Departmental Papers (MEAM)

Document Type

Journal Article

Date of this Version

June 2008

Comments

Copyright American Physical Society. Reprinted from Physical Review Letters, Volume 100, Article 235502, June 2008.
Publisher URL: http://dx.doi.org/10.1103/PhysRevLett.100.235502

Abstract

The impressively low friction and wear of diamond in humid environments is debated to originate from either the stability of the passivated diamond surface or sliding-induced graphitization/rehybridization of carbon. We find ultralow friction and wear for ultrananocrystalline diamond surfaces even in dry environments, and observe negligible rehybridization except for a modest, submonolayer amount under the most severe conditions (high load, low humidity). This supports the passivation hypothesis, and establishes a new regime of exceptionally low friction and wear for diamond.

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Date Posted: 16 July 2008

This document has been peer reviewed.