Steplike dispersion of the intermediate-frequency Raman modes in semiconducting and metallic carbon nanotubes

C. Fantini, A. Jorio, M. Souza, R. Saito, Ge G. Samsonidze, M. S. Dresselhaus, M. A. Pimenta

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48 Citations (Scopus)

Abstract

Resonance Raman spectra of semiconducting and metallic single-wall carbon nanotube bundles have been investigated in the spectral range between 600 and 1100 cm-1, which is associated with intermediate frequency modes. A large range of nanotube diameters corresponding to HiPco and electric-arc samples (0.7-1.8 nm), and laser excitation energies between 1.62 and 2.71 eV have been used in the measurements. A rich set of peaks is observed, some of them independent of the excitation laser energy and some exhibiting a steplike dispersive behavior. The nondispersive peaks are assigned. The model proposed by Fantini [Phys. Rev. Lett. 93, 087401 (2004)] to explain the steplike dispersive behavior of the intermediate frequency modes is then extended to different SWNT diameters and different Eii transitions, including semiconducting and metallic SWNTs.

Original languageEnglish
Article number085446
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number8
DOIs
Publication statusPublished - 2005 Aug 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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