Abstract
We have studied friction and dissipation in single and bilayer graphene films grown epitaxially on SiC. The friction on SiC is greatly reduced by a single layer of graphene and reduced by another factor of 2 on bilayer graphene. The friction contrast between single and bilayer graphene arises from a dramatic difference in electron-phonon coupling, which we discovered by means of angle-resolved photoemission spectroscopy. Bilayer graphene as a lubricant outperforms even graphite due to reduced adhesion.
- Received 27 November 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.086102
©2009 American Physical Society
Synopsis
SynopsisTwo is better than one for a smooth ride
Published 2 March 2009
The friction on a sharp tip sliding along a double layer of graphene is half that of a single layer. The source of the contrast may be the difference in electron-phonon coupling in the two systems.
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