Ultrahard carbon film from epitaxial two-layer graphene

@article{Gao2017UltrahardCF,
  title={Ultrahard carbon film from epitaxial two-layer graphene},
  author={Yang Gao and Tengfei Cao and Filippo Cellini and Claire Berger and Walt A. de Heer and Erio Tosatti and Elisa Riedo and Angelo Bongiorno},
  journal={Nature Nanotechnology},
  year={2017},
  volume={13},
  pages={133-138}
}
Atomically thin graphene exhibits fascinating mechanical properties, although its hardness and transverse stiffness are inferior to those of diamond. So far, there has been no practical demonstration of the transformation of multilayer graphene into diamond-like ultrahard structures. Here we show that at room temperature and after nano-indentation, two-layer graphene on SiC(0001) exhibits a transverse stiffness and hardness comparable to diamond, is resistant to perforation with a diamond… 

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    Proceedings of the National Academy of Sciences
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