Temperature dependent elastic constants and ultimate strength of graphene and graphyne

Tianjiao Shao, Bin Wen, Roderick Melnik, Shan Yao, Yoshiyuki Kawazoe, Yongjun Tian

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Based on the first principles calculation combined with quasi-harmonic approximation in this work, we focus on the analysis of temperature dependent lattice geometries, thermal expansion coefficients, elastic constants, and ultimate strength of graphene and graphyne. For the linear thermal expansion coefficient, both graphene and graphyne show a negative region in the low temperature regime. This coefficient increases up to be positive at high temperatures. Graphene has superior mechanical properties with Youngs modulus E 350.01 Nm and ultimate tensile strength of 119.2 GPa at room temperature. Based on our analysis, it is found that graphenes mechanical properties have strong resistance against temperature increase up to 1000 K. Graphyne also shows good mechanical properties with Youngs modulus E 250.9 Nm and ultimate tensile strength of 81.2 GPa at room temperature, but graphynes mechanical properties have a weaker resistance with respect to the increase of temperature than that of graphene.

Original languageEnglish
Article number194901
JournalJournal of Chemical Physics
Volume137
Issue number19
DOIs
Publication statusPublished - 2012 Nov 21

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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