Defects controlled wrinkling and topological design in graphene

Teng Zhang, Xiaoyan Li, Huajian Gao

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

Due to its atomic scale thickness, the deformation energy in a free standing graphene sheet can be easily released through out-of-plane wrinkles which, if controllable, may be used to tune the electrical and mechanical properties of graphene. Here we adopt a generalized von Karman equation for a flexible solid membrane to describe graphene wrinkling induced by a prescribed distribution of topological defects such as disclinations (heptagons or pentagons) and dislocations (heptagon-pentagon dipoles). In this framework, a given distribution of topological defects in a graphene sheet is represented as an eigenstrain field which is determined from a Poisson equation and can be conveniently implemented in finite element (FEM) simulations. Comparison with atomistic simulations indicates that the proposed model, with only three parameters (i.e., bond length, stretching modulus and bending stiffness), is capable of accurately predicting the atomic scale wrinkles near disclination/dislocation cores while also capturing the large scale graphene configurations under specific defect distributions such as those leading to a sinusoidal surface ruga2 or a catenoid funnel.

Original languageEnglish (US)
Pages (from-to)2-13
Number of pages12
JournalJournal of the Mechanics and Physics of Solids
Volume67
Issue number1
DOIs
StatePublished - Jul 2014

Keywords

  • Curvature
  • Graphene
  • Incompatible growth metric field
  • Topological defects
  • von Karman equation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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