The first all-electron ab initio study of Young's modulus and Poisson ratio
for a number of closed single-walled nanotubes is presented. At the Hartre
e-Fock 6-31G* level, the results obtained compare well with experimental as
well as previous theoretical studies, predicting a Young's modulus higher
than 1 TPa. The calculated Young's modulus for a graphene layer is found to
be smaller than for its (5,5)-nanotube counterpart. (C) 2000 Published by
Elsevier Science B.V.