Effect of defects on the intrinsic strength and stiffness of graphene

Ardavan Zandiatashbar, Gwan-Hyoung Lee, Sung Joo An, Sunwoo Lee, Nithin Mathew, Mauricio Terrones, Takuya Hayashi, Catalin R. Picu (), James Hone () and Nikhil Koratkar ()
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Ardavan Zandiatashbar: Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute
Gwan-Hyoung Lee: Columbia University
Sung Joo An: Columbia University
Sunwoo Lee: Columbia University
Nithin Mathew: Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute
Mauricio Terrones: The Pennsylvania State University
Takuya Hayashi: Faculty of Engineering and Research Center for Exotic Nanocarbons, Shinshu University
Catalin R. Picu: Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute
James Hone: Columbia University
Nikhil Koratkar: Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract It is important from a fundamental standpoint and for practical applications to understand how the mechanical properties of graphene are influenced by defects. Here we report that the two-dimensional elastic modulus of graphene is maintained even at a high density of sp3-type defects. Moreover, the breaking strength of defective graphene is only ~14% smaller than its pristine counterpart in the sp3-defect regime. By contrast, we report a significant drop in the mechanical properties of graphene in the vacancy-defect regime. We also provide a mapping between the Raman spectra of defective graphene and its mechanical properties. This provides a simple, yet non-destructive methodology to identify graphene samples that are still mechanically functional. By establishing a relationship between the type and density of defects and the mechanical properties of graphene, this work provides important basic information for the rational design of composites and other systems utilizing the high modulus and strength of graphene.

Date: 2014
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DOI: 10.1038/ncomms4186

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