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Nano-friction behavior of phosphorene

机译：磷烯的纳米摩擦行为

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摘要

Nano-friction of phosphorene plays a significant role in affecting the controllability and efficiency of applying strain engineering to tune its properties. So far, the friction behavior of phosphorene has not been studied. This work studies the friction of single-layer and bilayer phosphorene on an amorphous silicon substrate by sliding a rigid tip. For the single-layer phosphorene, it is found that its friction is highly anisotropic, i.e. the friction is larger along the armchair direction than that along the zigzag direction. Moreover, pre-strain of the phosphorene also exhibits anisotropic effects. The friction increases with the pre-strain along the zigzag direction, but decreases with that along the armchair direction. Furthermore, the strong adhesion between the phosphorene and its substrate increases the friction between the phosphorene and the tip. For bilayer phosphorene, its friction highly depends on its stacking mode, which determines the contact interface with a commensurate or incommensurate pattern. This friction behavior is quite unique and greatly differs from that of graphene and molybdenum disulfide. Detailed analysis reveals that this behavior results from the combination effect of the friction contact area, the potential-energy profile of phosphorene, and its unique elongation.
机译：碱摩擦磷烯在影响施加应变工程的可控性和效率调节其性质的可控性和效率方面发挥着重要作用。到目前为止，尚未研究磷烯的摩擦行为。这项工作通过滑动刚性尖端来研究单层和双层磷烯的摩擦，通过滑动尖端。对于单层磷烯，发现其摩擦是高度各向异性的，即沿扶手椅方向沿沿曲线方向较大。此外，磷烯的预株也表现出各向异性效应。摩擦随着沿曲折方向的预应变而增加，但沿扶手椅方向减小。此外，磷烯及其基材之间的强粘附增加了磷烯和尖端之间的摩擦。对于双层磷烯，其摩擦高度取决于其堆叠模式，其确定具有相应或不称称模式的接触界面。这种摩擦行为非常独特，极大地与石墨烯和二硫化钼的不同。详细分析表明，这种行为是由摩擦接触面积，磷烯潜在能量曲线的组合效果产生的，以及其独特的伸长率。

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