In situ cyclic voltammetry-surface-enhanced Raman spectroscopy: Studies on the doping-undoping of polypyrrole film

Yu Chuan Liu, Bing Joe Hwang, Wen Jie Jian, Raman Santhanam

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130 Citations (Scopus)


The redox behavior of polypyrrole (PPy) film in 0.2 M aqueous KNO3 solution was investigated by cyclic voltammetry (CV) in situ surface-enhanced Raman spectroscopy (SERS). The results show that the Raman intensity of C double bond C backbone stretching decreases and increases regularly with the anodic and cathodic scans, respectively, owing to the change of surface roughness and the possibility of state transition. The peak position of C-H in-plane deformation remains unchanged both in anodic and cathodic scans. Furthermore, the peak positions of N-H in-plane deformation and ring deformation shift to lower and higher wavenumbers with anodic and cathodic scans, respectively. Also the Raman peak of the NO3 - dopant ions appears significant when PPy is in a more oxidized state.

Original languageEnglish
Pages (from-to)85-91
Number of pages7
JournalThin Solid Films
Issue number1
Publication statusPublished - Oct 3 2000
Externally publishedYes


ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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