Electrostatic Doping-Induced Phonon Shift of Metallic Single-Wall Carbon Nanotubes

Confocal Raman microscopy is used to record the Raman spectra of a metallic single-wall carbon nanotube (SWNT) exposed to ambient air under electrostatic gating. Significant and irreversible changes in the carbon−carbon stretching modes (G band) Raman spectrum of the tube are observed. The gate depe...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2008-12, Vol.112 (51), p.20118-20122
Main Authors: Zhang, Li, Huang, Limin, O’Brien, Stephen P, Yu, Zhonghua
Format: Article
Language:English
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Summary:Confocal Raman microscopy is used to record the Raman spectra of a metallic single-wall carbon nanotube (SWNT) exposed to ambient air under electrostatic gating. Significant and irreversible changes in the carbon−carbon stretching modes (G band) Raman spectrum of the tube are observed. The gate dependent frequency shift and line broadening of the G band spectrum exhibit a much larger magnitude as well as a hysteresis behavior compared to the previous similar Raman scattering studies of individual nanotubes placed in vacuum. G band Raman spectra similar to those of typical semiconducting tubes are resolved when the metallic tube is highly doped, allowing for the observation of gradual evolution of the G band spectrum from a semiconducting type to the typical broad Fano type. Such observation reveals evidence of phonon interaction between the G band modes having same frequency. Raman spectroscopy is promising as a noninvasive tool to probe charge transfer doping in carbon nanotubes.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp809002c