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Nanotribology of clean and modified gold surfaces

Published online by Cambridge University Press:  07 May 2013

Roland Bennewitz ,
Florian Hausen  and
Nitya Nand Gosvami
Roland Bennewitz*
Affiliation:
INM – Leibniz-Institute for New Materials and Physics Department, 66123 Saarbrücken, Germany
Florian Hausen
Affiliation:
INM – Leibniz-Institute for New Materials and Physics Department, 66123 Saarbrücken, Germany
Nitya Nand Gosvami
Affiliation:
Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Gold surfaces exhibit most interesting frictional properties on the nanometer scale. They can be studied in detail by means of friction force microscopy. Atomic-scale variations of the lateral force allow investigation of microscopic mechanisms of sliding. Friction force microscopy even reveals surface reconstruction of the gold surface as a modulation of the lateral force signal. Experiments indicate that the mobility of surface atoms at room temperature and plastic deformation mechanisms give rise to neck formation between gold and microscopic asperities in sliding contact. The frictional properties of gold surfaces change dramatically at temperatures below 150 K, where the surface diffusion is greatly reduced. Insight into the lubrication properties of self-assembled monolayers is provided by molecular-scale modulations of frictional forces. Molecular-scale maps of the friction force also allow identification of the relevant surface structure in experiments on electrochemically modified gold surfaces. Variation of the electrochemical potential is a means to reversibly switch between low and high friction states on gold surfaces.

Keywords

tribologyscanning probe microscopy (SPM)Au
Type
Invited Feature Paper
Information
Journal of Materials Research , Volume 28 , Issue 10 , 28 May 2013 , pp. 1279 - 1288
Copyright
Copyright © Materials Research Society 2013 

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