippe Marcq, "Contraction of cross-linked actomyosin bundles",
Physical Biology, 9, 046004 (2012).
Shunsuke Yabunaka, Takao Ohta, and Natsuhiko Yoshinaga, "Self-propelled motion of a fluid droplet
under chemical reaction", Journal of Chemical Physics, 136, 074904 (2012).
2014 AIMR Tohoku University-NCTU Joint Workshop
15
Motion and Shape of Drops in Active Soft Materials
Natsuhiko YOSHINAGA
WPI Advanced Institute for Materials Research (WPI-AIMR), Tohoku University
Katahira 2-1-1, Aoba-Ku, Sendai 9808577, Japan
Phone: +81-22-217-6334, Fax: +81-22-217- 6335
e-mail: [email protected]
URL: http://www.wpi-aimr.tohoku.ac.jp/~yoshinaga/
Abstract
Spontaneous motion has attracted lots of attention in the last decades in nonlinear and nonequilibrium
physics partially for its potential application to biological problems such as cell motility. Recently, several
model experiments showing spontaneous motion have been proposed in order to elucidate underlying
mechanism of the motion. The systems in these works consist of relatively simple ingredients, for instance,
oil droplets in water, but nevertheless the results show rich motion and deformation of the droplet.
Importantly, the system breaks symmetry and chooses one direction of motion.
In this presentation, we theoretically show a set of nonlinear equations exhibiting a transition between
stationary and motile states starting from the nonlinear advection-reaction-diffusion equation driven away
from an equilibrium state due to chemical reactions. A particular focus is on how hydrodynamic flow
destabilizes an isotropic distribution of a concentration of chemicals. We also discuss a shape of the droplet.
Due to self-propulsive motion and flow around the droplet, a spherical shape becomes unstable and it
elongates perpendicular to the direction of motion. This fact implies that the self-propulsion driven by
chemical reaction is characterized as a pusher in terms of a flow field.
Fig. Motion and deformation of pusher (a) and puller (b). Under the given distribution of the surface tension, the flow field, the direction of the force dipole, and the force acting on the surface of a droplet are drawn depending on the sign of the second mode of the surface tension.
(a) (b)
2014 AIMR Tohoku University-NCTU Joint Workshop
16
Jong JUANG
Affiliation (Times New Roman, 10pt)
Address (Times New Roman, 10pt)
1. Education
Texas Tech University, 1987
2. Professional Experiences
Department of Applied Math., National Chiao Tung University
Professor (1995/08~)
Chairman (1997/08~1999/07)
Associate Dean of College of Science (2006/08~2007/08)
Distinguished Professor (2010/08~)
3. Scientific Interests:
Differential Equations and Dynamical Systems
Major Awards and Honors
4. Recent papers :(5 papers)
J. Juang & Y.–H. Liang, Synchronous Chaos in Coupled Map Lattices with General Connectivity
Topology, SIAM Appl. Dynan. Syst., 7 (2008), no. 3, 755--765.
Y.-C. Chang and J. Juang, Stable Synchrong In Globally-Coupled Integrate-And-Fire Oscillators,
SIAM Appl. Dynam. Systems. Vol. 7, issue 4, PP. 1445-1476.
C. Juang, C.-L. Li, Y.-H. Liang and J. Juang, Wavelet Transform Method for Coupled Map Lattices,
IEEE Transactions on CAS I, Vol. 56, No. 4, PP. 840-845, April (2009).
F.-J. Jhou, J. Juang and Y.-H. Liang, Multi-state and multi-state synchronization of Hindmarsh-Rose
neurons with chemical and electrical synapses, IEEE Transactions on CAS-I: Regular paper, Vol. 59,
No.6, 1355-1349, 2012.
J. Juang and Y-H Liang, Cluster synchrongation in Networks of Neurons with Chemical Synapses,
Chaos 24, 013110 (2014)
2014 AIMR Tohoku University-NCTU Joint Workshop
17
Dynamics on the Network of Hindmarsh-Rose Neurons
Jong Juang
Department of Applied Mathematics, National Chiao-Tung University
1001 University Road, Hsinchu 300, Taiwan
Phone: +886-3-5712121 Ext. 31208
e-mail:[email protected]
Abstract
We will talk about the synchronized dynamics on the coupled Hindmarish-Rose nearons as well as the
dynamics of its synchronous equations.
2014 AIMR Tohoku University-NCTU Joint Workshop
18
Miki U. KOBAYASHI
Affiliation:Tohoku University, WPI-AIMR
Address: 2-1-1 Katahira Aoba-ku Sendai, 980-8577, Japan
Education
2008 Ph.D. (Informatics) Graduate School of Informatics, Kyoto University
Professional Experiences
2012- Tohoku University WPI-AIMR
Scientific Interests:
Control theory for materials
Nonlinear dynamical systems
Major Awards and Honors
Recent papers :(5 papers)
(1)“Manifold structures of unstable periodic orbits and the appearance of periodic windows in chaotic
systems”, M.U.Kobayashi and Y.Saiki, PRE 89, 022904 (2014).
(2)“Dispersion of nanoparticles with control theory”, M.U.Kobayashi, Proc. of KJCCS (2013).
(3)”Temporal intermittency in a shell model turbulence in terms of covariant Lyapunov vectors”,
M.U.Kobayashi and M.Yamada, J. Phys. A: Math. Theor. , 46, 254008 (2013).
(4)“Delayed feedback control method for dynamical systems with chaotic saddles”, M.U.Kobayashi
and K.Aihara, AIP Conf. Proc. 1468, 207 (2012).
(5)”Covariant Lyapunov analysis of chaotic Kolmogorov flows”, M. Inubushi, M.U.Kobayashi, S-I.
Takehiro, and M.Yamada, PRE, 85, 016331 (2012).
2014 AIMR Tohoku University-NCTU Joint Workshop
19
Controlling of particles with fluctuations
- Toward applications of nano-devices -
Miki U. KOBAYASHI
Tohoku University, WPI-AIMR
2-1-1 Katahira Aoba-ku Sendai, 980-8577, Japan
Phone: +81-22-217-6149
e-mail: [email protected]
Abstract
We construct control theory for dynamics of particles with fluctuations. This theory is based on the time
delayed feedback control method which is a kind of chaos control. One of the aims of chaos control is to
control a chaotic irregular motion to be a regular one. On the other hand, our aim is to suppress fluctuations
of stochastic motion. We investigate theoretically an effect of the control theory on random walk and find
that the diffusion coefficient of the controlled system is strongly suppressed with increasing time delay in the
control input.
Furthermore, we make a mathematical model for a nano-device which is represented mathematically
based on dynamics of electron with fluctuations due to the tunnel effect. According to the model, the output
voltage of the device fluctuates stochastically. In order to improve the performance of the nano-device, the
fluctuations should be suppressed. We apply numerically the control theory to the mathematical model on
the nano-device. As the results, the fluctuations are suppressed by control inputs based on the control theory,
implying that the control theory is useful to improve the performance of the nano-device practically.
2014 AIMR Tohoku University-NCTU Joint Workshop
20
TE-SHENG LIN
Affiliation:Department of Applied Mathematics, National Chiao
Tung University
Address: 1001 Ta Hseuh Road, Hsinchu 300, Taiwan
1. Education
Department of Mathematical Sciences, New Jersey Institute of Technology, USA, 05/2012
2. Professional Experiences
Research Associate, Department of Mathematical Sciences, Loughborough University, UK, 12/2012
– 07/2014
Marie Curie Experienced Researcher, Department of Mathematical Sciences, Loughborough
University, UK, 06/2012 -12/2012
3. Scientific Interests:
Mathematical modeling ; Scientific computation ; Fluid mechanics.
4. Major Awards and Honors
5. Recent papers :(5 papers)
1. T.-S. Lin, L. J. Cummings, A. J. Archer, L. Kondic and U. Thiele, Note on the hydrodynamic
description of thin nematic films: strong anchoring model, Phys. Fluids, 25, 082102 (2013).
2. T.-S. Lin, L. Kondic, U. Thiele and L. J. Cummings, Modelling spreading dynamics of nematic
liquid crystals in three spatial dimensions, J. Fluid Mech., 729, 214 (2013).
3. T.-S. Lin, L. Kondic and A. Filippov, Thin films flowing down inverted substrates: three
dimensional flow, Phys. Fluids, 24, 022105 (2012).
4. L. J. Cummings, T.-S. Lin and L. Kondic, Modelling and simulations of the spreading and
destabilization of nematic droplets, Phys. Fluids, 23, 043102 (2011).
5. T.-S. Lin and L. Kondic, Thin films flowing down inverted substrates: two dimensional flow,
Phys. Fluids, 22, 052105 (2010).
2014 AIMR Tohoku University-NCTU Joint Workshop
21
Weak Interaction of Solitary Pulses in Thin Liquid Films
TE-SHENG LIN
Department of Applied Mathematics, NCTU
1001 Ta Hsueh Road, Hsinchu 300, Taiwan
Phone: +886-3-5712121 ext:56422, Fax: +886-3-5724679
e-mail: [email protected] URL:http://www.math.nctu.edu.tw/~tslin
Abstract
We analyze pulse interaction in active-dissipative systems that arise in the study of falling liquid films in
the presence of various external effects, e.g. an applied electric field or turbulent gas flow. Such effects result
in additional non-local terms in the form of pseudo-differential operators. We analyze both weakly nonlinear
and fully nonlinear reduced model equations. We develop an accurate weak-interaction theory for the pulses
that allows us to analyze the attraction and repulsion of pulses and the existence of bound states. We compare
the theoretical predictions with numerical results for reduced model equations and Stokes flow. It is found
that non-locality strongly influences pulse interactions and results in several features that are not present in
local equations.
2014 AIMR Tohoku University-NCTU Joint Workshop
22
Daniel PACKWOOD
Affiliation:WPI-Advanced Institute for Materials Research,
Tohoku University
Address: 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
1. Education
Bachelor of Science (Honours 1) (2008, University of Canterbury)
Doctor of Philosophy (2010, University of Canterbury)
2. Professional Experiences
Postdoctoral Fellow, Department of Chemistry, Graduate School of Science, Kyoto University (2010
– 2012)
Assistant Professor, WPI-Advanced Institute for Materials Research, Tohoku University (2012 –
present)
3. Scientific Interests:
Stochastic modelling and probability applied to chemical physics.
