Effects of phonon dimensionality in the specific heat of multiwall carbon nanotubes at low temperatures

G. A. JORGE; V. BEKERIS; C. ACHA; M. M. ESCOBAR; S. GOYANES; D. ZILLI; A. L. CUKIERMAN; R. J. CANDAL

Journal of Physics Conference Series

IOP

Año: 2009 vol. 167 p. 12008 - 12008

1742-6596

We have measured the specific heat at constant pressure, Cp, of three diferent samples ofmultiwall carbon nanotubes (MWNT). For all samples, Cp departs from a graphitic behavior atT < 120 K. Cp measurements show a temperature threshold from a linear regime for intermediatetemperature to a higher-order power law for low temperatures. Moreover, it was found thatthis crossover only depends on the internal structure of the individual MWNT and not on thespatial order of the MWNT within a bundle.