Carbon nanotubes

Carbon nanotubes (CNT) and boron nitride nanotubes (BNNT) have attracted much attention as candidates for a hydrogen storage media 5, 9. During the past decade, the carbon-based materials have been considered as promising media for hydrogen storage 10, 11. However, due to the very weak physical adsorption of H2 for most materials including carbon-based materials, attention has been directed at non-carbon nanosystems composed of light elements such as B and N 9. Boron nitride nanotubes (BNNTs) are inorganic analogs of carbon nanotubes (CNTs) 12 and theoretically predicted 13 and then successfully synthesized in 1995 14. BNNTs have attracted considerable attention due to the undisputed fact that in contrast to metallic or semiconducting CNTs: BNNTs are wide-gap semiconductors with almost same band gaps of 5.5 eV, independent of the tube diameter, helicity, and the number of tube walls 15, and they are chemically and thermally more stable 13,16–18.