4. Major Awards and Honors
New Zealand Tertiary Education Commission Top Achiever Doctoral Scholarship (2008)
Japan Society for the Promotion of Science Postdoctoral Fellowship (2010)
5. Recent papers :(5 papers)
D. M. Packwood, T. Jin, T. Fijita, M. W. Chen, and N. Asao. Mixing Time of Molecules Inside of
Nanoporous Gold. SIAM Journal on Applied Mathematics In press (2014).
D. M. Packwood, K. T. Reaves, F. L. Federici, H. G. Katzgraber, and W. Teizer. 2D Molecular
Magnets with Weak Topological Invariant Magnetic Moments : Mathematical Prediction of Targets
for Chemical Synthesis. Proceedings of the Royal Society A 469, 2013, 20130373
D. M. Packwood, S. Shiraki, and T. Hitosugi. Effects of Collisions on the Stoichiometry of Thin
Films Prepared by Pulsed Laser Deposition. Physical Review Letters 111, 2013, 036101.
D. M. Packwood and Y. Tanimura. Dephasing by a Continuous-Time Random Walk Process.
Physical Review E 86, 2012, 11130.
D. M. Packwood and L. F. Phillips. A Stochastic, Local Mode Study of Neon-Liquid Surface
Collision Dynamics. Physical Chemistry Chemial Physics 13, 2011, 762.
2014 AIMR Tohoku University-NCTU Joint Workshop
23
Charge Transport Inside of Organic Crystals:
The Crucial Role of Correlated Fluctuations
Daniel M. PACKWOOD
WPI-Advanced Institute for Materials Research, Tohoku University
2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
Phone: +81-22-217-6149, Fax: +81-22-217-6149
e-mail: [email protected] URL: http://packwood.web.fc2.com
Abstract
A major goal in organic semiconductor research is to fabricate crystals of organic molecules with high
charge carrier mobilities. However, progress in this direction has been difficult due to a lack of understanding
of the charge transport mechanism in these materials. Electron and hole mobilities in organic crystals are
known to decrease with increasing temperature, which is suggestive of delocalised band-type transport seen
in metallic conductors. However, other experiments have shown that the charge carriers are actually localised
over several molecules. Several first-principles calculations have shown that these phenomena are related to
the random thermal motions of molecules in the crystal [1], however these calculations have not explained
how this dynamical disorder gives rise to these unique electrical properties.
We have been studying the dynamics of charges over a network of molecules via a stochastic
tight-binding model. In this model, the dynamical disorder in a real organic crystal is modelled by Gaussian
stochastic modulation of the electronic coupling between molecules. Simulation of this model gives a
mobility-temperature dependence that is in qualitative agreement with experimental data. In order to
understand the mechanism of charge transport in this model, we performed a novel mathematical analysis
based on time-dependent perturbation theory. We find that the charge transport dynamics in this model can be
regarded as a sum of ‘highly correlated paths’, i.e., virtual processes in which the charge is transported over
regions where the stochastic modulations are highly correlated. As temperature increases, the correlation
function for these stochastic fluctuations decays more rapidly, and this phenomenon turns out to be closely
related to the decay of mobility with increasing temperature. On the other hand, such ‘highly correlated paths’
are tightly localised in space, because highly correlated fluctuations cannot persist over a long distance. This
analysis therefore suggests the possible crucial role of correlated thermal fluctuation in the charge transport
regime of real organic crystals [2].
[1] A. Troisi and G. Orlandi. J. Phys. Chem. A. 110, 4065 (2006) ; H. Tamura et al. Phys. Rev. B. 86,
035208, 2012.
[2] D. M. Packwood, in preparation (2014).
2014 AIMR Tohoku University-NCTU Joint Workshop
24
Chin-Tien Wu
1. Education
PhD. Applied Mathematics and Scientific Computation,
Univ. of Maryland, College Park, MD, USA
2. Professional Experiences
Associated professor, National Chiao-Tung University, Taiwan, 2012~present
Assistant professor, National Chiao-Tung University, Taiwan, 2007~2012
Assistant professor, National Taiwan Ocean university, Taiwan, 2006~2007
Visiting professor, National Chiao-Tung University, Taiwan, 2005~2006
Post doctor : National center of theoretical science, Taiwan, 2004~2005
3. Scientific Interests:
Numerical linear algebra, finite element method, computational mechanics, image processing
4. Major Awards and Honors
5. Recent papers :
1. Yu-Lin Tsai, Ming-Chen Chiang, Ray Chang, Chung-Hao Tien, Chin-Tien Wu, A new
approach to construct freeform surface by numerically differential formulation. Optical
Engineering, 2013.
2. Tsung-Ming Hwang, Wen-Wei Lin and Chin-Tien Wu, Structure-Preserving Arnoldi-Type
Algorithm for Solving Eigenvalue Problems in Leaky Surface Wave Propagation , Applied
Mathematics and Computation , 2013.
3. Tsung-Ming Huang; Tiexiang Li; Wen-Wei Lin, Chin-Tien Wu , Numerical Studies on
Structure-Preserving Algorithms for Surface Acoustic Wave Simulations. Journal of
computational and applied mathematics, 2012.
4. Chin-Tien Wu, Ming-Chih Lai and Zhilin Li, Adaptive mesh refinement for the elliptic
interface problems using immersed finite element method. Journal of international numerical
analysis and modeling, 2011.
5. Z. T. Huang, H. C. Hsu, C. L. Chang, C. T. Wu and T. F. Jiang, Momentum-time flux
conservation method for one-dimensional wave equations. Computer Physics Communications,
2010.
Affiliation: Applied Mathematics department ,
National Chiao-Tung University
Address : 1001 University Road, Hsinchu, Taiwan 300, ROC
2014 AIMR Tohoku University-NCTU Joint Workshop
25
A Reconstruction Algorithm for Free Form Lens Designs
Chin-Tien Wu
Department of Applied Mathematics, Chiao-Tung University
1001 University Road, Hsinchu, Taiwan 300, ROC
Phone: +886-3-5712121, Fax: +886-3-5722088
e-mail:[email protected]
Abstract.
The model of reflection and refraction free-form design problem is based on energy conservation and
results in a fully nonlinear partial differential equation. The equation is the Monge-Ampere type PDE (MA)
also arising in various research fields such as differential geometry, mass transportation, geostrophic fluid
and optical design problem. Existence and regualrity have been shown by Caffarelli, Oliker, Mader and
Wang etc. Numerical methods such as finite difference methods proposed by Oberman etc, Dean and
Glowinshi, and finite element methods proposed by Feng and Neilan and Awanou have been successfully
applied to solve the standard MA equation. For geometrical optical design, freeform reconstruction and
design methods have been proposed by Minano, Benitez, Neubauer and Oliker, etc.
In this paper, We proposed a new design method for single freeform reflective (or refractive) surface
tailored to redistribute the radiant flux onto a prescribed illumination pattern. The freeform surface is
assumed to be very flat and smooth in Lagrangian local coordinates. To fulfill this assumption, we follow
Neubauer’s idea and Parkyn’s equi-flux map. As a result, the energy transfer between the light source and the
target illuminance is then localized to each corresponding grid cell. Then, a freeform can be constructed by
solving a reduced MA equation on each local domain. We solve the reduced MA equation by Feng and
Neilan’s vanished moment method using well-known HCT finite element. Several numerical tests are
presented to demonstrate the accuracy and robustness of our algorithm. Both freeform designs for uniform
and non-uniform illumination over planar and non-planar target domains are shown in our tests.
2014 AIMR Tohoku University-NCTU Joint Workshop
26
Chihiro NAKAJIMA
Affiliation:WPI-AIMR, Tohoku University
Address:2-1-1, Katahira, Aoba-ku, Sendai, Miyagi, 980-8577,
Japan
1. Education
Ph. D of Arts and Sciences, University of Tokyo, Japan (2009)
2. Professional Experiences
2010-2013 Postdoc, Department of Physics, Kyushu University, Japan
2013-present Assistant Professor, WPI-AIMR, Tohoku University, Japan
3. Scientific Interests:
Statistical mechanics, Computational complexity, knot theory, information theory, polymer physics
4. Major Awards and Honors
5. Recent papers :(5 papers)
1. C. H. Nakajima, Interdisciplinary Information Science 19, 51-56 (2013)
2. C. H. Nakajima and T. Sakaue, Soft Matter 9, 3140-3146 (2013)
3. C. H. Nakajima and T. Sakaue, J. Phys. Soc. Jpn. 81, 035001 (2012)
4. C. H. Nakajima and T. Sakaue, Prog. Theor. Phys. Suppl. 191, 205-209 (2011)
5. C. H. Nakajima and K. Hukushima, Phys. Rev. E 78, 041132 (2008)
2014 AIMR Tohoku University-NCTU Joint Workshop
27
Statistical mechanics reconstruction of the structure of gold
nano-cluster
Chihiro NAKAJIMA
Affiliation WPI-AIMR, Tohoku University
Address 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan
Phone: +81 22 217 6149
e-mail: [email protected]
Abstract
Recently, with a help of a discrete tomography transmission electron microscopy, it is possible to obtain a
resolution of an atomic scale the two-dimensional projection view of the nanocrystals. With the context of the
nanoscale experimental data processing, we are developing the method to reconstruct a three-dimensional
arrangement of atoms in a nanocrystal, especially focusing on its surface roughness and the structure of pores,
by integrating a few experimental data of scattering intensity which is two-dimensional projection of stacking
atoms.
This reconstruction process is a discrete inverse problem and can be regarded as a kind of nonogram
puzzles whose computational properties are investigated. We solve the inverse problem by trying out
possible atomic arrangements which are generated probabilistically. With this approach, the problem
becomes a statistical mechanics problem of finding an optimized state while exploring the complex landscape
of the cost function. Here the exploration is dealt with by applying a replica exchange Monte Carlo method,
which has been applied successfully to spin-glass problem and several other complex optimization problems
branching from it.
