Abstract
The extremely low friction between incommensurate two-dimensional (2D) materials has drawn more attention in the recent years. Structural superlubricity is a fascinating tribological phenomenon that is achieved in 2D heterojunctions despite the aligned or misaligned contacts that occur due to the disappearance of the lateral interactions between two incommensurate contacting surfaces. In this study, using the first-principles method, we report the computational realization of structural superlubricity for graphene/antimonene heterojunctions at the nanoscale. The calculated results clearly demonstrate that structural superlubricity between graphene and antimonene monolayers could be achieved under the misaligned contacts. The structural superlubricity is mainly attributed to lower work of separation, which maintains superlow friction coefficients.
Highlights
The Unusual Tribological PropertiesRecently, two-dimensional (2D) materials, such as graphene and MS2 (M = W andMo) have exhibited excellent tribological performance [1,2] due to their unique layered structure
We found that the work of separation (Wsep ) played an important role in obtaining superlow friction coefficient
We found that structural superlubricity can be achieved betimonene heterojunctions
Summary
Mo) have exhibited excellent tribological performance [1,2] due to their unique layered structure. Mandelli and Leven et al pointed out that graphene/h-BN heterojunctions would be a route to robust superlubricity [8,9] They declared that the enhanced incommensurability effects would greatly reduce the friction coefficient in misaligned contacts. The robust microscale superlubricity in graphite/h-BN layered heterojunctions was found by Song et al [10] They demonstrated that structural superlubricity could be maintained, even when the aligned contact applied external loads. Antimonene is a special 2D material, and if 2D heterojunctions were built with graphene, one may naturally wonder: could structural superlubricity be achieved?. Motivated by our previous work [11], we used the first-principles method to investigate the properties of graphene/antimonene heterojunctions, which focused on their structural superlubricity. Behavior to exto explain what the most important factors for structural superlubricity between graphene plain what the most important factors for structural superlubricity between graphene and and antimonene antimonene were.were
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