Graphene reknits its holes.

@article{Bangert2012GrapheneRI,
  title={Graphene reknits its holes.},
  author={Ursel Bangert and Recep Zan and Quentin M. Ramasse and Kostya S. Novoselov},
  journal={Nano letters},
  year={2012},
  volume={12 8},
  pages={
          3936-40
        }
}
Nanoholes, etched under an electron beam at room temperature in single-layer graphene sheets as a result of their interaction with metal impurities, are shown to heal spontaneously by filling up with either nonhexagon, graphene-like, or perfect hexagon 2D structures. Scanning transmission electron microscopy was employed to capture the healing process and study atom-by-atom the regrown structure. A combination of these nanoscale etching and reknitting processes could lead to new graphene… 

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