In general, exponential number of three-dimensional structures still remain as candidate only with
constraint condition from experimental data. But by assuming and utilizing the sparseness to the structure, we
can narrow the candidate down to almost unique. This technique is a variation of compressed sensing. We
started from reconstructing artificial three dimensional structure to examine the validity of this method and
successfully and almost uniquely reconstructed the structure. In present we apply the method to experimental
situation; reconstructing structure of nanoporous gold from three projected data.
Statistical inference and compressed sensing is developed in various fields of neural biology, protein
structure determination, and gene expression analysis. We expect that this study becomes a first example of
successful application of the method in the field of material science.
2014 AIMR Tohoku University-NCTU Joint Workshop
28
Guan-Yu Chen
Affiliation:Department of Applied Mathematics, NCTU
1. Education
Ph.D. in Mathematics, Cornell University (2006)
2. Professional Experiences
Visiting Assistant Professor, National Center for Theoretical Science, Taiwan (2006/8 ~ 2007/7)
Assistant Professor, Dept. of Applied Mathematics, NCTU, Taiwan (2007/08 ~ 2011/7)
Associate Professor, Dept. of Applied Mathematics, NCTU, Taiwan (2011/08 ~ )
3. Scientific Interests:
Probability Theory, Stochastic Processes
4. Major Awards and Honors
Young Theorist Award of NCTS (2008)
Award for Junior Research Investigators, College of Science, NCTU (2009)
TMS Young Mathematician Award (2011)
NCTS Center Scientist (2007/8 ~ 2009/7, 2010/8 ~ 2011/7, 2013/8~2014/7)
5. Recent papers
Guan-Yu Chen and Laurent Saloff-Coste, Spectral computation for birth and death chains. Stochastic
Processes and their applications, 124 (2014), 848-882
Guan-Yu Chen and Laurent Saloff-Coste, Comparison of cutoffs between lazy walks and Markovian
semigroups. J. Appl. Probab. Volume 50, Number 4 (2013), 943-959.
Guan-Yu Chen and Laurent Saloff-Coste, On the mixing time and spectral gap for birth and death
chains. ALEA, Lat. Am. J. Probab. Math. Stat. Volume 10, Number 1 (2013), 293-321.
Guan-Yu Chen and Laurent Saloff-Coste, The L2-cutoff for reversible Markov processes. J. Funct.
Anal. 258 (2010), 2246-2315.
Guan-Yu Chen and Laurent Saloff-Coste, The cutoff phenomenon for ergodic Markov processes.
Electronic Journal of Probability, 13 (2008), 26-78.
2014 AIMR Tohoku University-NCTU Joint Workshop
29
A Random Time in Sampling One-Dimensional Distributions
Guan-Yu Chen
Department of Applied Mathematics, NCTU
Address: 1001 Ta Hsueh Road, Hsinchu 30050, Taiwan
Phone: +886-3-5712121 Ext:56421, Fax: +886-3-5724679
E-mail:[email protected]
URL: http://jupiter.math.nctu.edu.tw/~gychen/index.htm
Abstract
The Markov chain Monte Carlo (MCMC for short) method is a frequently used technique in sampling
probability distributions on graphs. There are many interdisciplinary applications including statistic physics,
computer science, biology and more. When a MCMC algorithm is implemented, the time to stop and sample
is the most important issue and the threshold time (or the mixing time) provides an answer to this question. A
quantitative estimation of the threshold time is either unavailable or very complicated even the graph has the
simplest structure, the one-dimensional path. In this talk, we will give a short introduction of the MCMC
mechanics and then go straight forward to the subject of birth and death chains. As a comparison of the
mixing time, which is a deterministic quantity, we provide a random time to halt the MCMC sampling and
make a quantitative estimation of this method.
2014 AIMR Tohoku University-NCTU Joint Workshop
30
CHUN-YEN, CHANG
Chun-Yen Chang, National Endowed Chair Professor,
President Emeritus, National Chiao Tung University
(NCTU), and National Academy of Engineering, USA.
Prof. Chun Yen Chang was born on Oct. 12th, 1937 in KaoXiong, Taiwan.
Graduated from EE department of National Cheng Kung University in 1960 with
BS degree, the electronics institute of National Chiao-Tung University in 1962
with MS degree, and in 1970 with PhD degree.
He and his Colleagues, at National Chiao-Tung University (NCTU), Taiwan, successfully fabricated the
first Si Planar Transistor in 1964(J. of Engineering, p 631, 1965), MOSFET in 1966(SSE, p441, 1969) and
LED in 1970 , which was regarded as the earliest and the foundation of Taiwan Semiconductor Research in
Taiwan.
By 1980, he and his team members helped to establish Hsinchu Science Based Industrial Park (HSBP)
under the leadership of the National Science Council of Taiwan. And helped to establishing UMC (1980),
TSMC (1987), Prime View (1998), Display (2000) etc.
In 1988, He proposed and became the founding director of the National Nano-Device Laboratories in
Taiwan (NDL).
In 2001, he proposed and founded the National SOC/SIP Program (2001-2005), in order to promote the
national competitiveness of system on chip design capabilities. This program has attracted and recruited
340 world classexperts. The impact was reflected by the number of papers contributed from Taiwan in
ISSCC was from nothing to No.3 in the world since 2004 (No.2 in VLSI –circuits –Kyoto 2013)
Recently, he and his group worked on the sub 10nmfinfets, 2nm quantum sheet gate all around (GAA)
junction-less transistors, in which, an excellent SS of 60 mV/dec was achieved. (VLSI, technology, 2013,
Kyoto).
His academic achievements include: 1."quantum transport in superconductor-semiconductor interface"
in 1960. 2. “Carrier transport in metal -semiconductor barrier" (Solid State Electronics, p727, 1970).
3.”Specific Contact Resistance in metal-semiconductor "(Solid State Electronics, p525, 1971) 4. Invented
"the method of Low Pressure MOCVD by using tri-ethyl Ga"(Journal of Crystal Growth, V. 55,
No.1,p24.,1981) etc.
He was elected the academician of Academia Sinica, in 1996. The foreign associate, National Academy
of Engineering USA, in 2000. The Japan Nikkei Asia Award in Science in 2007. He has been the MTS of
Bell Telephone Laboratories, in 1981, and the visiting professor at U. Florida (1987), Stuttgart U. (1990,
1993, 1996).
He became full professor at NCTU (1969), Dean of Engineering NCTU (1990), founding president of
NDL (1990-1996).president of NCTU (1998-2006). He is now the Life-Long National Endowed Chair
Professor of the Nation and at NCTU.
2014 AIMR Tohoku University-NCTU Joint Workshop
31
FUTURE JAPAN AND TAIWAN
Chun Yen Chang
Department of Electrical and Computer Engineering,
National Chiao Tung University
1001 UniversityRd. Hsinchu 30010 Taiwan
Phone: +886-3-5712121-52981
e-mail: [email protected]
Abstract
This talk is essentially an active education of several things. First, though demonstrations of
green-energy-efficient 2nm Si-FINFET, followed by thousand-volt, huge-energy-efficient HEMT devices, I
will arrive with that in 21st century, the MOSTS of strategic R&D are focusing on medicine, energy- storage,
and human-touch enterprises. In order to the strategic corporations for Taiwan and Japan, big ideas, big
people, and big money are essential. The BEST is for yourself; the GOOD is for mankind!
2014 AIMR Tohoku University-NCTU Joint Workshop
32
Seiji SAMUKAWA
Affiliation:Advanced Institute of Materials Research
and Instutute of Fluid Science、Tohoku University
Address: 2-1-1 Katahira Aoba-ku Sendai, Miyagi 980-8577, Japan
1. Education
Keio University B.S. 1981 Instrumentation Engineering
Keio University Ph.D 1992 Instrumentation Engineering
2. Professional Experiences
1989-2000 :Principal Researcher, R&D Group, NEC Corporation
2000-presen :Professor, Institute of Fluid Science, Tohoku University
2007- present :Director of nano-micro cluster of Institute of Fluid Science, Tohoku University
2008- 2014 :Distinguished Professor in Tohoku University
2013-:Director of Innovative Energy Research Center of Institute of Fluid Science, Tohoku
University, Director of Core Technology Consortium for Advanced Energy Devices, Tohoku
University
3. Scientific Interests
Ultimate To-down Professor for Nano-scale Devices
4. Major Awards and Honors
2008 :Ichimura Award in the New Technology Development Foundation,
2009 : Prizes for Science and Technology: The Commendation for Science and Technology by the
Minister of Education, Culture, Sports, Science and Technology,
2010 :Plasma Prize in American Vacuum Society.
5. Recent papers :(5 papers)
1.Y. Kikuchi, A. Wada, T. Kurotori, M. Nakano, K. Y. Inoue, T. Matsue, T. Nozawa, and S.
Samukawa, Conductive amorphous hydrocarbon film for Bio-sensor formed by low temperature
neutral beam enhanced chemical vapor deposition, Carbon, Vol. 67 (2014) pp. 635-642.
2. C. Thomas, Y. Tamura, T. Okada, A. Higo and S. Samukawa, Estimation of activation energy and
surface reaction mechanism of chlorine neutral beam etching of GaAs for nanostructure fabrication,
Journal of Physics D: Applied Physics, Vol. 47 (2014) pp. 275201.
3. X. Gu, Y. Kikuchi, T. Nozawa, and S. Samukawa, A new metalic complex reaction etching for
transition metals by a low-temperature neutral beam process, Journal of Physics D: Applied Physics,
Vol. 47 (2014) pp. 322002 (4pp).
4.C.-H. Huang, C.-Y. Su, T. Okada, L-J Li, K-I Ho, P-W Li, I-H Chen, C. Chou, Chao-Sung Lai, and
Seiji Samukawa, Ultra-low-edge-defect graphene nanoribbons patterned by neutral beam, Carbon,
Vol. 61 (2013) pp. 229-235.
