Role of covalent defects on phonon softening in metallic carbon nanotubes

Khoi T. Nguyen, Moonsub Shim

Research output: Contribution to journalArticlepeer-review


We have examined how electrical characteristics and charging dependent Raman G-band phonon softening In Individual metallic carbon nanotubes are Influenced by covalent defects. In addition to decreasing electrical conductance with increasing on/off current ratio eventually leading to semiconducting behavior, adding covalent defects reduces the degree of softening and broadening of longitudinal optical (LO) phonon mode of the G-band near the charge neutrality point where the bands cross. On the other hand, the transverse optical (TO) mode softening Is enhanced by defects. Implications on the Interpretation of Raman G-band phonon softening and on utilizing Raman spectroscopy to examine covalent functlonallzatlon are discussed.

Original languageEnglish (US)
Pages (from-to)7103-7106
Number of pages4
JournalJournal of the American Chemical Society
Issue number20
StatePublished - May 27 2009

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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