HEAT-CAPACITY OF CARBON NANOTUBES

The low-temperature behavior of the heat capacity, C-v, of carbon nano tubes is estimated in order to address the question: How small must na notubes be for C-v to be measurably different from that of bulk graphi te? We predict that all single-walled tubes should have C-v proportion al to T at sufficiently low temperature, even if the tubes are semicon ducting. The range of temperature and tube radii for which this is exp ected to be observable is shown to be well within current experimental constraints. Multi-walled tubes are also discussed. Published by Else vier Science Ltd