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Controlling microscopic friction on gold surfaces by electrochemical potential

Published online by Cambridge University Press:  03 February 2012

Florian Hausen ,
Johannes A. Zimmet  and
Roland Bennewitz
Florian Hausen
Affiliation:
INM – Leibniz-Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
Johannes A. Zimmet
Affiliation:
INM – Leibniz-Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
Roland Bennewitz
Affiliation:
INM – Leibniz-Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
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Abstract

The nano-scale friction on crystalline gold surfaces can be systematically varied by changing the oxidation state of the surfaces through an applied electrochemical potential. We present experimental results from high-resolution friction force microscopy, where the atomic structure of the surface is reflected in lateral force maps. While the oxidation of gold surfaces always brings upon a significant increase in friction, the situation is more complex in the potential regime where only sulfate anions are adsorbed. The influence of adsorbed anions on friction depends on electrochemical potential and on normal load, demonstrating that electrochemical processes and sliding dynamics are altered in the confinement of the tip-sample contact.

Keywords

tribologyscanning probe microscopy (SPM)surface chemistry
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1423: Symposium RR – Dynamics in Confined Systems and Functional Interfaces , 2012 , mrsf11-1423-rr01-05
Copyright
Copyright © Materials Research Society 2012

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References

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