We have observed and analyzed the fracture characteristics of the monolayer CVD-graphene using pressure bulge testing setup. The monolayer CVD-graphene has appeared to undergo environmentally assisted subcritical crack growth in room condition, i.e. stress corrosion cracking arising from the adsorption of water vapor on the graphene and the subsequent chemical reactions. The crack propagation in graphene has appeared to be able to be reasonably tamed by adjusting applied humidity and stress. The fracture toughness, describing the ability of a material containing inherent flaws to resist catastrophic failure, of the CVD-graphene has turned out to be exceptionally high, as compared to other carbon based 3D materials. These results imply that the CVD-graphene could be an ideal candidate as a structural material notwithstanding environmental susceptibility. In addition, the measurements reported here suggest that specific non-continuum fracture behaviors occurring in 2D monoatomic structures can be macroscopically well visualized and characterized.
Bibliographical noteFunding Information:
This research was supported by the Industrial Core Technology Development Programs of the Korean Ministry of Knowledge Economy (grant 10033309), National Platform Technology Programs of the Korean Ministry of Knowledge Economy (grant 10034751), the Center for Nanoscale Mechatronics and Manufacturing, one of the 21st Century Frontier Research Programs of the Korean Ministry of Education, Science and Technology, and Innovative Research Programs of Korea Institute of Machinery and Materials.
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