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Abstract: (Chemical Abstract 2008, : )
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Geometrical patterns on armchair nanotubes and their dependence on length (up to 10 nm)
have been studied using first-principles methods. The results indicate that finite nanotubes
do not show a uniform bond structure. The previous structural classification of armchair nanotubes in
Clar, Kekule´, and incomplete-Clar types becomes unified with lengthening, not in a bond-uniform structure,
as PBC models report, but into an alternated sequence of Clar and Kekule´ domains in all cases,
with possible mechanical and electronic consequences.
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