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Ivanovskaya, V. V., Zobelli, A., Wagner, P., Heggie, M. I., Briddon, P. R., Rayson, M. J. & Ewels, C. P. (2011) Low-Energy Termination of Graphene Edges via the Formation of Narrow Nanotubes. Phys. Rev. Lett. 107 065502.
Added by: Laurent Cournède (2016-03-10 21:32:20) |
| Type de référence: Article DOI: 10.1103/PhysRevLett.107.065502 Numéro d'identification (ISBN etc.): 0031-9007 Clé BibTeX: Ivanovskaya2011 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: atomic-resolution, dynamics, graphite, sheets, smallest carbon nanotube Créateurs: Briddon, Ewels, Heggie, Ivanovskaya, Rayson, Wagner, Zobelli Collection: Phys. Rev. Lett. |
Consultations : 1/444
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We demonstrate that free graphene sheet edges can curl back on themselves, reconstructing as nanotubes. This results in lower formation energies than any other nonfunctionalized edge structure reported to date in the literature. We determine the critical tube size and formation barrier and compare with density functional simulations of other edge terminations including a new reconstructed Klein edge. Simulated high resolution electron microscopy images show why such rolled edges may be difficult to detect. Rolled zigzag edges serve as metallic conduction channels, separated from the neighboring bulk graphene by a chain of insulating sp(3)-carbon atoms, and introduce van Hove singularities into the graphene density of states.
Added by: Laurent Cournède |