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. N. GOYANES; D. ZILLI; A. L. CUKIERMAN; R. CANDAL

JOURNAL OF PHYSICS: CONFERENCE SERIES

INSTITUTE OF PHYSICS

Año: 2009 vol. 167 p. 1 - 5

1742-6596

We have measured the speci c heat at constant pressure, Cp, of three di erent samples of multiwall carbon nanotubes (MWNT). For all samples, Cp departs from a graphitic behavior at T < 120 K. Cp measurements show a temperature threshold from a linear regime for intermediate  temperature to a higher-order power law for low temperatures. Moreover, it was found that this crossover only depends on the internal structure of the individual MWNT and not on the spatial order of the MWNT within a bundle.Cp, of three di erent samples of multiwall carbon nanotubes (MWNT). For all samples, Cp departs from a graphitic behavior at T < 120 K. Cp measurements show a temperature threshold from a linear regime for intermediate  temperature to a higher-order power law for low temperatures. Moreover, it was found that this crossover only depends on the internal structure of the individual MWNT and not on the spatial order of the MWNT within a bundle.