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Nitrogen physisorption and site blocking on single-walled carbon nanotubes
Authors:S-K Lee  S Iwata  S Ogura  Y Sato  K Tohji  K Fukutani
Institution:1. Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan;2. Environmental Studies, Tohoku University, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
Abstract:N2 physisorption on Single-Walled Carbon Nanotubes (SWCNTs) was investigated by cryogenic thermal-desorption spectroscopy (cryo-TDS). TDS spectra revealed a desorption peak at 48 K (α) for as-purified SWCNTs and an additional desorption peak at 73 K (β) for air-oxidized SWCNTs. When N2 and H2 were coadsorbed on SWCNTs, H2 adsorption was blocked by the N2 preadsorption. By comparing the TDS data with and without the N2 preadsorption, the α and β peaks were attributed to N2 adsorbed on the groove site and inside of SWCNTs, respectively.
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