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- Title
Characteristics of the Raman spectra of single-walled carbon nanotube bundles under electrochemical potential control.
- Authors
Takeda, Norihiko; Murakoshi, Kei
- Abstract
Resonant Raman scattering spectra of single-walled carbon nanotube–sodium dodecyl sulfate (SWNT–SDS) bundles adsorbed on Au electrodes have been investigated in aqueous electrolytes. Raman intensities of the radial breathing mode (RBM) with 785-nm laser excitation were monitored at different electrode potentials between −0.5 and +0.8 V relative to the SCE. Six resolved RBM peaks assignable to different diameter tubes all decreased in intensity when the electrode was positively biased, because of depletion of valence-band electrons associated with resonant excitation. The attenuation occurred at more positive potentials for narrower-diameter tubes with higher RBM frequencies consistent with their larger bandgaps. The results suggest the Fermi level is equilibrated in bundled SWNTs in contrast with the large Fermi-level shifts reported for isolated SWNTs.
- Subjects
RAMAN effect; LIGHT scattering; SPECTRUM analysis; CARBON nanotubes; NANOTUBES; ELECTRODES
- Publication
Analytical & Bioanalytical Chemistry, 2007, Vol 388, Issue 1, p103
- ISSN
1618-2642
- Publication type
Article
- DOI
10.1007/s00216-006-1032-y