Role of covalent defects on phonon softening in metallic carbon nanotubes

Khoi T. Nguyen; Moonsub Shim

doi:10.1021/ja900461m

Role of covalent defects on phonon softening in metallic carbon nanotubes

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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)
Pages (from-to)	7103-7106
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	131
Issue number	20
DOIs	https://doi.org/10.1021/ja900461m
State	Published - May 27 2009

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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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.",

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AB - 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.

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Role of covalent defects on phonon softening in metallic carbon nanotubes

Abstract

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