Journal
NANO LETTERS
Volume 11, Issue 6, Pages 2259-2263Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl200429f
Keywords
Graphene; grain boundaries; AFM; membranes; CVD; molecular dynamics simulations
Categories
Funding
- NSF through the Cornell Center for Materials Research
- AFOSR-PECASE
- Cornell University
- CONACyT-Mexico
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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.
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