5. Y. Tamura, T. Kaizu, T. Kiba, M. Igarashi, R. Tsukamoto, A. Higo, W. Hu, C. Thomas, M. E.
Fauzi, T. Hoshii, I. Yamashita, Y. Okada, A. Murayama and S. Samukawa, Quantum size effects in
GaAs nanodisks fabricated using a combination of the bio-template technique and neutral beam
etching, Nanotechnology, Vol. 24 (2013) pp. 285301.
2014 AIMR Tohoku University-NCTU Joint Workshop
33
Neutral Beam Technology
–Defect-free Nanofabrication for Novel Nano-materials and Nano-devices-
Seiji SAMUKAWA
Advanced Institute for Materials Research &
Innovative Energy Research Center, Institute of Fluid Science, Tohoku University
2-1-1 Katahira Aoba-ku Sendai, Miyagi 980-8577, Japan
Phone: +81-22-217-5240, Fax: +81-22-217-5240
e-mail:[email protected],
URL:http://www.ifs.tohoku.ac.jp/samukawa/index.htm
Abstract
In this paper, I introduce the ultimate nanofabrication processes using neutral-beam sources and discuss
the fusion of top-down and bottom-up processing for future nanoscale devices. To achieve charge-free and
UV photon irradiation damage-free processes, we have developed a new neutral beam generation system
based on my discovery that neutral beams can be efficiently generated from the acceleration of negative ions
produced in pulsed plasmas. Using the neutral beam processing, we successfully demonstrated sub-50nm
damage-free gate electrode etching, damage-free Si channel etching for 45 nm fin-FETs, ultra-thin gate
dielectric film formation for 32 nm fin-FETs, damage-free low dielectric film deposition for 22 nm FETs, and
low-damage surface modification of carbon materials (including nanotubes, graphenes and organic
moleculers) for future nanodevices. More recently we have investigated processing technologies based on the
combination of biotechnology with neutral-beam-based nano-processes, i.e., bio-nano processes, for future
nanoelectronics devices and successfully achieved the fabrication of sub-10-nm-diameter and high density Si,
Ge, GaAs, InGaAs and Graphene nanodisk (nanodot) array structures. The quantum effects of these
nano-scaled structures were shown to manifest themselves at room temperature due to the damage-free
surfaces made possible by the neutral beam processes. Now, by using these nanodisk structures, we are
actively developing “Novel Quantum Effect Devices”, such as quantum dot solar cell for high energy
conversion efficiency of more than 45% and quantum dot laser.
We are actively developing ultra-low-damage nanofabrication techniques using neutral beam technology
that tap into the essential nature of nano-materials and nano-structures, and developing innovative
nanodevices.
2014 AIMR Tohoku University-NCTU Joint Workshop
34
Pu-Wei Wu
Affiliation:Department of Materials Science and Engineering
National Chiao Tung University
Address:1001 University Road, Hsin-Chu, Taiwan 300, R.O.C.
1. Education
BS. Department of Materials Science and Engineering
National Tsing Hua University (1992)
Ph.D. Department of Materials Science and Engineering, UCLA (1999)
2. Professional Experiences
Assosist Professor, NCTU 2005-2008
Associate Professor, NCTU 2008-2011
Professor, NCTU 2011-
V. Chair, MSE Dept. 2014-
3. Scientific Interests
Electrocatalysts for Fuel Cell Applications
Colloidal Crystals and Inverse Opals for Engineering Applications
4. Major Awards and Honors
5. Recent papers :(5 papers)
1.Huang et al., *,”Structural Characterization of Colloidal Crystals and Inverse Opals Using
Transmission X-ray Microscopy”, Journal of Colloid and Interface Science, vol.426, p. 199-205
(2014).
2.Lee et al., ”Dealloyed Pt2Os Nanoparticles for Enhanced Oxygen Reduction Reaction in Acidic
Electrolytes”, Applied Catalysis B: Environmental, vol. 150-151, p. 636-646 (2014).
3.Hsieh et al., “Using Decomposed Nation Ionomers to Anchor Pt Nanoparticles and Improve Their
Durability during Methanol Electro-oxidation”, Journal of Power Sources, vol. 245, p. 315-323
(2014).
4.Kuo et al., “Surface Modification of Commercial PtRu Nanoparticles for Methanol
Electro-oxidation”, Journal of Power Sources, vol. 240, p. 122-130 (2013).
5.Chang et al., “Synthesis of Large Surface Area Carbon Xerogels for Electrochemical Double Layer
Capacitors”, Journal of Power Sources, vol. 223, p. 147-154 (2013).
2014 AIMR Tohoku University-NCTU Joint Workshop
35
Synthesis and Characterization of Nanostructured
Electrocatalysts for Fuel Cell Applications
Pu-Wei Wu
Department of Materials Science and Engineering, National Chiao Tung University
1001 University Road, Hsin-Chu, Taiwan R.O.C.
Phone: +886-3-5131227, Fax: +886-3-5724727
e-mail: [email protected] http://web.it.nctu.edu.tw/~amet/
Abstract
Electrocatalysis is an interfacial phenomenon that has significant impacts in fuel cell applications. In this
presentation, we showcase our research efforts in the synthesis and fabrication of tailored-made
nanoparticles with desirable surface structure/composition for comparable or even better electrocatalytic
activities than that of commercially available Pt nanoparticles. The surface modification schemes we adopt
include galvanic displacement reaction and Cu under-potential deposition that enable the formation of
monolayered deposit atop an alloyed nanoparticle. In addition, we present our recent activities in carbon
surface functionalization via intentional decompositon of Nafion ionomers. The breakdown of Nafion
ionomers engenders hydrophilic moieties that attaches to the carbons for better wetting and greater
adsorption of ions from the electrolyte.
2014 AIMR Tohoku University-NCTU Joint Workshop
36
Kumi INOUE
Affiliation:Graduate School of Environmental Studies,
Tohoku University,
Address: 6-6-11 Aramaki-Aza-Aoba Aoba-ku, Sendai 980-8579,
Japan
1. Education
2007.10-2010.8 Ph.D Course in Environmental Chemistry, Tohoku University
Obtained degree: Doctor of Philosophy
1991.4-1995.3 Department of Agricultural Chemistry, Kyoto University
2. Professional Experiences
2014.4-Present Lecture in Graduate School of Environmental Studies, Tohoku University
2013.4-2014.3 Assistant Professor in Micro System Integration Center, Tohoku University
2011.4-Present Part-time Lecturer in Tohoku Institute of Technology
2010.4-2012.3 Research Fellow in Micro System Integration Center, Tohoku University
2005.2-2010.4 Assistant Researcher in Graduate School of Environmental Studies, Tohoku
University
2002.4-2005.2 Supervisory Researcher in Miyagi Miso & Soy Sauce Cooperative Association
1995.11-2002.4 Researcher in Miyagi Miso & Soy Sauce Cooperative Association
3. Scientific Interests:
Electrochemical sensor array for biological imagings
Miniaturized biosensors for point of care testings
4. Major Awards and Honors
2013.3 Excellent Woman Researcher Award of The Electrochemical Society of Japan
2011.11 ACCS Best Paper Presentation award in the 9th Asian Conference on Chemical Sensors
5. Recent papers :(5 papers)
S. Takano, S. Shiomoto, K. Y. Inoue, K. Ino, H. Shiku, T. Matsue. Electrochemical approach for
development of a simple method to detect the cell apoptosis based on caspase-3 activity. Anal. Chem.,
86 (2014) 4723–4728.
Y. Kikuchi, A. Wada, T. Kurotori, M. Nakano, K. Y. Inoue, T. Matsue, T. Nozawa, S. Samukawa.
Conductive amorphous hydrocarbon working as electrode formed by neutral beam enhanced chemical
vapor deposition below room temperature. Carbon, 67 (2014) 635-642.
K. Y. Inoue, S. Takano, S. Takahashi, Y.e Ishida, K. Ino, H.i Shiku, T. Matsue. Screen-printed
endotoxin sensor based on amperometry using novel p-aminophenol conjugated substrate for Limulus
amebocyte lysate protease reaction. Analyst, 138 (2013) 6523-6531.
M. Sen, K. Ino, K. Y. Inoue, T. Arai, T. Nishijo, A. Suda, R. Kunikata, H. Shiku, T. Matsue.
LSI-based amperometric sensor for real-time monitoring of embryoid bodies. Biosens. Bioelectron.
48 (2013) 12-18.
K. Y. Inoue, M. Matsudaira, R. Kubo, M.i Nakano, S. Yoshida, S. Matsuzaki, A. Suda, R. Kunikata,
T. Kimura, R. Tsurumi, T. Shioya, K. Ino, H. Shiku, S. Satoh, M. Esashi, T. Matsue. LSI-based
Amperometric Sensor for Bio-imaging and Multi-point Biosensing. Lab Chip 12 (2012) 3481-3490.
2014 AIMR Tohoku University-NCTU Joint Workshop
37
Biosensing and Bioimaging with Integrated Electrochemical
Sensor Arrays
Kumi INOUE,* Tomokazu MATSUE
Graduate School of Environmental Studies, Tohoku University
6-6-11 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8579, Japan
Phone: + 81-22-795-6167, Fax: 81-22-795-6167
e-mail: [email protected]
URL: http://www.che.tohoku.ac.jp/~bioinfo/
Abstract
We have developed LSI-based amperometric sensor arrays called “Bio-LSI” (Fig. A-D). Amperometry is often used for
electrochemical biosensing including self blood glucose measurement because of its quantitativity, highly sensitivity and usability.
