Rotational Friction Correlated with Moiré Patterns in Strained Bilayer Graphene: Implications for Nanoscale Lubrication,ACS Applied Nano Materials

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Rotational Friction Correlated with Moiré Patterns in Strained Bilayer Graphene: Implications for Nanoscale Lubrication
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-09-09 , DOI: 10.1021/acsanm.1c01540
Xing Yang ₁ , Bin Zhang ₁

Affiliation

Energy conservation of graphene nanodevices requires frictional dissipation management for their high surface area to volume rates, and rotational motion besides sliding scenarios appear frequently. Here, the rotational friction between graphene layers is investigated by molecular dynamics simulations with a validated graphene-spring model. It shows that the interlayer frictional torque drops an order of magnitude and approaches superlubricity with the emergence of Moiré patterns (MPs). Further analysis reveals that the incommensurate interface of MPs tunes the local energy, which cancels each other out with relative rotation, resulting in ultralow interlayer energy barriers. Accordingly, for bilayer systems with biaxially stretched substrates, a significant torque reduction can be achieved when the size of MPs matches that of the graphene flake. This study would provide new insight into the lubrication of rotatable nanomechanical systems.

中文翻译：

与应变双层石墨烯中的莫尔图案相关的旋转摩擦：对纳米级润滑的影响

石墨烯纳米器件的能量守恒需要摩擦耗散管理，因为它们的表面积与体积比高，并且除了滑动场景之外的旋转运动经常出现。在这里，石墨烯层之间的旋转摩擦通过分子动力学模拟与经过验证的石墨烯弹簧模型进行研究。它表明，随着莫尔图案 (MP) 的出现，层间摩擦扭矩下降了一个数量级并接近超润滑性。进一步的分析表明，MPs 的不公度界面会调节局部能量，通过相对旋转相互抵消，从而产生超低的层间能垒。因此，对于具有双轴拉伸基材的双层系统，当 MP 的尺寸与石墨烯薄片的尺寸匹配时，可以实现显着的扭矩降低。

更新日期：2021-09-24

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