Dislocations in carbon nanotube walls

Suarez-Martinez, Irene, Savini, Gianluca, Zobelli, Alberto and Heggie, Malcolm (2007) Dislocations in carbon nanotube walls. Journal of Nanoscience and Nanotechnology, 7 (10). pp. 3417-3420. ISSN 15334880

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We present a novel interpretation of defected tubes based on a dislocation model. A scroll (a sheet rolled without closure) is considered as an axial edge dislocation in a multiwall nanotube (MWNT). Screw dislocation type defects separate scroll from nested-tubes within the same nanotube. The glide of the screw dislocation causes the transformation between these two forms. In some cases, the mechanism of formation of an MWNT could, therefore, start with the formation of a scroll which, by gliding of a screw dislocation, is transformed into the more stable MWNT. We compare the structure and energetics of prismatic screw and edge dislocations in graphite and carbon nanotubes. We present calculations for the Peierls barrier of the first kind for graphite and we discuss this result for glide motion of screw dislocations in nanotubes. There is no evidence for stable spa atoms in any of the studied nanostructures. Copyright

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Irene Suarez Martinez
Date Deposited: 06 Feb 2012 20:39
Last Modified: 28 Mar 2012 09:00
URI: http://sro.sussex.ac.uk/id/eprint/27212
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