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Materials 2016, 9(1), 32; doi:10.3390/ma9010032

Buckling Behavior of Substrate Supported Graphene Sheets

1
Institute of Solid Mechanics, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China
2
Department of Aerospace Engineering, University of Illinois, Champaign, IL 61801, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Owen J. Guy
Received: 10 October 2015 / Revised: 8 December 2015 / Accepted: 17 December 2015 / Published: 7 January 2016
(This article belongs to the Special Issue Graphene)
View Full-Text   |   Download PDF [2717 KB, uploaded 7 January 2016]   |  

Abstract

The buckling of graphene sheets on substrates can significantly degrade their performance in materials and devices. Therefore, a systematic investigation on the buckling behavior of monolayer graphene sheet/substrate systems is carried out in this paper by both molecular mechanics simulations and theoretical analysis. From 70 simulation cases of simple-supported graphene sheets with different sizes under uniaxial compression, two different buckling modes are investigated and revealed to be dominated by the graphene size. Especially, for graphene sheets with length larger than 3 nm and width larger than 1.1 nm, the buckling mode depends only on the length/width ratio. Besides, it is revealed that the existence of graphene substrate can increase the critical buckling stress and strain to 4.39 N/m and 1.58%, respectively, which are about 10 times those for free-standing graphene sheets. Moreover, for graphene sheets with common size (longer than 20 nm), both theoretical and simulation results show that the critical buckling stress and strain are dominated only by the adhesive interactions with substrate and independent of the graphene size. Results in this work provide valuable insight and guidelines for the design and application of graphene-derived materials and nano-electromechanical systems. View Full-Text
Keywords: graphene; buckling; molecular mechanics; energy method; nano-electromechanical system graphene; buckling; molecular mechanics; energy method; nano-electromechanical system
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Yang, K.; Chen, Y.; Pan, F.; Wang, S.; Ma, Y.; Liu, Q. Buckling Behavior of Substrate Supported Graphene Sheets. Materials 2016, 9, 32.

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