Origin of Ultralow Friction andWear in Ultrananocrystalline Diamond
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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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2008-06-13
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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