Effect of structural defects and chemical functionalisation on the intrinsic mechanical properties of graphene

Literature Information

Publication Date 2012-11-08
DOI 10.1039/C2CP43033A
Impact Factor 3.676
Authors

Songül Güryel, Balázs Hajgató, Yves Dauphin, Jean-Marie Blairon, Hans Edouard Miltner, Frank De Proft, Paul Geerlings, Gregory Van Lier


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Abstract

Due to its unique mechanical properties, graphene can be applied for reinforcement in nanocomposites. We analyse the Young’s modulus of graphene at the semi-empirical PM6 level of theory. The internal forces are calculated and the Young’s modulus is predicted for a finite graphene sheet when external strain is applied on the system. These results are in a good agreement with theoretical and experimental results from the literature giving values of about 1 TPa for the Young’s modulus. Stress–strain curves are computed for elongation up to 20%. In addition, the influence of the presence of a single vacancy, as well as for oxygenation of a vacancy, on the mechanical properties of graphene has been analysed. Our results indicate that when applying the deformation locally onto the system, higher local stress can be induced, as confirmed by Finite Element Analysis. Also, the presence of structural defects in the system will stiffen the system upon low strain, but reduces the elastic limit from more than 20% strain for pristine graphene to less than 10% strain when defects are present.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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