The effect of O2 impurities on the low temperature radial thermal expansion of bundles of closed single-walled carbon nanotubes

TL;DR

This study investigates how oxygen impurities influence the low-temperature radial thermal expansion of bundles of closed single-walled carbon nanotubes, revealing increased expansion and specific peaks upon oxygen saturation.

Contribution

It provides new insights into the impact of oxygen impurities on the thermal expansion behavior of single-walled carbon nanotube bundles at cryogenic temperatures.

Findings

Oxygen saturation increases positive thermal expansion values.

Multiple peaks in ar(T) appear above 20 K after oxygen saturation.

Oxygen desorption occurs at low temperatures from nanotube bundles.

Abstract

The effect of oxygen impurities upon the radial thermal expansion (ar) of bundles of closed single-walled carbon nanotubes has been investigated in the temperature interval 2.2-48 K by the dilatometric method. Saturation of bundles of nanotubes with oxygen caused an increase in the positive ar-values in the whole interval of temperatures used. Also, several peaks appeared in the temperature dependence ar(T) above 20 K. The low temperature desorption of oxygen from powders consisting of bundles of single-walled nanotubes with open and closed ends has been investigated