Title: UItra-low friction and edge-pinning effect in large-lattice-mismatch van der Waals heterostructures
Authors: Liao, Mengzhou
Nicolini, Paolo
Du, Luojun
Yuan, Jiahao
Wang, Shuopei
Yu, Hua
Tang, Jian
Cheng, Peng
Watanabe, Kenji
Taniguchi, Takashi
Gu, Lin
Claerbout, Victor E.P.
Silva, Andrea
Kramer, Denis 
Polcar, Tomas
Yang, Rong
Shi, Dongxia
Zhang, Guangyu
Language: en
Subject (DDC): DDC::500 Naturwissenschaften und Mathematik::530 Physik::531 Klassische Mechanik, Festkörpermechanik
Issue Date: 5-Aug-2021
Publisher: Nature Publishing Group
Document Type: Article
Journal / Series / Working Paper (HSU): Nature Materials 
Volume: 21
Issue: 1
Page Start: 47
Page End: 53
Publisher Place: Basingstoke
Abstract: 
Two-dimensional heterostructures are excellent platforms to realize twist-angle-independent ultra-low friction due to their weak interlayer van der Waals interactions and natural lattice mismatch. However, for finite-size interfaces, the effect of domain edges on the friction process remains unclear. Here we report the superlubricity phenomenon and the edge-pinning effect at MoS2/graphite and MoS2/hexagonal boron nitride van der Waals heterostructure interfaces. We found that the friction coefficients of these heterostructures are below 10−6. Molecular dynamics simulations corroborate the experiments, which highlights the contribution of edges and interface steps to friction forces. Our experiments and simulations provide more information on the sliding mechanism of finite low-dimensional structures, which is vital to understand the friction process of laminar solid lubricants.
Organization Units (connected with the publication): Computational Material Design 
ISSN: 1476-1122
DOI: 10.1038/s41563-021-01058-4
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