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Superlubric to stick-slip sliding of incommensurate graphene flakes on graphite

 
: Wijk, M.M. van; Dienwiebel, M.; Frenken, J.W.M.; Fasolino, A.

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Frontpage (HTML; )

Physical Review. B 88 (2013), No.23, pp.235423
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
ISSN: 2469-9950
English
Journal Article, Electronic Publication
Fraunhofer IWM ()
friction; hydrocarbon; dynamic; surface; model

Abstract
We calculate the friction of fully mobile graphene flakes sliding on graphite. For incommensurately stacked flakes, we find a sudden and reversible increase in friction with load, in agreement with experimental observations. The transition from smooth sliding to stick-slip and the corresponding increase in friction is neither due to rotations to commensurate contact nor to dislocations but to a pinning caused by vertical distortions of edge atoms also when they are saturated by hydrogen. This behavior should apply to all layered materials with strong in-plane bonding.

: http://publica.fraunhofer.de/documents/N-287272.html