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arXiv · 2309.16079

Experimental observation of highly anisotropic elastic properties of two-dimensional black arsenic

Jingjing Zhang·Shang Chen·Guoshuai Du·Yunfei Yu·Wuxiao Han·Qinglin Xia·Ke Jin·Yabin Chen
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Abstract

Anisotropic two-dimensional layered materials with low-symmetric lattices have attracted increasing attention due to their unique orientation-dependent mechanical properties. Black arsenic (b-As), with the puckered structure, exhibits extreme in-plane anisotropy in optical, electrical and thermal properties. However, experimental research on mechanical properties of b-As is very rare, although theoretical calculations predicted the exotic elastic properties of b-As, such as anisotropic Young's modulus and negative Poisson's ratio. Herein, experimental observations on highly anisotropic elastic properties of b-As were demonstrated using our developed in situ tensile straining setup based on the effective microelectromechanical system. The cyclic and repeatable load-displacement curves proved that Young's modulus along zigzag direction was ~1.6 times greater than that along armchair direction, while the anisotropic ratio of ultimate strain reached ~2.5, attributed to hinge structure in armchair direction. This study could provide significant insights to design novel anisotropic materials and explore their potential applications in nanomechanics and nanodevices.

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Jingjing Zhang, Shang Chen, Guoshuai Du, Yunfei Yu, Wuxiao Han, Qinglin Xia, Ke Jin, Yabin Chen. 2023-09-28. Experimental observation of highly anisotropic elastic properties of two-dimensional black arsenic. https://arxiv.org/abs/2309.16079

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