tailoring the electrical behavior in single-molecule … · ismael díez-pérez ibec-institute for...

TAILORING THE ELECTRICAL BEHAVIOR

IN SINGLE-MOLECULE WIRES

Ismael Díez-Pérez

IBEC-Institute for Bioengineering of Catalonia

ASU-Biodesign Institute, Arizona State University

NanoSpain

Bilbao 2011

OUTLINE

• Brief introduction to Molecular Electronics Why

How

Outline

• Methods to build single-molecule wires Combining AC-DC current methods

• Examples of single-molecule devices Molecular diode

Mechanical gate

Graphene-like FET

• Concluding remarks Summary of results

Future directions

Introduction Experimental Molecular Electronics

Methods in Molecular Electronics

Self-assembled monolayers (SAMs)

Melosh, De Boer et al.

Hyoyoung Lee et al.

Whitesides, Slowinski, Rampi, et al.

Kushmerick et al.

Lindsay, Weiss et al.

Schonenberger, van Ruitenbeek, Weber, Riel et al.

Single-molecule

Nizam, Ralph et al.

Frisbie, Bard et al.

OUTLINE

Outline

• Methods to build single-molecule wires Combining AC-DC current detection

Methods STM Break-junction

Building single-molecule junctions

STM break-junction set up

3 atoms

2 atoms

1 atoms

G0=2e2/h

Agrait et al. PRB, 1993; Pascaul, PRL 1993

2 molecule

1 molecule

Xu et al. Science 2003

Methods DC-AC Blinking

Building single-molecule junctions

DC-AC blinking method

AC-Current Signal

Xia, J., Diez-Perez, I. et al. Nano Letters 2008

DC-Current Signal

Haiss et al. Nature Materials 2004

0.0

0.5

1.0

1.5

2.0

Cu

rre

nt

(nA

)

Time (s) 0 1 2 3

Gmolec

ON

OFF

I=I0 exp(-Lgap)

OUTLINE

Outline

• Examples of single-molecule devices Molecular diode

Examples Diode

Single-molecule Diode Designing our single-

molecule diode

I. Diez-Perez et al. Nature Chemistry 2009

Au

Au

e-

Donor

e-

Accep

tor

Aviram and Ratner Chem. Phys. Lett. 1974

-e-

Don

or

-e-

Acce

ptor

-Bridge


Examples Diode

Single-molecule Diode

Symmetric tetraphenyl

Asymmetric diblock

-2 -1 0 1 2

BIAS VOLTAGE (V)-2 -1 0 1 2

BIAS VOLTAGE (V)

-2 -1 0 1 2BIAS VOLTAGE (V)

Examples Diode

Single-molecule Diode Rectification ratio

N=45 N=30 N=50

RR ( 1.5V) = 63

NaEtO TBAF

-2 -1 0 1 2

BIAS VOLTAGE (V)

>90 %

Orientation


RR ( 1.5V) 1

OUTLINE

Outline

• Examples of single-molecule devices

Mechanical gate

PULLING

SH

SH

Examples Electromechanics

Single-molecule Electromechanics

-orbitals

coupling SH

SH

NO

coupling

SH

SH

SH

SH

Theory on

Lateral

Coupling

G sin4

Ladder-type

pentaphenylene

block Kornilovitch &

Bratkovsky

2001

Controlling the current through -orbitals coupling

I. Diez-Perez et al. Nature Nanotechnology 2011



DC Blinking experiments:

pentaphenylene

DC Blinking:

tetraphenyl

AC-current

response



Continuous pulling on

pentaphenylene

SH

SH

SH

SH

AC-current

response

X-Y AC modulation

AC-MOD

FFT

I. Diez-Perez et al. Nature Nanotechnology 2011

OUTLINE

Outline

• Examples of single-molecule devices

Graphene-like FET

Examples Graphene FET

Single-molecule FET

A bottom-up approach to Graphene FETs

R

R

R

R

SH

SH

-Vg

Source Drain

Gate

Vsd

R(side)=

3.23 nm

Ismael Diez-Perez et al. Nature Comm. 2010

-0.8 -0.6 -0.4 -0.2 0.00.01

0.1

1

10

Electrochemical Gate (V)

Cu

rre

nt

(nA

)

-0.8 -0.6 -0.4 -0.2 0.0 0.20

1

2

3

4

5

6

Cu

rre

nt

(nA

)

Electrochemical Gate (V)

- High charge carrier

mobility provided by

benzocoronene

- Low dimensionality

opens up bandgap

OUTLINE

Outline

• Concluding remarks Summary of results

Future directions

Conclusions

Concluding Remarks

DC-AC Blinking method to build and characterize single-molecule junctions

Design & characterization of a Single-molecule Diode

Controlling electromechanical properties in a single-molecule contact

Single-molecule FET based on graphene-like molecules

Future directions: single-protein junctions!!

Acknowledgements

ASU Team:

• Prof. Nongjian Tao

• Dr. Josh Hihath

• Thomas Hines

• Christopher Bruot

• Shaoyin Guo

Chemical Synthesis:

• Prof. Luping Yu

• Youngu Lee

• Prof. Klaus Müllen

http://www.biodesign.asu.edu http://www.ibecbarcelona.eu

Future Research:

• Prof. Pau Gorostiza

• Prof. Fausto Sanz

•Juan Manuel Artes

THANKS FOR YOUR ATTENTION

QUESTIONS, COMMENTS OR

SUGGESTIONS ARE ALWAYS

WELCOME!!

tailoring the electrical behavior in single-molecule … · ismael díez-pérez ibec-institute for...

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