Tight binding method simulation of the formation of nanotube

The formation of nanotube has been studied by tight binding molecular dynam ics (TBMD) simulation technique. We found, in agreement with previous exper imental and theoretical work, two layers of graphite flake can be curled up to form different nanotubes, whose helicity depend on the initial structur e of graphite flake. Temperature is one of the critical factors responsible for the formation and closure of nanotube. (C) 2001 Published by Elsevier Science B.V.