Abstract
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 language | English (US) |
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Pages (from-to) | 7103-7106 |
Number of pages | 4 |
Journal | Journal of the American Chemical Society |
Volume | 131 |
Issue number | 20 |
DOIs | |
State | Published - May 27 2009 |
ASJC Scopus subject areas
- Catalysis
- General Chemistry
- Biochemistry
- Colloid and Surface Chemistry