Transforming amorphous carbon into graphene by current-induced annealing

Details Transforming amorphous carbon into graphene by current-induced annealing Transforming amorphous carbon into graphene by current-induced annealing

2012-01-15

arxiv.org/abs/1201.3131v1

Physics

Condensed Matter

Materials Science

Scientific paper

We report on the catalyst-free growth of graphene from amorphous carbon (a-C) by current-induced annealing. This is a novel mechanism that we could witness by in-situ transmission electron microscopy and simulate with molecular dynamics calculations. We observe that small a-C clusters on a graphene substrate rearrange and crystallize into graphene patches due to the high temperatures involved and van-der-Waals interactions with the substrate. Furthermore, we report that in the presence of a-C, graphene can grow from the borders of holes in graphene, healing them out completely. These findings open up new avenues for bottom-up engineering of graphene-based devices.

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