Radial breathing modes of single-walled carbon nanotubes in resonance Raman spectra at high temperature and their chiral index assignment
✍ Scribed by Takashi Uchida; Masaya Tazawa; Hiroshi Sakai; Akira Yamazaki; Yoshihiro Kobayashi
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 605 KB
- Volume
- 254
- Category
- Article
- ISSN
- 0169-4332
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✦ Synopsis
Radial breathing modes (RBMs) in resonance Raman spectra from single-walled carbon nanotubes (SWCNTs) on a SiO 2 /Si (0 0 1) substrate are studied between 25 and 720 8C. 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 8C, 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 temperaturedependent behavior of the relative intensity of the RBM peaks, each RBM peak is successfully assigned even for 720 8C. It is found that most of the observed RBM peaks for a laser excitation energy of E exc = 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.