Anomaly of CH4 molecular assembly confined in single-wall carbon nanohorn spaces |
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| Authors: | Hashimoto Sachie Fujimori Toshihiko Tanaka Hideki Urita Koki Ohba Tomonori Kanoh Hirofumi Itoh Tsutomu Asai Michihiro Sakamoto Hirotoshi Niimura Subaru Endo Morinobu Rodriguez-Reinoso Francisco Kaneko Katsumi |
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| Affiliation: | Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. |
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| Abstract: | Vibrational-rotational properties of CH(4) adsorbed on the nanopores of single-wall carbon nanohorns (SWCNHs) at 105-140 K were investigated using IR spectroscopy. The difference vibrational-rotational bands of the ν(3) and ν(4) modes below 130 K show suppression of the P and R branches, while the Q branches remain. The widths of the Q branches are much narrower than in the bulk gas phase due to suppression of the Doppler effect. These results indicate that the rotation of CH(4) confined in the nanospaces of SWCNHs is highly restricted, resulting in a rigid assembly structure, which is an anomaly in contrast to that in the bulk liquid phase. |
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