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Research Article | Open Access

Macro-superlubricity in sputtered MoS2-based films by decreasing edge pinning effect

Chunmeng DONG1,2, Dong JIANG1, Yanlong FU1, Desheng WANG1, Qinqin WANG1, Lijun WENG1,2, Ming HU1,2, Xiaoming GAO1,2, Jiayi SUN1,2( )
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

To date, MoS2 can only be achieved at microscale. Edge pinning effect caused by structure defects is the most obvious barrier to expand the size of structural superlubricity to macroscale. Herein, we plan to pin edge planes of MoS2 with nanospheres, and then the incommensurate structure can be formed between adjacent rolling nanoparticles to reduce friction. The sputtered MoS2 film was prepared by the physical vapor deposition (PVD) in advance. Then enough Cu2O nanospheres (~40 nm) were generated in situ at the edge plane of MoS2 layers by liquid phase synthesis. An incommensurate structure (mismatch angle (θ) = 8°) caused by MoS2 layers was formed before friction. The friction coefficient of the films (5 N, 1,000 r/min) was ~6.0×10−3 at the most. During friction, MoS2 layers pinned on numerous of Cu2O nanoparticles reduced its edge pinning effect and decreased friction. Moreover, much more incommensurate was formed, developing macro-superlubricity.

Keywords

sputtered MoS2 filmCu2O nanospheresedge pinning effectmacro-superlubricity

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Friction
Volume 12 Issue 1,
January 2024
Pages 52-63
DOI: 10.1007/s40544-022-0728-0
Cite this article:
DONG C, JIANG D, FU Y, et al. Macro-superlubricity in sputtered MoS2-based films by decreasing edge pinning effect. Friction, 2024, 12(1): 52-63. https://doi.org/10.1007/s40544-022-0728-0

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Received: 17 June 2022
Revised: 21 September 2022
Accepted: 26 November 2022
Published: 13 April 2023
© The author(s) 2022.

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