1. Geim, A. K. & Novoselov, K. S. The rise of graphene. Nature Materials 6, 183–91 (2007).
2. Meyer, J. C. et al. The structure of suspended graphene sheets. Nature 446, 60–63 (2007).
3. Wu, Y. H., Yu, T. & Shen, Z. X. Two-dimensional carbon nanostructures: Fundamental properties, synthesis, characterization, and potential applications. J. Appl. Phys. 108, 071301 (2010).
4. Jo, G. et al. The application of graphene as electrodes in electrical and optical devices. Nanotechnology 23, 112001 (2012).
5. Yurum, Y., Taralp, A. & Veziroglu, N. Storage of hydrogen in nanostructured carbon materials. Int. J. Hydrogen Energy 34, 3784–3798 (2009).