Departmental Papers (MEAM)

Document Type

Journal Article

Date of this Version



Suggested Citation:
A.R. Konicek, D.S. Grierson, P.U.P.A. Gilbert, W.G. Sawyer, A.V. Sumant, and R.W. Carpick. (2008). "Origin of Ultralow Friction and Wear in Ultrananocrystalline Diamond." Physical Review Letters. 100, 235502.

© 2008 The American Physical Society


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.



Date Posted: 19 January 2011

This document has been peer reviewed.