Optical properties of fullerene and non-fullerene peapods |
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| Authors: | H Kataura Y Maniwa M Abe A Fujiwara T Kodama K Kikuchi H Imahori Y Misaki S Suzuki Y Achiba |
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| Institution: | (1) Department of Physics, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan, JP;(2) Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, JP;(3) Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan, JP;(4) Department of Material and Life Science, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan, JP;(5) Department of Applied Chemistry, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan, JP |
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| Abstract: | Single-wall carbon nanotubes (SWNTs) encapsulating fullerenes, so-called fullerene peapods, were synthesized in high yield
by using diameter-selected nanotubes as pods. Transmission electron microscopy revealed high-density fullerene chains inside
the nanotubes. X-ray-diffraction measurements indicate 85% filling for C60 and 72% filling for C70 molecules as a total yield. Interestingly, C60 peas do not show any thermal expansion while C70 peas show normal behavior. Room-temperature Raman spectra show one-dimensional photopolymerization of C60 inside nanotubes by blue-laser irradiation, suggesting molecular rotation inside them. In C70 peapods, no photopolymerization was observed but the relative Raman intensity of each peak is different from the C70 3D crystal. This is probably caused by mixing of two different crystal structures in C70 peas. Furthermore, we synthesized Zn-diphenylporphyrin peapods. Optical absorption and Raman spectra suggest that the encapsulated
molecules are deformed by interaction with the SWNT.
Received: 12 November 2001 / Accepted: 3 December 2001 / Published online: 4 March 2002 |
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| Keywords: | PACS: 73 22 -f 87 64 Bx 87 64 Je |
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