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Mechanical Anisotropy in Two-Dimensional Selenium Atomic Layers
Nano Letters ( IF 10.8 ) Pub Date : 2021-09-22 , DOI: 10.1021/acs.nanolett.1c02294
Jing-Kai Qin 1, 2, 3 , Chao Sui 1, 4 , Zhao Qin 5 , Jianyang Wu 6 , Hua Guo 4 , Liang Zhen 2 , Cheng-Yan Xu 2 , Yang Chai 7 , Chao Wang 1, 4 , Xiaodong He 1, 8 , Peide D Ye 3 , Jun Lou 4
Affiliation  

Two-dimensional (2D) trigonal selenium (t-Se) has become a new member in 2D semiconducting nanomaterial families. It is composed of well-aligned one-dimensional Se atomic chains bonded via van der Waals (vdW) interaction. The contribution of this unique anisotropic nanostructure to its mechanical properties has not been explored. Here, for the first time, we combine experimental and theoretical analyses to study the anisotropic mechanical properties of individual 2D t-Se nanosheets. It was found that its fracture strength and Young’s modulus parallel to the atomic chain direction are much higher than along the transverse direction, which was attributed to the weak vdW interaction between Se atomic chains as compared to the covalent bonding within individual chains. Additionally, two distinctive fracture modes along two orthogonal loading directions were identified. This work provides important insights into the understanding of anisotropic mechanical behaviors of 2D semiconducting t-Se and opens new possibilities for future applications.

中文翻译:

二维硒原子层的机械各向异性

二维 (2D) 三角硒 ( t -Se) 已成为二维半导体纳米材料家族的新成员。它由通过范德华 (vdW) 相互作用键合的排列良好的一维 Se 原子链组成。尚未探索这种独特的各向异性纳米结构对其机械性能的贡献。在这里,我们第一次结合实验和理论分析来研究单个 2D t的各向异性力学性能-Se 纳米片。发现其平行于原子链方向的断裂强度和杨氏模量远高于沿横向方向,这是由于与单个链内的共价键相比,Se 原子链之间的 vdW 相互作用较弱。此外,还确定了沿两个正交加载方向的两种不同的断裂模式。这项工作为理解二维半导体t- Se的各向异性机械行为提供了重要的见解,并为未来的应用开辟了新的可能性。
更新日期:2021-10-13
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