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Nano Lett. 2011 Jun 8;11(6):2259-63. doi: 10.1021/nl200429f. Epub 2011 Apr 29.

Softened elastic response and unzipping in chemical vapor deposition graphene membranes.

Author information

1
School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States.

Abstract

We use atomic force microscopy to image grain boundaries and ripples in graphene membranes obtained by chemical vapor deposition. Nanoindentation measurements reveal that out-of-plane ripples effectively soften graphene's in-plane stiffness. Furthermore, grain boundaries significantly decrease the breaking strength of these membranes. Molecular dynamics simulations reveal that grain boundaries are especially weakening when subnanometer voids are present in the lattice. Finally, we demonstrate that two graphene membranes brought together form membranes with higher resistance to breaking.

PMID:
21528894
DOI:
10.1021/nl200429f
[Indexed for MEDLINE]

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