With an integration of 400 amperometic sensors into a 5 mm×5 mm area on LSI, we successfully realized Bio-LSI as a
world-leading platform for electrochemical bio-imaging and multi-point biosensing. Our Bio-LSI has a wide dynamic range from
±1 pA to ±100 nA with a spacial resolution of 250 μm and a temporal resolution of 18-125 ms/400 points.1) We made some
demonstration of bio-imaging with Bio-LSI including flow of biochemical spieces,1) enzyme activities (Fig. E),1) cell respiration
activities2), cell differentiation markers2,3) (Fig. F) and movement of microbes (Fig. G). We also developed an improved version of
Bio-LSI (2G-Bio-LSI) with 4-mode selectable function (off, electrometer, V1 and V2), in order to enable complex measurements
and operations. Demonstrations of 2G-Bio-LSI such as a display of dot picture showing dox currents of 400 sensors (Fig. H) , a
simultaneous detection of O2 and H2O2 on one chip (Fig. I), and selective modification of sensor electrodes for highly sensitive
H2O2 detection revealed the 2G-Bio-LSI to be a promising tool for a wide range of analytical fields. Another development to
improve our Bio-LSI is integration of carbon materials onto the sensor electrodes, based on two joint researches with different
academic fields in WPI-AIMR, Tohoku University. One is a research with Samukawa laboratory using neutral beam enhanced
chemical vapor deposition (NBECVD).4) The other is a research with Tanaka laboratory employing a film transfer technology
using an adhesive resin layer for monolithic integration of boron doped diamond (BDD) microelectrodes on a LSI substrate. We
successfully got real time images of diffusion of biochemical spieces such as dopamine and histamine5) with these carbon material
integrated Bio-LSIs.
References:
1) K. Y. Inoue, et al. Lab Chip 12 (2012) 3481-3490. 2) M. Sen, et al. Biosens. Bioelectron. 48 (2013) 12-18. 3) M. Sen, et al.
Anal. Methods, 6 (2014) 6337–6342. 4)Y. Kikuchi, et al. Carbon 67 (2014) 635-642. 5) T. Hayasaka et al. Proceedings of the
27th IEEE International Conference on Micro Electro Mechanical Systems (2014) 322-325
Figure. (A-D) Photograph of Bio-LSI and sensor area. (E) Amperometric image of diffusion of H2O2 generated by enzyme reaction of glucose oxidase. (F) Photograph (a) and amperometric image (b) of embryo body with alkaline phosphatase activity. (G) Photograph (a) and amperometric image (b) of moving daphnia. (H) Dot picture showing the redox current of 400 sensors on 2G-Bio-LSI. (I) Simultaneous detection of O2 and H2O2 on one chip.
2014 AIMR Tohoku University-NCTU Joint Workshop
38
YewChung Sermon WU
Affiliation:Department of Materials Science and
Engineering,National Chiao Tung University
Address: EF 206A, Building VI
1001 University Rd., Hsinchu 300, Taiwan, R. O. C.
1. Education
Professor Wu received the Ph.D degree in Materials Science and Engineering and Electrical
Engineering from Stanford University in 1998. His Ph.D dissertation was on wafer bonding process
for optoelectronic devices.
2. Professional Experiences
After his graduation, he joined Cypress Semiconductor, San Jose, CA. In 1999, he joined the faculty
of National Chiao Tung University (NCTU), and currently is a professor, Department of Materials
Science and Engineering.
3. Scientific Interests:
(1) wafer bonding for optoelectronic devices including bonding mechanism and high brightness
LEDs (2) patterned sapphire substrate for high brightness GaN-based LEDs, and (3) diamond
composite substrate for thermal management of optoelectronic devices.
4. Major Awards and Honors
5. Recent papers :(5 papers)
1."Morphologies and Plane Indices of Pyramid Patterns on Wet-etched Patterned Sapphire Substrate,"
Materials Letters, 118 (2014), No9, 72-75.
2."The formation of smooth facets on wet-etched patterned sapphire substrate," ECS Journal of Solid
State Science and Technology, 3 (2014), No9, R5-R8.
3.“Evolution of Bottom c-Plane on Wet-Etched Patterned Sapphire Substrate," ECS Journal of Solid
State Science and Technology, 2 (2013), No9, R169-R171.
4.“The formation and the plane indices of etched facets of wet etching patterned sapphire substrate," J.
Electrochem. Soc., 159 (2012), No6, D362-6.
5.“Improved crystal quality and performance of GaN-based light-emitting diodes by decreasing the
slanted angle of patterned sapphire," Appl. Phys. Lett. 96(2010), 051109.
2014 AIMR Tohoku University-NCTU Joint Workshop
39
Growth of Zincblende GaN on Patterned c-plane Sapphire
Substrate
YewChung Sermon WU
Department of Materials Science and Engineering, National Chiao Tung University
EF 206A, Building VI
1001 University Rd., Hsinchu 300, Taiwan, R. O. C.
Phone: +886-3-5131555, Fax: +886-3-5724727
e-mail: [email protected], [email protected]
URL:http://www.mse.nctu.edu.tw/en/wu_yewchung_sermon.html
Abstract
Pattern sapphire substrate (PSS) has been used to improve the performance of GaN-based LEDs. This is
because most of the GaN growth was initiated from bottom c-planes. As the growth time increased, GaN
epilayers covered patterns by lateral growth causing the threading dislocation to bend toward the patterns
resulting in the improvement of epilayer quality, internal quantum efficiency and light extraction efficiency.
Normally these GaN was wurtzite structure. In this study, wet-etched pattern c-plane sapphire substrate was
used to grow zincblende GaN.
2014 AIMR Tohoku University-NCTU Joint Workshop
40
Hung Kim Nguyen
Affiliation: WPI-Advanced Institute for Materials Research,
Tohoku University
Address: 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan
1. Education
Jan. 2009 – July 2012: Ph.D. student at the Department of Physics, University of Pisa, Pisa, Italy.
Sep. 2001 – Feb. 2007: Bachelor and Master student at the Department of Physics, Lomonosov
Moscow State University, Moscow, Russia.
2. Professional Experiences
Sep. 2012 – present: Research Associate at WPI-Advanced Institute for Materials Research, Tohoku
Univerisity, Sendai, Japan.
Mar. 2007 – Dec. 2008: Researcher at the Department of Polymer Materials, Institute of Chemistry,
Vietnamese Academy of Science and Technology, Hanoi, Vietnam.
3. Scientific Interests:
+ Atomic force microscopy based methods
+ Surface dynamics of amorphous polymers
+ Confinement effects on mechanical and dielectric relaxation of polymer films
4. Major Awards and Honors
Scholarship of Galileo Galilei Ph.D. School, University of Pisa
5. Recent papers :(5 papers) 1. Nguyen, H. K.; Labardi, M.; Capaccioli, S.; Lucchesi, M.; Rolla, P.; Prevosto, D. Plasticization
in ultrathin polymer films: the role of supporting substrate and annealing. Macromolecules, 46,
555-561 (2013).
2. Nakajima, K.; Nguyen, H. K.; Wang, D. Length scale of mechanical heterogeneity in a glassy
polymer determined by atomic force microscopy. AIP Conf. Proc. 1518, 470-473 (2013).
3. Labardi, M.; Park, J. H.; Nguyen, H. K.; Prevosto, D.; Seong, C.-Y.; Mrzel, A.; Scalia, G. Local
dielectric spectroscopy of polyvinylpyrrolidone-Mo6S2I8 nanowire composite. J. Non-Cryst.
Solids, 379, 224-228 (2013).
4. Nguyen, H. K.; Labardi, M.; Capaccioli, S.; Lucchesi, M.; Rolla, P.; Prevosto, D. Interfacial and
annealing effects on primary α-relaxation of ultrathin polymer films investigated at nanoscale.
Macromolecules, 45, 2138-2144 (2012).
5. Nguyen, H. K.; Prevosto, D.; Labardi, M.; Capaccioli, S.; Lucchesi, M.; Rolla, P. Effects of
confinement on structural relaxation in ultrathin polymer films investigated by local dielectric
spectroscopy. Macromolecules, 44, 6588-6593 (2011).
2014 AIMR Tohoku University-NCTU Joint Workshop
41
Heterogeneous Behavior in Dynamics at the Surface Layer
of Glassy Polymer Films
Hung K. Nguyen
WPI-Advanced Institute for Materials Research, Tohoku University
2-1-1 Katahira, Aoba, Sendai 980-8577, Japan
Phone: +81-22-217-5928, Fax: +81-22-217-5975
e-mail: [email protected]
URL: http://west.wpi-aimr.tohoku.ac.jp/
Abstract
Despite increasing evidence that surface dynamics of glassy polymers can substantially alter from the
bulk behavior, a direct measurement of dynamical properties of polymer chains located at very near surface
remains a major challenge. By repeatedly scanning a small surface region of glassy polystyrene films using
dynamic atomic force microscopy with an ultra-sharp tip of ~ 1-nm apex radius, we here show a direct
observation of nanoscale heterogeneous domains in dynamics and their time-evolution at the polymer surface
layer. The length scale of these domains was measured to be ~ 2.1 nm and their lifetime was found on the
order of ~ 102 s, in agreement with the length and time scales of heterogeneous dynamics reported for bulk
polymers around the glass transition. This finding therefore provided experimental evidence of the existence
of a ~ 2.1-nm liquid-like layer at the glassy polymer surface as well as direct imaging of dynamical
heterogeneities in amorphous polymers. In addition, Persistenet Homology, a mathematic tool for
characterizing topological features of structural images, was preliminarily applied to analyze the arrangement
behavior of the observed heterogeneous domains.
