Graphane
Graphane is a 2-dimensional polymer of carbon and hydrogen with the formula unit (CH)n where n is large. Graphane's carbon bonds are in sp3 configuration, as opposed to graphene's sp2 bond configuration, thus graphane is a 2-D analog of cubic diamond. Graphane is hydrogenated graphene. Its production was reported in 2009.
Full hydrogenation from both sides of graphene sheet results in graphane[1], but partial hydrogenation leads to hydrogenated graphene.[2]
If graphene rests on a silica surface, hydrogenation on only one side of graphene preserves the hexagonal symmetry in graphane. One-sided hydrogenation of graphene becomes possible due to the existence of ripplings. Since the latter are distributed randomly, obtained graphane is expected to be disordered material in contrast to two-sided graphane.[2] Annealing allows the hydrogen to disperse, reverting to graphene.[3]
p-doped graphane is postulated to be a high temperature BCS theory superconductor with a Tc above 90K [4]
References
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- ↑ Sofo, Jorge O.; et al. (2007). "Graphane: A two-dimensional hydrocarbon". Physical Review B. 75 (15): 153401–4. doi:10.1103/PhysRevB.75.153401.
- ↑ 2.0 2.1 D. C. Elias; et al. (2009). "Control of Graphene's Properties by Reversible Hydrogenation: Evidence for Graphane". Science. 323 (5914): 610. doi:10.1126/science.1167130. PMID 19179524.
- ↑ Kostya Novoselov. "Beyond the wonder material." Physics World August 2009, 27-30.
- ↑ G. Savini; et al. "Doped graphane: a prototype high-Tc electron-phonon superconductor"., http://arxiv.org/PS_cache/arxiv/pdf/1002/1002.0653v1.pdf
