Studies of thermal decay of electropolymerized polypyrrole using in situ surface-enhanced Raman spectroscopy

Yu Chuan Liu, Kuang Hsuan Yang, Li Huei Lin, Jeng Feng Tsai

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17 Citations (Scopus)


In this work, the thermal degradation of polypyrrole (PPy) films was investigated by using in situ surface-enhanced Raman spectroscopy (SERS) for the first time. The results indicate that the decay of PPy in conductivity can be ascribed to the loss in oxidation degree and to the shorter conjugation length of PPy upon heating samples from 25 to 75 °C. Continuously raising the temperature of the sample from 75 to 125 °C results in serious decay. The oxidation degree of PPy is significantly decreased correspondingly. However, the peak assigned to the C{double bond, long}C backbone stretching becomes broader due to the thermal decomposition of PPy. At temperatures of samples higher than 125 °C, PPy films lose their conducting properties and no characteristic peaks of oxidized PPy related to the oxidation degrees can be observed. Moreover, the peak of the C{double bond, long}C backbone stretching completely disappear due to the complete decomposition of PPy.

Original languageEnglish
Pages (from-to)161-164
Number of pages4
JournalElectrochemistry Communications
Issue number1
Publication statusPublished - Jan 2008
Externally publishedYes



  • Polypyrrole
  • Surface-enhanced Raman scattering
  • Thermal degradation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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