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首页> 外文期刊>ACS nano >Interlayer Friction and Superlubricity in Single-Crystalline Contact Enabled by Two-Dimensional Flake-Wrapped Atomic Force Microscope Tips
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Interlayer Friction and Superlubricity in Single-Crystalline Contact Enabled by Two-Dimensional Flake-Wrapped Atomic Force Microscope Tips

机译:通过二维薄片包裹的原子力显微镜提示使单晶触头中的层间摩擦和超润滑性

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摘要

Interlayer friction between the atomic planes of 2D materials and heterostructures is a promising probe of the physics in their interlayer couplings and superlubricity. However, it is still challenging to measure the interlayer friction between well-defined 2D layers. We propose an approach of thermally assisted mechanical exfoliation and transfer to fabricate various 2D flake-wrapped atomic force microscopy (AFM) tips and to directly measure the interlayer friction between 2D flakes in single-crystalline contact. First, superlubricity between different 2D flakes and layered bulk materials is achieved with a friction coefficient as low as 10(-4). The rotation angle dependence of superlubricity is observed for friction between graphite layers, whereas it is not observed between graphite and h-BN because of the incommensurate contact of the mismatched lattices. Second, the interlayer lateral force map between ReS2 layers is measured with atomic resolution, showing hexagonal patterns, as further verified by theoretical simulations. The tribological system constructed here offers an experimental platform to study interlayer couplings and friction between 2D flakes and layered bulk materials.
机译:2D材料的原子平面与异质结构之间的层间摩擦是其层间联轴器和超级润滑性的物理学的有希望的探针。然而,测量明确定义的2D层之间的层间摩擦仍然具有挑战性。我们提出了一种热辅助机械剥离和转移的方法,以制造各种2D片状包裹的原子力显微镜(AFM)提示,并直接测量单晶接触中的2D薄片之间的层间摩擦。首先,使用低至10(-4)的摩擦系数实现不同的2D薄片和层状散装材料之间的超级润滑性。对于石墨层之间的摩擦,观察超润滑性的旋转角度依赖性,而由于错配的格子的不称除接触,因此在石墨和H-BN之间未观察到。其次,以原子分辨率测量RES2层之间的层间侧向力图,示出了六边形图案,如通过理论模拟进一步验证。此处构建的摩擦系统提供了一种实验平台,用于研究2D片和层状散装材料之间的层间联轴器和摩擦。

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