2014 AIMR Tohoku University-NCTU Joint Workshop
42
Yuan-Chieh TSENG
Affiliation:National Chiao Tung University
Dept. of Materials Sci. & Eng., National Chiao Tung University
Address: 1001 Ta Hsueh Road, Hsin-Chu, Taiwan 30010
1. Education
Ph.D, Materials Science & Engineering, Northwetsern, U. S. A 2009
M. S., Materials Science & Engineering, National Tsing Hua Univeristy, Taiwan 2002
B. S., Materials Science & Engineering, National Tsing Hua Univeristy, Taiwan 2000
2. Professional Experiences
Associate Professor, National Chaio Tung Univeristy, 2013 August ~ present
Assistant Professor, National Chaio Tung Univeristy, 2009 August ~ 2013 July
3. Scientific Interests:
Spintronics materials, physical properties of materials, synchrotron radiation, magnetic oxides,
Interfacial magnetism
4. Major Awards and Honors
1. Teaching award, National Chiao Tung University, 2104 2. Teacher of the year, College of Engineering, National Chiao Tung University, 2104 3. Dr. Joseph Chou Memorial Scholarship, North America Taiwanese Engineers’ Association 4. Argonne student scholarship, Department of Energy (DOE), 2005~2009 (special appointee). 5. Walter P. Murphy Fellowship, McCormic school of Engineering, Northwestern University, 2004 6. Thesis award for Master student, Dept. Materials Science & Engineering, NTHU, 2002
5. Recent papers :(5 papers)
1. C. Y. Yang, Y. H. Lu, W. H. Lin, M. H. Lee, Y. Jung Hsu, H. J. Lin, and Y. C. Tseng* “Structural
imperfections and attendant localized/itinerant ferromagnetism in ZnO”, Journal of Physics D:
Applied Physics 47, 345003 (2014)
2. C .C. Huang, S. J. Chang, C. Y. Yang, H. Chou, and Y. C. Tseng* “Instrument for x-ray absorption
spectroscopy with in-situ electrical control characterizations”, Review of Scientific Instruments, 84,
123904 (2013)
3. Y.C. Tseng*, D. Paudya, Ya. Mudryk, V. K. Pecharsky, K. A. Gschneidner, Jr., and D. Haskel,
"Electronic contribution to the enhancement of the ferromagnetic ordering temperature by Si
substitution in Gd5(SixGe1-x)4", Physical Review B 88, 054428 (2013)
4. C. Y. Yang, L. W. Wang, P. A Chen, H. J. Lin, C. H. Lai and Y. C Tseng*, “Sharp Variation in
Coercivity and Magnetic Interactions in Patterned CoxNi1-x Nanoarrays”, Journal of Applied Physics,
114, 063902 (2013)
5. Y.C. Tseng*, H. J. Ma, C. Y. Yang, Ya. Mudryk, V. K. Pecharsky, K. A. Gschneidner Jr., N. M.
Souza-Neto and D. Haskel, "Effect of Si-doping and applied pressure upon magneto-structural
properties of Tb5(SixGe1-x)4 magnetocaloric compounds", Physical Review B 83, 104419 (2011)
2014 AIMR Tohoku University-NCTU Joint Workshop
43
Spintronic Materials Explored by Modern X-ray Absorption
Spectroscopy
Yuan-Chieh TSENG
Dept. of Materials Sci. & Engeering, National Chiao Tung University
1001 Ta Hsueh Road, Hsin-Chu, Taiwan 30010
Phone: +886-3-5731898, Fax: +886-3-5724727
e-mail:[email protected] URL: http://www.nctumse.url.tw/index.htm
Abstract
In this talk I will present how to use x-ray absorption spectroscopy (XAS) and x-ray magnetic circular
dichroism (XMCD) to investigate spintronic materials, and how to improve our understanding of spintronic
materials by the use of modified XAS/XMCD techniques.
In first part I will report a study focusing on the local symmetry of Cu-dopant and resultant structural
imperfections in mediating Zn1-xCuxO nanoaprticles’ ferromagnetism (FM). Prepared by an antisolvent
method, Cu appeared to preferably populate on the basal plane of ZnO with a local symmetry of [CuO4]. This
unique symmetry was antiferromagnetic in nature, while electronically and structurally coupled to surrounded
oxygen vacancies (Vo) that yielded a localized FM, because of a strong dependency on the number/location
of the [CuO4] symmetry. In surprise, the FM of undoped but oxygen-deficient ZnO appeared to be more
itinerant and long-range, where Vo percolated the FM effectively and isotropically through oxygen’s
delocalized orbital. By adopting the approach of structural imperfection, this study clearly identifies Vo’s
(defect’s) true characters in mediating the FM of magnetic semiconductors which has been thought of as a
long standing debate, and thus provides a different thinking about the traditional extrinsic
ferromagnetic-tuning in the semiconductors. It even illuminates recent researches concerning the intrinsic FM
of low-dimensional systems which contain defects but non-magnetic elements.
In second part I will report a developed synchrotron-based setup capable of performing XAS and XMCD
with simultaneous electrical control characterizations, at National Synchrotron Radiation Research Center
(NSRRC), Taiwan. The setup can enable research concerning electrical transport, element- and
orbital-selective magnetization with an in-situ fashion. It is a unique approach to the real-time change of
spin-polarized electronic state of a material/device exhibiting magneto-electric responses. The performance of
the setup was tested by probing the spin-polarized states of cobalt and oxygen of Zn1-xCoxO dilute magnetic
semiconductor under applied voltages, both at low (~20K) and room temperatures, and signal variations upon
the change of applied voltage were clearly detected. This setup helps identify the roles of all physical
variables affecting the magneto-electric effects, which can fundamentally improve the spintronic technology.
Research topics related to (i) electrical control electronic structures and (ii) element-specific study of
magneto-electric responses, will be greatly benefited by the use of the setup.
2014 AIMR Tohoku University-NCTU Joint Workshop
44
Nobuaki AOKI
Affiliation:WPI-AIMR, Tohoku University
Address:2-1-1, Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
1. Education
2006.5 Dr. Eng., Dept. Chemical Engineering, Graduate School of Engineering, Kyoto University
2. Professional Experiences
2006.6–2011.3 Assistant Professor, Dept. Chemical Engineering, Graduate School of Engineering,
Kyoto University
2011.4–Present Assistant Professor, WPI-AIMR, Tohoku University
3. Scientific Interests:
Nanoparticle synthesis in contious system, Viscosity and dispersion of nanofluid
4. Major Awards and Honors
2012.3 The SCEJ Award for Outstanding Young Researcher
5. Recent papers :(5 papers)
[1] “Hydrothermal Synthesis of Cerium Oxide Nanoassemblies through Coordination Programming
with Amino Acids”A.-A. Litwinowicz, S. Takami, D. Hojo, N. Aoki, T. Adschiri, Chem. Lett., in
press.
[2] “Hydrothermal Synthesis of Inorganic–Organic Hybrid Gadolinium Hydroxide Nanoclusters with
Controlled Size and Morphology”Dalton Trans., 2013, 42, 16176.
[3] “Supercritical hydrothermal synthesis” in Handbook of Advanced Ceramics, Second Edition:
Materials, Applications, Processing and Properties, Elsevier Ltd., Oxford, UK, T. Adschiri, S. Takami,
T. Arita, D. Hojo, K. Minami, N. Aoki, 2013, pp. 949–978 (Chap. 11.5.1).
[4] “Design of Confluence and Bend Geometry for Rapid Mixing in Microchannels”, N. Aoki, T.
Fukuda, N. Maeda, K. Mae, Chem. Eng. J., 2013, 227, 198.
[5] “Flocculation and re-dispersion of colloidal quantum dots”, N. Manabe, S. Hanada, N. Aoki, Y.
Futamura, K. Yamamoto, T. Adschiri, J. Chem. Eng. Japan, 2012, 45, 917.
2014 AIMR Tohoku University-NCTU Joint Workshop
45
Particle Re-dispersion and
Viscosity of Nanofluid in Shear Stress Field
Nobuaki AOKI
WPI-AIMR, Tohoku University
2-1-1, Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
Phone: +81-22-217-6323, Fax: +81-22-217-6323
e-mail: [email protected],
URL: http://www.wpi-aimr.tohoku.ac.jp/ajiri_labo/
Abstract
Nanoparticles tend to flocculate because of its high surface energy. An easy and effective method for
producing a colloidal solution in which flocculated nanoparticles become re-dispersed by using a back
pressure valve is proposed. Initially, a solution of nanoparticles (CdSe/ZnS-core/shell quantum dots) is left to
flocculate by storing water-soluble nanoparticles (modal diameter 13.5 nm) for 2 days at 40°C. A large shear
stress is applied to the solution in a back pressure valve for re-dispersing the flocculated particles. The
re-dispersibility is evaluated through the measurement of their size distribution. The results show that the
method re-dispersed the flocculated particles and reduces their modal diameter from over 6000 nm to 44 nm.
Then, we identify the mechanism of re-dispersion in this valve from the ratio of the applied shear stress to
the van der Waals interactive force. From the results, shear stress dominates the re-dispersion of flocculated
particles. Moreover, we can predict the particle diameter after the re-dispersion from the ratio of the shear
stress to the van der Waals interactive energy.
In addition, for establishing more precise design methodology of nanoparticle dispersion process, we’re
collaborating with mathematicians. In the workshop, a prediction of re-dispersed particle size from
mathematical modeling will be illustrated.
The state of nanoparticle dispersion also affects the viscosity of fluid including nanoparticles (so called
‘nanofluid’). The characteristics of viscosity of nanofluid in shear stress field will be discussed.
2014 AIMR Tohoku University-NCTU Joint Workshop
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Yi CHIU
Affiliation:Department of Electrical and Computer Engineering
National Chiao Tung University
Address:1001 Ta Hsueh Rd., Hsin Chu, Taiwan 300
1. Education
12/1996 Ph. D. (Electrical and Computer Engineering), Carnegie Mellon University, USA
2. Professional Experiences
8/2013 -
present
Department of Electrical and Computer Engineering, National Chiao Tung University
Professor
8/2007 -
7/2013
Department of Electrical and Computer Engineering, National Chiao Tung University
Associate Professor
3. Scientific Interests:
• Energy harvesting
• vibration-based electrostatic and electret energy harvesters
• system integration of energy harvesters for wireless sensor modules
• Micro-electromechanical system (MEMS)
• MEMS fabrication and assembly technology
• CMOS-MEMS sensors and optical MEMS
4. Major Awards and Honors
• Excellent Design Award, Outstanding Chip Design Competition, Chip Implementation Center
(CIC), Taiwan, R.O.C., 2012 (with Prof. H.-C. Hong and Mr. P.-C. Wu)
• Outstanding Teaching Award, ECE College, NCTU, Taiwan, R.O.C., 2012
• Outstanding Mentoring Service Award, NCTU, Taiwan, R.O.C., 2008
• Taiwan Storage Research Award, Taiwan Information Storage Association, Taiwan, R.O.C., 2006
(with Prof. J.-C. Chiou)
5. Recent papers :(5 papers)
1. “A three-axis single-proof-mass CMOS-MEMS piezoresistive accelerometer with frequency
output,” Y. Chiu, T.-C. Huang, and H.-C. Hong, Sensor Mater. 26(2), 95-108 (2014).
