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http://dx.doi.org/10.9725/kts.2019.35.4.199

Frictional Properties of Two-dimensional Materials against Spherical and Flat AFM Tips  

Tran-Khac, Bien-Cuong (School of Mechanical Engineering, University of Ulsan)
Chung, Koo-Hyun (School of Mechanical Engineering, University of Ulsan)
Publication Information
Tribology and Lubricants / v.35, no.4, 2019 , pp. 199-205 More about this Journal
Abstract
Two-dimensional materials such as graphene, h-BN, and $MoS_2$ have attracted increased interest as solid lubricant and protective coating layer for nanoscale devices owing to their superior mechanical properties and low friction characteristics. In this work, the frictional properties of single-layer graphene, h-BN, and $MoS_2$ are experimentally investigated under various normal forces using atomic force microscope (AFM) tips with a spherical and flat end, with the aim to gain a better understanding of frictional behaviors. The nonlinear relationship between friction and normal force friction was clearly observed for single-layer graphene, h-BN, $MoS_2$ specimens slid against the spherical and flat AFM tips. The results also indicate that single-layer graphene, h-BN, $MoS_2$ exhibit low frictional properties (e.g., friction coefficient below 0.1 under 70~100 nN normal force). In particular, graphene is found to be superior to h-BN and $MoS_2$ in terms of frictional properties. However, the friction of single-layer graphene, h-BN, $MoS_2$ against the flat tip is larger than that against the spherical tip, which may be attributed to the relatively large adhesion. Furthermore, it is shown that the fluctuation of friction is more significant for the flat tip than the spherical tip. The resutls of this study may be helpful to elucidate the feasibility of using two-dimensional materials as solid lubricant and protective coating layer for nanoscale devices.
Keywords
adhesion; atomic force microscopy; friction; graphene; h-BN; $MoS_2$;
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