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Research Article | Open Access

Functionalized graphene-oxide nanosheets with amino groups facilitate macroscale superlubricity

Xiangyu GE1, Zhiyuan CHAI1, Qiuyu SHI2, Jinjin LI3 ( ), Jiawei TANG1, Yanfei LIU1, Wenzhong WANG1
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
State Grid Smart Grid Research Institute Co., Ltd., Beijing 102209, China
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
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Graphical Abstract

Abstract

Graphene-oxide (GO) has been recognized as an excellent lubrication material owing to its two-dimensional structure and weak interlayer interactions. However, the functional groups of GO that can contribute to anti-friction, anti-wear, and superlubricity are yet to be elucidated. Hence, further improvement in GO-family materials in tribology and superlubricity fields is impeded. In this study, macroscale superlubricity with a coefficient of friction of less than 0.01 is achieved by exploiting the high adhesive force between amino groups within aminated GO (GO–NH2) nanosheets and SiO2. It was observed that GO–NH2 nanosheets form a robust adsorption layer on the worn surfaces owing to the high adsorption of amino groups. This robust GO–NH2 adsorption layer not only protects the contact surfaces and contributes to low wear, but also causes the shearing plane to transform constantly from solid asperities (high friction) into GO–NH2 interlayers (weak interlayer interactions), resulting in superlubricity. A SiO2-containing boundary layer formed by tribochemical reactions and a liquid film are conducive to low friction. Such macroscale liquid superlubricity provides further insights into the effect of functional groups within functionalized GO materials and a basis for designing functionalized GO materials with excellent tribological performances.

Keywords

functionalized graphene-oxideaminated graphene-oxidesuperlubricityanti-friction and anti-wear

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Friction
Volume 11 Issue 2,
February 2023
Pages 187-200
DOI: 10.1007/s40544-021-0583-4
Cite this article:
GE X, CHAI Z, SHI Q, et al. Functionalized graphene-oxide nanosheets with amino groups facilitate macroscale superlubricity. Friction, 2023, 11(2): 187-200. https://doi.org/10.1007/s40544-021-0583-4

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Received: 08 October 2021
Revised: 19 November 2021
Accepted: 04 December 2021
Published: 25 April 2022
© The author(s) 2021.

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