The specific heat and the radial thermal expansion of bundles of single-walled carbon nanotubes

TL;DR

This study investigates the specific heat and radial thermal expansion of bundles of single-walled carbon nanotubes from 2 to 120 K, revealing characteristic features and their correlation with thermal properties.

Contribution

It provides new experimental data on heat capacity and thermal expansion of SWNT bundles, highlighting their temperature-dependent behavior and Gruneisen coefficient features.

Findings

Heat capacity shows features near 5, 36, 80, and 100 K.

Heat capacity and thermal expansion coefficient exhibit similar behavior above 10 K.

Gruneisen coefficient has a notable feature near 36 K and becomes negative below 6 K.

Abstract

The specific heat at constant pressure of bundles of single-walled carbon nanotubes closed at their ends has been investigated in a temperature interval of 2-120 K. It is found that the curve of heat capacity has features near 5, 36, 80, and 100 K. The experimental results on the heat capacity and the radial thermal expansion coefficient of bundles of SWNTs oriented perpendicular to the sample axis have been compared. It is found that the curves of the heat capacity and the radial thermal expansion coefficient exhibit a similar temperature behavior above 10 K. The temperature dependence of the Gruneisen coefficient has been calculated. The curve of the Gruneisen coefficient also has a feature near 36 K. Above 36 K the Gruneisen coefficient is practically independent of temperature. Below 36 K the Gruneisen coefficient decreases monotonically with lowering temperature and becomes negative below 6 K.