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Open AccessArticle

Low Friction at the Nanoscale of Hydrogenated Fullerene-Like Carbon Films

1
Department of Physics, University of Basel, 4056 Basel, Switzerland
2
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Coatings 2020, 10(7), 643; https://doi.org/10.3390/coatings10070643
Received: 13 April 2020 / Revised: 22 June 2020 / Accepted: 27 June 2020 / Published: 1 July 2020
(This article belongs to the Section Tribology)
Friction force microscopy experiments at the nanometer scale are applied to study low friction of hydrogenated fullerene-like carbon films. The measured friction coefficients indicate that lower hydrogen concentration during preparation is beneficial to enter the low friction regime, especially in combination with only methane as precursor. Furthermore, two regions are found with distinct friction coefficients and surface roughnesses related to different surface structures. One is rich in amorphous carbon and the other is rich in fullerene-like carbon, dispersed on the same surface. Transmission electron microscopy and Raman spectroscopy images verify this observation of the two separated structures, especially with the extracted fullerene-like structures in the wear debris from macro friction experiments. It is speculated that hydrogen may tend to impair the growth of fullerene-like carbon and is therefore detrimental for lubricity.
Keywords: fullerene-like; carbon films; friction; hydrogen concentration fullerene-like; carbon films; friction; hydrogen concentration
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MDPI and ACS Style

Liu, Z.; Wang, Y.; Glatzel, T.; Hinaut, A.; Zhang, J.; Meyer, E. Low Friction at the Nanoscale of Hydrogenated Fullerene-Like Carbon Films. Coatings 2020, 10, 643.

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