nanotechnologie: oder die relevanz des...
TRANSCRIPT
Materials Sci ence & Technolog y
Nanotechnologie: Oder die Relevanz des Nanometers
Dr. Pierangelo Gröning
Empa, Swiss Federal Laboratories for Materials Testing and Research„nanotech @ surfaces“ LaboratoryFeuerwerkerstrasse 39CH-3602 Thun
Empa / P. Gröning/ Alu Kongress 08 2
1 Nanometer = 10-9 m = 0.000‘000‘001 m
Carbon Nanotube (CNT):• Diameter: 1 – 20 nm• Length: up to centimeter
Empa / P. Gröning/ Alu Kongress 08 3
What makes „Nano“ so Interesting?
Macro Micro Nano
10-3 m 10-9 m10-6 m
Increase of the specific surface area!!
Optical behavior Quantum effectsMechanical Properties
Empa / P. Gröning/ Alu Kongress 08 4
„Nanotechnology“ in the Middle Age
The Lycurgus Cup, 4th century AD illumination outside → green !Illumination inside → red!
“Labors of the Months” (Norwich, England, ca. 1480)
Empa / P. Gröning/ Alu Kongress 08 5
Nanotechnology: Evolutionary & Revolutionary
According to H. Rohrer „ Il Nuovo Cimeto“ 107 A (1994)
Empa / P. Gröning/ Alu Kongress 08 7
Wire Sawing of Solar CellsGoal: Reduction of the wafer thickness from 300 μm to 100μm!
Drahtoberfläche
Wafer-Oberfläche
10μm
10μm
Wire Sawing Parameters:• wire tension• speed• size & type off abrasives• type and viscosity lubricant
Empa / P. Gröning/ Alu Kongress 08 8
Processing with Sub-Nanometer Precision
Transmission Electron Microscope Imageof the magnetic multilayer structure
Schematic drawingof a magnetic multilayer structure
New Magnetic Memory Materials
H.Hug et al., Empa Dübendorf
Empa / P. Gröning/ Alu Kongress 08 9
Scanning Tunnlling Microscope (STM): The Door to the Nano-Cosmos
Sensing instead of seeing!!
First STM Image (Silicon Surface, IBM 1981)Nobel Prize 1986!!
Heinrich Rohrer Gerd Binnig
Empa / P. Gröning/ Alu Kongress 08 10
Positioning of Single Atoms and Molecules
Low Temperatur STM @ EmpaToperating = - 270 °CResolution in z: 300 fm = 0.0003 nm!! K.-H. Ernst / Empa
Propen (C3H6)
Empa / P. Gröning/ Alu Kongress 08 11
Lotus flower: In eastern cultures the symbol for cleanness!
Nanotechnology: Mimic of Natural StructuresSelf-cleaning Surfaces
Empa / P. Gröning/ Alu Kongress 08 12
Scanning Electron Microscope Image of the Lotus leaf surface
Lotus Effect: Self-Cleaning Surfaces
Small water droplets are lifting upa dust particle.
The naps are covered with hydrophilic wax
hairs.
A water droplet loaded withdust particles
T. Geiger et al., Empa Dübendorf
Empa / P. Gröning/ Alu Kongress 08 13
Non-wetting Clothing
South American fishing spider(Ancylometes)
University of Bonn; ITV Denkendorf
fine air-trapping hairs
Empa / P. Gröning/ Alu Kongress 08 14
Nano-Particles: Raw Material for Many Applications
Flammensynthese
SiO2
TiO2
ZnO
ZrO2
CeO
Al2O3
….
A. Vital et al., Empa Dübendorf
Transmission Electron Microscope Image ofnon-aggregated nano-particles
Empa / P. Gröning/ Alu Kongress 08 16
Few Applications with Nano-Particles
Porous ceramics (catalysts, filters, etc.)
Transparent, hard lacquers
Zahnersatz-Keramiken
Pharmaceutics Products
Empa / P. Gröning/ Alu Kongress 08 17
Magnetic Curing Glues: Mag. Nano-particles
Magnetic heating curves of aglue with 5% MagSilica®
Transmission Electron MicroscopeImage of MagSilica®Black: mag. Ironoxide nano-particlesGrau: Silicon Matrix
Empa / P. Gröning/ Alu Kongress 08 18
Tumor Therapy with Mag. Nano-ParticlesDr. A. Jordan, Charité Berlin
Heating of the tumor up to 49°C
Dr. A. Jordan, Charité Berlin
Injection of a water solution with Ironoxide
nano particles (MagForce®) encapsulatedin AminosilaneConcentration ~ 100 mg/ml
Empa / P. Gröning/ Alu Kongress 08 19
Carbon Nanotubes (CNT)
Carbon Nanotubes can be regarded as rolledup graphene sheets.
