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Issue 35, 2018
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Ultra-low friction mechanism of highly sp3-hybridized amorphous carbon controlled by interfacial molecule adsorption

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Abstract

The friction behaviors of highly sp3-hybridized carbon films, including ultra-nanocrystalline diamond and diamond-like carbon materials, strongly depend on the atmosphere. However, the roles of the corresponding molecules in the interfacial bonding characteristics remain a subject of debate. By means of density functional theory calculations, this study aims to fill a knowledge gap about the correlation between the evolving contact quality induced by the adsorption of molecules, and the friction behavior of highly sp3-bonded carbons. The results prove that gas–solid adsorption is responsible for the diversity in friction coefficients of ultra-nanocrystalline diamond and diamond-like carbons in different atmospheres. This study emphasizes the role of terminal states in friction coefficients, and demonstrates that electron lubrication is another available strategy for hydrogenated diamond-like carbons to achieve ultra-low friction. This conclusion is validated by the ultra-low friction coefficient (∼0.009) of hydrogenated diamond-like carbons in a dry nitrogen atmosphere. These findings provide atomic scale descriptions of the surface passivation mechanisms for ultra-nanocrystalline diamond and diamond-like carbons, which contribute to our understanding of their macro-scale friction behaviors.

Graphical abstract: Ultra-low friction mechanism of highly sp3-hybridized amorphous carbon controlled by interfacial molecule adsorption

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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., 2018,20, 22445-22454
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    Ultra-low friction mechanism of highly sp3-hybridized amorphous carbon controlled by interfacial molecule adsorption

    J. Shi, T. Xia, C. Wang, K. Yuan and J. Zhang, Phys. Chem. Chem. Phys., 2018, 20, 22445
    DOI: 10.1039/C8CP00859K

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