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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We are grateful to B. J. Irving for carefully reading the manuscript. G.Z. thanks the National Science Foundation of China (NSFC, grant nos 11834017 and 61888102) and the Strategic Priority Research Program of CAS (grant no. XDB30000000) for their support. M.L. thanks the ESI Fund and the OPR DE International Mobility of Researchers MSCA-IF III at CTU in Prague (no. CZ.02.2.69/0.0/0.0/20_079/0017983) for their support. L.D. gratefully acknowledges the financial support from the Academy of Finland (grant no. 3333099). D.S. thanks the support from NSFC (grant no. 61734001). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, A3 Foresight by JSPS and the CREST (JPMJCR15F3), JST. M.L., P.N. and T.P. acknowledge support from the project Novel Nanostructures for Engineering Applications CZ.02.1.01/0.0/0.0/16_026/0008396. This work was supported by the Ministry of Education, Youth and Sports of the Czech Republic through the e-INFRA CZ (ID:90140). T.P., V.E.P.C. and A.S. acknowledge support from the European Union’s Horizon 2020 research and innovation program under grant agreement no. 721642: SOLUTION. The data and materials are available from the corresponding authors upon request. The authors acknowledge the use of the IRIDIS High Performance Computing Facility, and associated support services at the University of Southampton, in the completion of this work.
The authors declare no competing interests.
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Liao, M., Nicolini, P., Du, L. et al. UItra-low friction and edge-pinning effect in large-lattice-mismatch van der Waals heterostructures. Nat. Mater. 21, 47–53 (2022). https://doi.org/10.1038/s41563-021-01058-4
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