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

Abstract:

: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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Liu SW,Wang HP,Xu Q,Ma TB,Yu G,Zhang C,Geng D,Yu Z,Zhang S,Wang W,Hu YZ,Wang H,Luo J

doi

10.1038/ncomms14029

subject

Has Abstract

pub_date

2017-02-14 00:00:00

pages

14029

issn

2041-1723

pii

ncomms14029

journal_volume

8

pub_type

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