Identification of the constituents of double-walled carbon nanotubes using Raman spectra taken with different laser-excitation energies

Feng Li, S. G. Chou, Wencai Ren, J. A. Gardecki, A. K. Swan, M. S. Ünlü, B. B. Goldberg, Hui Ming Cheng*, M. S. Dresselhaus

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Double-walled carbon nanotubes (DWNTs), synthesized by the catalytic decomposition of methane, were explored by resonance Raman spectroscopy using different energies for laser excitation. Based on the radial breathing mode frequencies, the indices of the two layers of a DWNT were approximately assigned, depending on the interlayer separation of the two coaxial layers of the DWNT, which ranged from 0.34 to 0.40 nm. From the tentatively assigned results, it was found that the two walls of the DWNT are not strongly selected by chirality and diameter. The results, however, suggest that, for the tubes that are resonant with the available laser excitation energies, most of the outer layers of the observed DWNTs in our samples are semiconducting, while the inner layers of the observed DWNTs are either semiconducting or metallic based on the assembled DWNTs. The characteristics of the G, D, and G' band of the DWNTs are discussed, and a double peak feature in the D and G' band, originating from the inner and outer layers of the DWNTs, is reported.

Original languageEnglish (US)
Pages (from-to)1251-1258
Number of pages8
JournalJournal of Materials Research
Volume18
Issue number5
DOIs
StatePublished - May 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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