Chemical Modification in Wear Tracks of Chemical Vapor-Deposited Diamond Surfaces Studied with X-ray Absorption Spectroscopy
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We present high-quality X-ray absorption near edge structure spectra of chemical vapor-deposited diamond at the C K-edge recorded with high spatial resolution. We compare unworn surfaces with surfaces worn in Ar-atmosphere, in air, and in water, respectively. Strikingly, the degree of chemical modification in the wear tracks is strongest for wear in an inert Ar-atmosphere which we attribute to the massive creation of unsaturated bonds in the surface vicinity due to high friction forces. We discuss the nature of chemical modification, in particular, whether and to what degree graphitization, amorphization, and ex situ reactions take place.
KeywordsDiamond Carbon Graphite Unlubricated friction NEXAFS Abrasive wear
We gratefully acknowledge support from The Swedish Research Council (VR), The Swedish Foundation of Strategic Research (SSF) and The Göran Gustafsson Foundation (GGS). The MAXLAB staff is gratefully acknowledged for skillful technical assistance.
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