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ACS Nano. 2010 Oct 26;4(10):6114-20. doi: 10.1021/nn101822s.

Nickel-assisted healing of defective graphene.

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Laboratoire d'Etude des Microstructures, ONERA-CNRS, BP 72, 92322 Ch√Ętillon Cedex, France.


The healing of graphene grown from a metallic substrate is investigated using tight-binding Monte Carlo simulations. At temperatures (ranging from 1000 to 2500 K), an isolated graphene sheet can anneal a large number of defects suggesting that their healings are thermally activated. We show that in the presence of a nickel substrate we obtain a perfect graphene layer. The nickel-carbon chemical bonds keep breaking and reforming around defected carbon zones, providing a direct interaction, necessary for the healing. Thus, the action of Ni atoms is found to play a key role in the reconstruction of the graphene sheet by annealing defects.


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