Graphane
| Graphane | |
|---|---|
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| Identifiers | |
| CAS number | 1221743-01-6  |
| Properties | |
| Molecular formula | (CH)n |
| Molar mass | Variable |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Graphane is a 2-dimensional polymer of carbon and hydrogen with the formula unit (CH)n where n is large. Graphane should not be confused with graphene, a 2-dimensional form of carbon alone. Graphane is a form of hydrogenated graphene. 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.
The first theoretical description of graphane was reported in 2003[1] and its preparation was reported in 2009.
Full hydrogenation from both sides of a graphene sheet results in graphane,[2] but partial hydrogenation leads to hydrogenated graphene.[3]
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.[3] Annealing allows the hydrogen to disperse, reverting to graphene.[4]
p-doped graphane is postulated to be a high temperature BCS theory superconductor with a Tc above 90 K.[5]
[edit] References
- ^ Sluiter, Marcel; Kawazoe, Yoshiyuki (2003). "Cluster expansion method for adsorption: Application to hydrogen chemisorption on graphene". Physical Review B 68 (8): 085410. Bibcode 2003PhRvB..68h5410S. doi:10.1103/PhysRevB.68.085410.
- ^ Sofo, Jorge O. et al. (2007). "Graphane: A two-dimensional hydrocarbon". Physical Review B 75 (15): 153401–4. arXiv:cond-mat/0606704. Bibcode 2007PhRvB..75o3401S. doi:10.1103/PhysRevB.75.153401.
- ^ a b D. C. Elias et al. (2009). "Control of Graphene's Properties by Reversible Hydrogenation: Evidence for Graphane". Science 323 (5914): 610–3. Bibcode 2009Sci...323..610E. doi:10.1126/science.1167130. PMID 19179524.
- ^ Konstantin Novoselov. "Beyond the wonder material." Physics World August 2009, 27-30.
- ^ G. Savini et al. (2010). "Doped graphane: a prototype high-Tc electron-phonon superconductor". Phys Rev Lett 105. arXiv:1002.0653v1.
