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

doi:10.1016/S0040-6090(00)01061-0

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

Research output: Contribution to journal › Article

131 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	85-91
Number of pages	7
Journal	Thin Solid Films
Volume	374
Issue number	1
DOIs	https://doi.org/10.1016/S0040-6090(00)01061-0
Publication status	Published - Oct 3 2000
Externally published	Yes

ASJC Scopus subject areas

Surfaces, Coatings and Films
Condensed Matter Physics
Surfaces and Interfaces

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Liu, Y. C., Hwang, B. J., Jian, W. J., & Santhanam, R. (2000). In situ cyclic voltammetry-surface-enhanced Raman spectroscopy: Studies on the doping-undoping of polypyrrole film. Thin Solid Films, 374(1), 85-91. https://doi.org/10.1016/S0040-6090(00)01061-0

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abstract = "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.",

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