Mechanical Anisotropy in Two-Dimensional Selenium Atomic Layers

Jing Kai Qin, Chao Sui, Zhao Qin, Jianyang Wu, Hua Guo, Liang Zhen, Cheng Yan Xu, Yang Chai, Chao Wang, Xiaodong He, Peide D. Ye, Jun Lou

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)8043-8050
Number of pages8
JournalNano Letters
Volume21
Issue number19
DOIs
StatePublished - Oct 13 2021

Keywords

  • 2D t-Se nanosheets
  • anisotropic mechanical properties
  • DFT calculation
  • in situ nanomechanical testing
  • MD simulation

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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