B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: dolbin@ilt.kharkov.ua
B.A. Danilchenko, and N.A. Tripachko
Institute of Physics of the National Academy of Sciences of Ukraine, 46 Nauki Ave., Kyiv 03028, Ukraine pos Анотація:
Received January 17, 2011
Abstract
The influence of radioactive irradiation in the H2 atmosphere
upon the radial thermal expansion of singlewalled carbon nanotubes and their sorption of hydrogen has been investigated. The samples were irradiated (1.5·107 rad dose) with 1.2 MeV γ-quanta of 60Co in the normal H2 atmosphere under 1 atm at T = 300 K. The H2 sorption–desorption processes in the nanotube samples before and after irradiation were investigated at T = 15–1170 K. It is found that irradiation of CNTs in the H2 atmosphere increases considerably the quantity of H2 sorbed by the sample. The irradiation in the H2 atmosphere led to an increase in the magnitudes of the radial thermal expansion of CNT bundles in the whole
temperature interval (2–120 K). The effects of physically and chemically sorbed hydrogen in bundles of nanotubes upon the radial thermal expansion of the irradiated samples have been separated.
PACS: 65.80.–g Thermal properties of small particles, nanocrystals, nanotubes, and other related systems.
