Dependence of Raman spectra G′ band intensity on metallicity of single-wall carbon nanotubes

Ki Kang Kim, Jin Sung Park, Sung Jin Kim, Hong Zhang Geng, Kay Hyeok An, Cheol Min Yang, Kentaro Sato, Riichiro Saito, Young Hee Lee

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

We report the peculiar behavior of the G′ band Raman intensity, which is dependent on the metallicity of single-wall carbon nanotubes (SWCNTs). In the metallic SWCNTs, the G′ band intensity was enhanced relative to the G band intensity, while the G′ band intensity was suppressed in the semiconducting SWCNTs. Resonance Raman spectroscopy (using laser energies of Elaser =2.41, 1.96, 1.58, and 1.165 eV) showed these features on the metal-enriched and semiconducting-enriched SWCNT samples that had been selectively separated by the nitronium ions. The metallicity dependence was explained theoretically by calculating the resonance Raman intensity within the extended tight-binding calculations. The calculated results confirm that the G′ band intensity of the metallic SWCNTs is stronger than that for the semiconducting SWCNTs because the electron-phonon matrix elements for the TO phonon at the K point is larger for metallic SWCNTs and the resonance window for E33S is larger than that for E11M.

Original languageEnglish
Article number205426
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number20
DOIs
Publication statusPublished - 2007 Nov 20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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