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Robust microscale superlubricity under high contact pressure enabled by graphene-coated microsphere

Superlubricity of graphite and graphene has aroused increasing interest in recent years. Yet how to obtain a long-lasting superlubricity between graphene layers, under high applied normal load in ambient atmosphere still remains a challenge but is highly desirable. Here, we report a direct measureme...

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Detalles Bibliográficos
Autores principales: Liu, Shu-Wei, Wang, Hua-Ping, Xu, Qiang, Ma, Tian-Bao, Yu, Gui, Zhang, Chenhui, Geng, Dechao, Yu, Zhiwei, Zhang, Shengguang, Wang, Wenzhong, Hu, Yuan-Zhong, Wang, Hui, Luo, Jianbin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5316838/
https://www.ncbi.nlm.nih.gov/pubmed/28195130
http://dx.doi.org/10.1038/ncomms14029
Descripción
Sumario:Superlubricity of graphite and graphene has aroused increasing interest in recent years. Yet how to obtain a long-lasting superlubricity between graphene layers, under high applied normal load in ambient atmosphere still remains a challenge but is highly desirable. Here, we report a direct measurement of sliding friction between graphene and graphene, and graphene and hexagonal boron nitride (h-BN) under high contact pressures by employing graphene-coated microsphere (GMS) probe prepared by metal-catalyst-free chemical vapour deposition. The exceptionally low and robust friction coefficient of 0.003 is accomplished under local asperity contact pressure up to 1 GPa, at arbitrary relative surface rotation angles, which is insensitive to relative humidity up to 51% RH. This ultralow friction is attributed to the sustainable overall incommensurability due to the multi-asperity contact covered with randomly oriented graphene nanograins. This realization of microscale superlubricity can be extended to the sliding between a variety of two-dimensional (2D) layers.