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Radial breathing modes of single-walled carbon nanotubes in resonance Raman spectra at high temperature and their chiral index assignment |
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| Authors: | Takashi Uchida Masaya Tazawa Hiroshi Sakai Yoshihiro Kobayashi |
| Affiliation: | a NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan b CREST, Japan Science and Technology Agency, Chiyoda, Tokyo 102-0075, Japan c Department of Physics, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan d Department of Physics, Meiji University, Kawasaki, Kanagawa 214-8571, Japan |
| Abstract: | Radial breathing modes (RBMs) in resonance Raman spectra from single-walled carbon nanotubes (SWCNTs) on a SiO2/Si (0 0 1) substrate are studied between 25 and 720 °C. A change in the relative intensity of each RBM peak with temperature is observed, which originates from the temperature dependence of the resonance condition of nanotubes. For 25 °C, each RBM peak is reasonably assigned on the basis of data in the literature [J. Maultzsch, H. Telg, S. Reich, F. Hennrich, C. Thomsen, Phys. Rev. B 72 (2005) 205438]. By taking into account the temperature-dependent behavior of the relative intensity of the RBM peaks, each RBM peak is successfully assigned even for 720 °C. It is found that most of the observed RBM peaks for a laser excitation energy of Eexc = 1.96 eV are from chiral SWCNTs. These results make it possible to discuss further details of the chirality-dependent growth behavior observed for in situ Raman spectroscopy. |
| Keywords: | 61.46.Fg 78.30.Na |
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