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Ultra-low friction mechanism of highly sp3-hybrid amorphous carbon controlled by interfacial molecules adsorptions

Abstract

Friction behaviors of highly sp3-hybrid carbon films, including ultra-nanocrystalline diamond and diamond-like carbons, strongly depend on atmospheres. However, the role of corresponding molecules in the interfacial bonding characteristics remains a subject to debate. By means of density functional theory calculations, this study aims at filling a knowledge gap about the correlation between contact quality evolving induced by molecules’ adsorption and friction behaviors of highly sp3-bonded carbons. The results had proved the gas-solid adsorption is responsible for the friction coefficients diversity of ultra-nanocrystalline diamond and diamond-like carbons in different atmospheres. This study emphasized the role of terminal states in friction coefficients, and demonstrated that electron lubricant is another available strategy for hydrogenated diamond-like carbons to achieve ultra-low friction besides its intrinsic reasons. And this conclusion was then validated by the ultra-low friction coefficient (~0.009) of hydrogenated diamond-like carbons in dry nitrogen atmosphere. These findings provided atomic scale descriptions of surface passivation mechanism for ultra-nanocrystalline diamond and diamond-like carbons, which contributed to understanding their macro-scale friction behaviors.

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Publication details

The article was received on 06 Feb 2018, accepted on 04 Jun 2018 and first published on 04 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP00859K
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Ultra-low friction mechanism of highly sp3-hybrid amorphous carbon controlled by interfacial molecules adsorptions

    J. Shi, T. Xia, C. Wang, K. Yuan and J. Zhang, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP00859K

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