Discovered by Sumio Iijima (NEC)• Single Walled CNT (SWNT)1991• Multiwalled CNT (MWNT) 1993
Empa / P. Gröning/ Alu Kongress 08 20
CNT-Films: Produced by Chemical Vapour Deposition
K. Hata et al., 306 (2004) 1362
Catalyst: FeCl3Gas: C2H4 (Ethylene)Growth rate: 2.5 mm in 10 minutes!!
Empa / P. Gröning/ Alu Kongress 08 21
CNT Applications: Transparent el. Conductive Polymers
Ounais et al., Comp. Sci. & Technol. 63 (2003) 1637
νc: critical CNT concentration
νc
Polyimide/SWNT (l ~ 3 μm)
Empa / P. Gröning/ Alu Kongress 08 22
Carbon Fiber Composites (CFC)
CFRP tendons
Dreamliner (Boeing 787)• 10% more economically due to CFC• CFC Content ~ 60%!!
Empa / P. Gröning/ Alu Kongress 08 23
CNT Reinforced Carbon Fiber Composites
The company BMC in Grenchen (SO)developed a CNT/CFC bicycle frameof only ~ 900g in weight!
NASA's Morphing Glider
Carbon Fibre
Epoxy +C-Nanotubes
Empa / P. Gröning/ Alu Kongress 08 26
Metal Tip- or Spindt-Tip Technology
Field Emission Display (FED)
Empa / P. Gröning/ Alu Kongress 08 27
Oriented Growth of Carbon Nanotubes
Courtesy: B. Milne
Homogeneity:• Diameter: σD (~ 4.1%)• Height: σH (~ 6.3%)
Fully integrated micro-electron source
Empa / P. Gröning/ Alu Kongress 08 28
Applications with CNT Cold Electron Sources
Microwave amplifier for satellitesustained telecommunication.
f = 100 GHz, j = 10 A/cm2, i = 10 mA
New X-ray Sources
Field Emission Display (LETI (F))
Thomson
Empa / P. Gröning/ Alu Kongress 08 29
David J. GrundlachNational Institute of Standards and Technology,Gaithersburg, Maryland 20899, USANature Materials, March 2007
Advantage compared to classicalSi-electronis:
much, much cheaper!!!
Applications:e.g. „Intelligent“ Packaging
Organic Electronics
Empa / P. Gröning/ Alu Kongress 08 30
Organic Light Emitting Diodes (OLED)
Prototyp of a 40“ OLED-Display(SAMSUNG, 2007)
Empa / P. Gröning/ Alu Kongress 08 31
Laser Induced Forward Transfer (LIFT)
PDC = Photodecomposible chromophore
PDC PDC
UV laser pulsehν
hν
hν hν hν
Aryltriazene photopolymerssince ~1993 for laser ablation
NN
N
R
NN
N
R
NN
N
R
NN
N
R
N N
N
R
N N
N
R
Empa / P. Gröning/ Alu Kongress 08 32
48 h post transfer
Laser Induced Forward Transfer (LIFT)
CdSe Quantum dotsyellow: Ø = 5 nm red: Ø = 6 nm
Neuroblast B35 cells in extracellular matrix (ECM)A. Doraiswamy et al., Appl. Surf. Sci. 252, 4743 (2006)J. Xu et al., Nanotechnology 18, 025403 (2007)
Empa / P. Gröning/ Alu Kongress 08 33
Transfer of an OLED by LIFT
0 ns 200 ns 400 ns 600 ns 800 ns
R. Fardel et al.,Appl. Phys. Lett. 91, 061103 (2007)
Empa / P. Gröning/ Alu Kongress 08 34
Self-Assembly: Mimic of Natural Concepts
Army ants
Tobacco- Mosaic Virus
Empa / P. Gröning/ Alu Kongress 08 37
Thesen zur Nanotechnologie
1) Nanotechnologie – Vorstoss an die technologischen Grenzen
2) Nanotechnologie – Wege zu neuen Verfahrenstechniken
3) Nanotechnologie – Türe zu neuartigen Komposit- & Hybridwerkstoffen
4) Nanotechnologie – Herausforderung für die Ingenieurwissenschaften
5) Nanotechnologie – Risiken sind überschaubar
6) Nanotechnologie – Potential für eine „Disruptive Technology”