Abstract
We propose a dislocation mechanism explaining the formation of multi-and single-sheet nanotubes and a disclination mechanism accounting for the formation of nanocones. According to the proposed mechanism, rolling up a graphite sheet gives rise to elastic stresses which are released through the slippage of dislocations with edge and screw components. Each closure of the sheet proceeds by a zipper mechanism and results in the formation of a single-sheet nanotube. The number of dislocation slippages is equal to the number of layers in a multisheet nanotube.
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