2. “Flexible electret energy harvesters with parylene electret on PDMS substrates,” Y. Chiu and S.-H.
Wu, J. Phys.: Conf. Ser., 476, 012037 (2013).
3. “Development and characterization of a CMOS-MEMS accelerometer with differential LC-tank
oscillators,” Y. Chiu, H.-C. Hong, and P.-C. Wu, J. Microelectromech. Syst.. 22(6), 1285-95
(2013).
4. “Flat and robust out-of-plane vibrational electret energy harvester,” Y. Chiu and Y.-C. Lee, J.
Micromech. Microeng., 23, 015012 (8 pp) (2013).
5. “Prism-type holographic optical element design and verification for the blue-light
small-form-factor optical pickup head,” H.-F. Shih, Y. Chiu, S. Cheng, Y.-C. Lee, C.-S. Lu, Y.-C.
Chen, and J.-C. Chiou, Appl. Opt. 51(24), 5758-66 (2012).
2014 AIMR Tohoku University-NCTU Joint Workshop
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Development of Energy Harvesting Technology
Yi CHIU
Department of Electrical and Computer Engineering
National Chiao Tung University
1001 Ta Hsueh Rd., Hsin Chu, Taiwan, ROC
Phone: +886-3-5731838, Fax: +886-3-5715998
e-mail: [email protected]
Abstract
This talk presents our efforts in the past years to develop various forms of energy harvesters. Energy
harvesting technology converts ambient energy resource into useful electricity for low-power electronics
applications. Vibrational energy harvesters are attractive for applications where constant vibration is present.
If the vibration has specific frequency and direction, such as those produced by factory machinery, resonant
structures can be developed for the harvesters to match the vibration characteristics to increase the power
conversion efficiency. Nevertheless, in situations such as human body movement, the motion is often random
in time and directions. Thus rigid and resonant harvesters can not be used. Instead, flexible harvesters with
non-resonant design must be developed for applications such as wearable electronics and implanted devices.
The theory and modeling of electrostatic energy harvesters are first reviewed. Silicon-based harvesters
fabricated by deep RIE in SOI substrates are discussed. Due to the brittle nature of silicon, we have
developed an electret-based harvester fabricated by using flexible printed circuit board (FPCB). Pulsed output
of 2.2 mW was delivered in an energy harvesting module in which the harvester was integrated with an
power management IC. I will also present a number of PDMS-based flexible energy harvesters that can be
attached to any curved surfaces to harvest the stain energy introduced by the deformed subject. Application of
the harvesters to human motion is demonstrated.
2014 AIMR Tohoku University-NCTU Joint Workshop
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Daisuke Hojo
Affiliation:Advanced Institute for Materials Research (AIMR),
Tohoku University
Address: 2-1-1 Katahira, Aoba-ku, Sendai, Japan 980-8577
1. Education
1992-1996 :
College of Natural Sciences at First Cluster of Colleges of University of Tsukuba
Awarded the degree of BS for a thesis entitled
“The calculation of Lamb’s shift in hydrogen atoms using Relativistic Quantum Field Theory”
Work supervised by Professor Yang.
1996-1998 :
Master Program in Science and Engineering at University of Tsukuba
Awarded the degree of MS for a thesis entitled
“Basic research on scintillation tile/glass fiber system of hadron calorie meter for Japan Liner
Collider”
Work supervised by Professor Kim.
2000-2003 :
Doctoral Program in Engineering at University of Tsukuba
Awarded the degree of Ph. D. in Engineering for a thesis entitled
“The formation of atomic step/terrace structure on silicon surfaces and the quantitative roughness
evaluation of silicon surfaces”
Work supervised by Professor Yamabe.
2. Professional Experiences
2003-2005 :
AIST Research Fellow (Post-doc.) in Advanced Semiconductor Research Center,
National Institute of Advanced Industrial Science and Technology (AIST), Japan
Work supervised by Dr. Yasuda.
2005-2007 :
Research Fellow (Post-doc.) in Department of Chemical and Biomolecular Engineering at North
Carolina State University
Work supervised by Prof. Parsons.
2007-2008 :
Post-doc. in Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
2014 AIMR Tohoku University-NCTU Joint Workshop
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Work supervised by Prof. Adschiri.
2008-Present
Assistant Professor in Advanced Institute for Materials Research (AIMR), Tohoku University.
3. Scientific Interests:
Nanostructure fabrication and functions
4. Major Awards and Honors
N/A
5. Recent papers :(5 papers)
1. D. Hojo, T. Togashi, T. Ohsawa, M. Saito, Z. Wang, Y. Sakuda, S. Asahina, Y. Ikuhara, T. Hitosugi,
and T. Adschiri
“Nanoepitaxy of Anatase-type TiO2 on CeO2 Nanocubes Self-Assembled on a Si Substrate for
Fabricating Well-Aligned Nanoscale Heterogeneous Interfaces”
Cryst. Growth Des. Accepted.
2. A.-A. Litwinowicz, S. Takami, D. Hojo, N. Aoki, and T. Adschiri
“Hydrothermal Synthesis of Cerium Oxide Nanoassemblies through Coordination Programming with
Amino Acids”
Chem. Lett. 8, 1343 (2014).
3. M. Dejhosseini, T. Aida, M. Watanabe, S. Takami, D. Hojo, N. Aoki, T. Arita, A. Kishita, T.
Adschiri
“Catalytic Cracking Reaction of Heavy Oil in the Presence of Cerium Oxide Nanoparticles in
Supercritical Water”
Energy &Fuels 27, 4624 (2013).
4. *D. Hojo, T. Togashi, and T. Adschiri
“Self-Assembly and Reassembly phenomena of Organic-Inorganic Hybrid Nanocrystals in Highly
ordered Nanocrystalline Multi/Monolayer”
Jpn. J. Appl. Phys. STAP, 52, 110113 (2013).
5. *D. Hojo, T. Togashi, D. Iwasa, T. Arita, K. Minami, S. Takami, T. Adschiri.
“Fabrication of Two-dimensional Structures of Metal oxide Nanocrystals using Si substrate
Modified with 3,4-Dihydroxyhydrocinnamic Acid”
Chemistry of Materials 22, 1862 (2010)
2014 AIMR Tohoku University-NCTU Joint Workshop
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Fabrication and Functionalization of Monolayer-controlled
Nanocrystalline Films
Daisuke Hojo and Tadafumi Adschiri
Advanced Institute for Materials Research (AIMR), Tohoku University
2-1-1 Katahira, Aoba-ku, Sendai, Japan 980-8577
Phone: +81-22-217-6323, Fax: +81-22-217-6323
e-mail: [email protected]
URL: http://www.wpi-aimr.tohoku.ac.jp/ajiri_labo/
Abstract
Realizing the printed electronics where metal oxide nanocrystals (NCs) are incorporated has attracted
considerable attention recently. Generally, high crystalline metal oxide films are only obtained through high
temperature treatments. If the high crystalline metal oxide NCs are formed elsewhere at high temperature in
advance and those are aligned densely on the surface at room temperature, high crystalline film layer can be
fabricated even on a heat-sensitive substrate. In order to apply metal oxide NCs to the surfaces, three things
have to be considered at least. 1) Disperse the NCs in a solvent. 2) Self-assemble the NCs on the substrate
with drying the solvent. 3) Fix the NCs on the substrate. Among these processes, necessary interaction
between the metal oxide cores, modifiers, solvent, and the substrate is totally different. This could then lead
to a difficulty to apply NCs to the surface.
In this talk, dispersion of cerium oxide NCs and magnetites in solvent will be a first topic to be mentioned.
In order to disperse NCs, those were modified with fatty acid during synthesis of NCs to produce
organic-inorganic hybrid NCs. In certain medium, high-density of self-assembled monolayer of fatty acid
was formed on the surfaces of metal oxide core. This results in making high-concentrated fluids dissolving
NCs, over 50 wt% of NCs.
Then, rearrangement of hybrid NCs during solvent annealing is discussed after self-assembly of hybrid
NCs on the substrate at room temperature. Atomic force microscope observation revealed that after the
solvent anneal in tetrahydrofuran (THF) at 40-80°C for 5-15h, cerium oxide hybrid NCs adsorbed on the
substrate were rearranged to be more highly-ordered structures. Uniform and highly ordered nanocrystalline
multilayers were obtained after tetrahydrofuran annealing of pre-assembled hybrid NCs on the substrate
surfaces while due to low mobility of hybrid NCs in a solvent, arrangement of hybrid NCs had occurred
insufficiently during self-assembly with drying at room temperature. As a result of the rearrangement
process during solvent annealing, cerium oxide hybrid NCs were correctly positioned in the nanocrystalline
film layers because of high carrier ability and the high affinity of the solvent to the NCs. This
rearrangement of NCs to obtain high-ordered structures of hybrid NCs will be a key technology for precisely
controlled colloidal supralattice structures. However, when THF annealing applied to the hybrid NCs after
fixing on the substrate, where the chemical bonds were established between hybrid NCs and the substrate by
using local ligand exchange, no rearrangement occurred during solvent annealing. Solvent annealing had
almost no effect on the nanocrystalline monolayer macroscopically, indicating that hybrid NCs chemisorbed
on the modified substrate surface did not move freely as compared with hybrid NCs on top of the
2014 AIMR Tohoku University-NCTU Joint Workshop
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pre-assembled hybrid NCs. Interaction between the hybrid NCs and the substrate is too strong to rearrange
those hybrid NCs in nanocrystalline monolayer.
A sufficiently highly ordered nanocrystalline monolayer was self-assembled in the concentrated solvent
and thus printed to such a sticky surface from a face-down configuration that prevented the random
deposition of hybrid NCs, resulting in the uniform and ordered nanocrystalline monolayer of macroscopic
size. To arrange hybrid NCs on such a “sticky” surface, pre-aligned hybrid NCs in the solvent should be
printed on the surface before random deposition taking place by using this face-down configuration.
In this talk, magnetooptic characterisitic of magnetite nanocrystalline monolayer will be also mentioned.
