The effect of sorbed hydrogen on low temperature radial thermal expansion of single-walled carbon nanotube bundles
A.V. Dolbin, V.B. Esel'son, V.G. Gavrilko, V.G. Manzhelii, S.N. Popov, and N.A. Vinnikov
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
Department of Physics, Umea University, SE - 901 87 Umea, Sweden pos Анотація:
Received July 2, 2009
The effect of a normal H2 impurity upon the radial thermal expansion ar of single-walled carbon nanotube (SWNT) bundles has been investigated in the interval T = 2.2–27 K using the dilatometric method. It is found that H2 saturation of SWNT bundles causes a shift of the temperature interval of the negative thermal expansion towards lower (as compared to pure carbon nanotubes) temperatures and a sharp increase in the magnitude of ar in the whole range of temperatures investigated. The low temperature desorption of H2 from a powder consisting of bundles of SWNTs, open and closed at the ends, has been investigated.
PACS: 74.70.Wz Fullerenes and related materials.
Key words: single-walled carbon nanotubes, bundles of carbon nanotubes, radial thermal expansion, low temperature hydrogen desorption.