期刊
ACS NANO
卷 5, 期 12, 页码 9892-9897出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn203591j
关键词
single-walled carbon nanotubes; polyelectrolyte; redox potential; Raman spectroscopy; doping profile; dynamical screening
类别
资金
- Canadian NSERC Discovery
- Italian MIUR
- French ANR PNANO
We present a resonance Raman study of electrochemical charge transfer doping on polyelectrolyte single-walled carbon nanotubes (SWNTs) in solution. Changes in the intensity of the radial breathing modes of well-identified SWNTs are measured as a function of the electrochemical potential. The intensity is maximum when the nanotubes are neutral. Unexpectedly, the Raman signal decreases as soon as charges are transferred to the nanotubes, leading to intensity profiles that are triangular for metallic and trapezoidal for semiconducting nanotubes. A key result is that the width in energy of the plateaus for the semiconducting nanotubes is roughly equal to the optical gap (rather than the free carrier gap). While these experiments can be used to estimate the energy levels of individual nanotubes, strong dynamical screening appears to dominate In individual SWNT polyelectrolytes so that only screened energy levels are being probed.
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