2014 AIMR Tohoku University-NCTU Joint Workshop
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Dr. Hong-Cheu Lin
Chairman/Professor
Dept. of Materials Sci. & Eng., National Chiao Tung University
Tel: 8863-5712121ext. 55305; Fax: 8863-5724727
E-mail: [email protected]
1. Education
1979-1983
B.S. Degree in Chemical Engineering, National Taiwan University
1985-1986
M.S. Degree in Chemical Engineering, Northwestern University
1986-1992
Ph.D. Degree in Materials Sci. & Eng., University of Illinois at Urbana-Champaign
2. Professional Experiences
3. Scientific Experience
1992-2000:
Assistant and Associate Research Fellow
Institute of Chemistry, Academia Sinica
2000-2005:
Associate Professor
Dept. of Materials Sci. & Eng., National Chiao Tung University
2005-now:
Professor
Dept. of Materials Sci. & Eng., National Chiao Tung University
4. Major Awards and Honors
5. Research Interests:
Liquid Crystal (LC) Materials, OLED and PLED Materials, Organic Solar Cell Materials,
Chemo- and Bio-Sensor Materials, Organic Electro-Optical Materials, Supramolecular
Materials and Nano-Composites.
2014 AIMR Tohoku University-NCTU Joint Workshop
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Self-Assembly Applications of Supramolecular Complexes
and Nanocomposites
Hong-Cheu Lin (林宏洲), I-Hung Chiang, Chong-Lun Wei, Chien-Min Lin
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu,
Taiwan
Abstract
Two series of supramolecular polymer complexes containing two triblock copolymer proton acceptors,
i.e., poly(4-vinylpyridine)-block-polystyrene-block-poly(4-vinylpyridine) (VSV) and
polystyrene-block-poly(4-vinylpyridine)-block-polystyrene (SVS), hydrogen-bonded with two generations of
mesogenic dendritic proton donors (G1 and G2) were prepared and investigated. Four supramolecular
polymer complexes (i.e., VSV-G1, VSV-G2, SVS-G1, and SVS-G2) confirmed the formation of a
microphase separated SmA structure corresponding to a head-to-head layered arrangement. The hierarchical morphologies of these supramolecular polymer complexes were proven not only by the patterns of SAXS but
also by directly visualized images of TEM. These results demonstrated the localized layered structure in
small domains corresponded to the smectic arrangement of dendrons and the characteristic structure in large
domains matched the volume fractions of the respective blocks. These hierarchical H-bonded structures can
be further utilized to construct functionalized self-assemblies.
G1 G2
Another series of hydrogen-bonded bent core liquid crystals containing
a bent-core pyridyl acceptor and four siloxane acid donors, i.e., S1-NBF14, POSS1-NBF14, C4-NBF14, and
POSS8-NBF14, were synthesized to study the influence of the structure of siloxane terminal group on the
mesogenic behavior. The liquid crystalline phases and mesomorphic behavior of all the compounds were
identified from the results of DSC, POM, electro-optical measurement and GISAXS. Thus, these
supramolecular systems may offer new applications of nanostructured polymers as templates to be combined
with their complementary dendritic mesogenic moieties. In addition, bent-core blue phase LCs will be
developed in this study.
References:
1) L. Y. Wang, S. Y. Tsai, and H. C. Lin, Macromolecules, 43, 1277 (2010).
2) W. H. Chen, W. T. Chuang, U. S. Jeng, H. S. Sheu, and H. C. Lin, J. Am. Chem. Soc., 133, 15674 (2011);
W. H. Chen, Y. T. Chang, J. J. Lee, W. T. Chuang, and H. C. Lin, Chem. Eur. J., 17, 13182 (2011).
3) I. H. Chiang, C. J. Long, H. C. Lin, W. T. Chuang, J. J. Lee, and H. C. Lin, ACS Appl. Mater. Inter., 6,
228 (2014).
_____________________________________________
* presenting author; E-mail: [email protected]
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2014 AIMR Tohoku University-NCTU Joint Workshop
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Yasumasa NISHIURA
Affiliation:WPI Advanced Institute for Materials Research
(WPI-AIMR),
Tohoku University
Address: Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
1. Education
1973 Bachelor of Science, Kyoto University
1975 Master of Science, Osaka University
1982 Doctor of Science, Kyoto University
2. Professional Experiences
1978-1982 Lecturer, Kyoto Sangyo University, Japan
1982-1989 Associate Professor, Kyoto Sangyo University, Japan
1989-1991 Associate Professor, Faculty of Science, Hiroshima University, Japan
1991-1995 Professor, Applied Mathematics, Faculty of Integrates Arts and Science, Hiroshima
University, Japan
2003-2005 Director, Research Institute for Electronic Science, Hokkaido University, Japan
1995-2012 Professor, Leader of Research Group for Nonlinear Studies and Computation,
Research Institute for Electronic Science, Hokkaido University, Japan
2012-present Professor, WPI-AIMR, Tohoku University, Japan
3. Scientific Interests:
I am currently a leader of Math Unit and Interface Unit of WPI-AIMR from April 1st, 2012. The
mission of these units is to enhance and activate the fusion research catalytically among
experimentalists and theoreticians at AIMR as well as doing own research in an interactive way. The
three targets: Nonlinear and non-equilibrium materials, Topological materials, and Multi-scale and
hierarchical materials are the keys when the members of these units work together with
experimentalists. The interface group is in particular important and it is the driving force toward the
goal of AIMR. Each member of it does not belong to a specific laboratory and can choose the
appropriate topics based on him/her background, which are linked to at least one of the above three
targets.
I am coordinating the activities in accordance with their backgrounds and create the atmosphere in
which fusion research will be accelerated smoothly.
4. Major Awards and Honors
The 2002 MSJ Autumn Prize, The Mathematical Society of Japan (2002)
Lecturer for Distinguished Colloquium Series of IAM-PIMS-MITACS2007/08, The Institute of
Applied Mathematics (2008)
Prize for Science and Technology (Research Category), The Commendation for Science and
Technology by the Minister of Education, Culture, Sports, Science and Technology (2012)
5. Recent papers :(5 papers)
2014 AIMR Tohoku University-NCTU Joint Workshop
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1. Masaaki Yadome, Yasumasa Nishiura, and Takashi Teramoto : “Robust pulse generators in
an excitable medium with jump-type heterogeneity”, SIAM Journal on Applied Dynamical Systems, 13(3), 1168-1201(2014) DOI:10.1137/13091261X
2. Kei-Ichi Ueda, Masaaki Yadome and Yasumasa Nishiura : “Multistate network for loop
searching system with self-recovery property” , Physical Review E, 89(2), 022810 (2014) DOI:
10.1103/PhysRevE.89.022810
3. Yasumasa Nishiura, Takashi Teramoto and Masaaki Yadome : “Heterogeneity-Induced Pulse
Generators”, Advances in Cognitive Neurodynamics, Vol. III : 371-377 (2013)
DOI:10.1007/978-94-007-4792-0_50
4. Kei Nishi, Yasumasa Nishiura and Takashi Teramoto : “Dynamics of two interfaces in a hybrid
system with jump type heterogeneity”, Japan Journal of Industrial and Applied Mathematics, (2013)
DOI:10.1007/s13160-013-0100-x
5. Takeshi Watanabe, Makoto Iima and Yasumasa Nishiura : “Spontaneous formation of travelling
localized structures and their asymptotic behaviour in binary fluid convection”, Journal of Fluid
Mechanics, Vol.712, 219-243 (2012) DOI: 10.1017/jfm.2012.413
2014 AIMR Tohoku University-NCTU Joint Workshop
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Wen-Wei Lin
Dept. of Appl. Math., National Chiao Tung Univ.
1001 University Rd. Hsinchu, 30010 Taiwan
1. Education
Ph.D., University of Bielefeld, Germany, 1985 (Appl. Math., Numer. Anal.).
2. Professional Experiences
(Times New Roman, 10pt)
3. Scientific Interests:
–Numerical Analysis, Matrix Computations, Optimal Control,
–Chaotic Dynamical System, Parallel Computations, Matrix Theory.
4. Major Awards and Honors
– Outstanding Research Award, 1994–1995, National Science Council.
– Distinguished Research Award, 1999, Sun Yat-sen Academic Foundation.
– Outstanding Research Award, 2002–2004, National Science Council.
– Academic Award from Ministry of Education, 2004.
– Chair Professor of Tsing Hua University, (2005–2008).
– National Chairship Professor, (2007–2009).
– Chair Professor of Chiao Tung University, (2008–2010).
– Distinguished Professor of Taiwan University, (2010–2011).
– Chair Professor of Chiao Tung University, (2012–present).
5. Editorial Work :
– Associate Editor of SIAM Journal on Matrix Analysis and Applications (SIMAX), 2013~.
– Associate Editor of Communications in Information and Systems, (2014–present).
– Associate Editor of Electronic Transactions on Numerical Analysis, (2014–present).
2014 AIMR Tohoku University-NCTU Joint Workshop
57
Musou Band無雙樂團
Performance at
2014 AIMR Tohoku University-NCTU Joint Workshop
台日東北大交大元件、材料與數學跨領域國際研討會
Place: 10F Ambassador Hotel, Hsinchu City
新竹國賓飯店 10F
Time: 6:30 – 7:00 PM, Sep. 23, 2014
無双樂團 Official Youtube link:
https://www.youtube.com/channel/UC1EEHgSS_AQ2Oz07mxDUENg
2014 AIMR Tohoku University-NCTU Joint Workshop
58
無双樂團 曲目 (Program)
CD 順序 曲名 (Song title) 時間
(Time duration)
01 夜來香 (Tuberose) 3:17
02 閉月 (Veiled moon) 3:59
03 我只在乎你 (時の流れに身をまかせ) 4:16
04 鄧雨賢組曲 (雨夜花+望春風+四季紅) 5:16
05 國色 (Stunning Beauty) 3:54
06 大手拉小手(幻化成风) 4:11
07 北國之春(北国の春) 3:54
08 鳳陽花鼓(お祝いの歌) 3:18