First-principles calculations combined with friction models to predict the moiré pattern effect on the interlayer friction of two-dimensional materials

材料科学 打滑(空气动力学) 工作(物理) 石墨烯 异质结 凝聚态物理 复合材料 机械 纳米技术 热力学 物理 光电子学
作者
Qizhou Zhang,Weihong Qi,Kewei Tang,Guoliang Ru,Weimin Liu
出处
期刊:Tribology International [Elsevier]
卷期号:: 109087-109087
标识
DOI:10.1016/j.triboint.2023.109087
摘要

Moiré patterns formed by twisting and heterojunction formation have significant regulatory effects on frictional behavior, but no work has studied them through first-principles calculations combined with friction equations. In this paper, we studied the interlayer frictional properties of graphene/graphene (G/G) and graphene/hexagonal boron nitride (G/hBN) systems at different twist angles using first principles combined with the Prandtl-Tomlinson (PT), Frenkel-Kontorova (FK) and Frenkel-Kontorova-Tomlinson (FKT) models. The Moiré patterns formed by twisting and heterojunctions help to reduce the energy barrier of the system’s potential energy surface (PES), thereby reducing the friction force. The stick-slip processes of the friction system are related to the energy barrier, and the reduction in the energy barrier helps transition from stick-slip to continuous sliding. The calculation results of friction models are highly consistent with reported experimental results, showing that twisting and heterojunction formation significantly reduce frictional force. Among the three models, the PT model is better in describing superlubricity during incommensurate contact. This work deepens the understanding of Moiré pattern regulation of frictional behavior and proposes a new method using a friction model combined with first principles to study frictional phenomena.

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