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Tunneling Current-Distance Characteristic of Scanning Vibrating Probe / 1-Alkanethiol Self-Assembled Monolayer (SAM) / Au (111) Structure

Published online by Cambridge University Press:  01 February 2011

Yuhsuke Yasutake ,
Yasuo Azuma ,
Kouhei Nagano  and
Yutaka Majima
Yuhsuke Yasutake
Affiliation:
Department of Physical Electronics, Tokyo Institute of Technology, 2–12–1 O-okayama, Meguro-ku, Tokyo 152–8552, Japan
Yasuo Azuma
Affiliation:
Department of Physical Electronics, Tokyo Institute of Technology, 2–12–1 O-okayama, Meguro-ku, Tokyo 152–8552, Japan
Kouhei Nagano
Affiliation:
Department of Physical Electronics, Tokyo Institute of Technology, 2–12–1 O-okayama, Meguro-ku, Tokyo 152–8552, Japan
Yutaka Majima
Affiliation:
Department of Physical Electronics, Tokyo Institute of Technology, 2–12–1 O-okayama, Meguro-ku, Tokyo 152–8552, Japan Organization and Function, PRESTO, Japan Science and Technology Agency, 2–12–1 O-okayama, Meguro-ku, Tokyo 152–8552, Japan
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Abstract

We report measurements of the tunneling current – distance (I-d) dependence above alkanethiol self-assembled monolayers (SAMs) on Au (111) substrates with high probe voltage. From the semilogarithmic I-d plots of hexanethiol and octanethiol SAMs, a kink in the tunneling current slopes is clearly observed, which shows the point where the STM tip contacts the end of the SAMs. The conductance decay constants of the vacuum layer and the alkanethiol SAMs are estimated from the tunneling current slopes. We also discuss the contact conductance of alkanethiol SAMs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 782: Symposium A – Micro- and Nanosystems , 2003 , A1.4
Copyright
Copyright © Materials Research Society 2004

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References

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