Song Yiming, Gao Xiang, Pawlak Rémy, Huang Shuyu, Hinaut Antoine, Glatzel Thilo, Hod Oded, Urbakh Michael, Meyer Ernst
Department of Physics, University of Basel, Basel, Switzerland.
Department of Physical Chemistry, School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences and The Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv, Israel.
Nat Commun. 2024 Nov 2;15(1):9487. doi: 10.1038/s41467-024-53581-y.
Against conventional wisdom, corrugated grain boundaries in polycrystalline graphene, grown on Pt(111) surfaces, are shown to exhibit negative friction coefficients and non-monotonic velocity dependence. Using combined experimental, simulation, and modeling efforts, the underlying energy dissipation mechanism is found to be dominated by dynamic buckling of grain boundary dislocation protrusions. The revealed mechanism is expected to appear in a wide range of polycrystalline two-dimensional material interfaces, thus supporting the design of large-scale dry superlubric contacts.
与传统观念相反，生长在Pt(111)表面的多晶石墨烯中的波纹状晶界表现出负摩擦系数和非单调速度依赖性。通过结合实验、模拟和建模工作，发现潜在的能量耗散机制主要由晶界位错突起的动态屈曲主导。预计所揭示的机制将出现在广泛的多晶二维材料界面中，从而为大规模干超润滑接触的设计提供支持。
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