UItra-low friction and edge-pinning effect in large-lattice-mismatch van der Waals heterostructures
Publication date
2021-08-05
Document type
Research article
Author
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
Polcar, Tomas
Yang, Rong
Shi, Dongxia
Zhang, Guangyu
Organisational unit
ISSN
Series or journal
Nature Materials
Periodical volume
21
Periodical issue
1
First page
47
Last page
53
Peer-reviewed
✅
Part of the university bibliography
✅
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.
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