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In-situ formation of spherical MoS2 nanoparticles for ultra-low friction

Abstract

The motion resistance and energy dissipation of rolling friction are much lower than sliding friction at macroscale. But at microscale, the impact of rolling on friction remains an open question. Here, we show that spherical MoS2 nanoparticles can be formed in-situ at friction interface by scrolling and wrapping of MoS2 nanosheets under the induction of reciprocating shear stress when a MoS2 coating constructed by loosely stacked nanosheets is tested in vacuum of 3.5×10-3 Pa. An ultra-low friction state can be readily realized with the friction coefficients of 0.004-0.006 which are one order of magnitude lower than that of pulse laser deposited MoS2 coating without nanoparticles formed in friction process. Accordingly, the spherical nanoparticles are highlighted as the key factor for the ultra-low friction. Classical molecular dynamics simulation further reveals that the motion mode of MoS2 nanoparticle is stress-dependent. This finding confirms an access to the ultra-low friction by introducing rolling friction based on microstructure evolution of coating.

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Publication details

The article was received on 12 Aug 2018, accepted on 12 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR06503A
Citation: Nanoscale, 2018, Accepted Manuscript
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    In-situ formation of spherical MoS2 nanoparticles for ultra-low friction

    K. Hou, M. Han, X. Liu, J. Wang, Y. He and S. Yang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR06503A

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