Formation of PPy/Ta2O5/Ta structure by electropolymerization

Young‐Seo ‐S Park, Shinji Takeoka, Kimihisa Yamamoto, Eishun Tsuchida*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Electropolymerization of pyrrole on tantalum (Ta) electrodes was carried out in buffer solutions (0.04 M phosphoric acid, 0.04 M acetic acid, 0.04 M boric acid and 0.2 M sodium hydroxide) containing 0.1 M sodium ptoluenesulfonate (TsONa) under galvanostatic conditions and it was found that a polypyrrole (PPy) and a tantalum oxide (Ta2O5) layer are formed on a Ta electrode by an electrochemical oxidation process. The conditions of this simultaneous formation were studied in respect to current density (id), pyrrole concentration ([Py]), pH and the amount of electricity. Under certain conditions ([Py] = 0.25 M, pH = 1.8, id = 10–20 mA cm−2, the amount of electricity = 1 C), 6–8 μm thick PPy films were efficiently formed on homogeneous 30–50 nm thick Ta2O5 layers. The PPy film showed a high electrical conductivity (110 s cm−1), adhered well and covered the Ta2O5 layer. The resulting PPy/Ta2O5/Ta system is therefore proved to have excellent properties as a capacitor.

Original languageEnglish
Pages (from-to)395-400
Number of pages6
JournalPolymers for Advanced Technologies
Issue number7
Publication statusPublished - 1992 Nov


  • Capacitor
  • Electropolymerization
  • Polypyrrole
  • Tantalum oxide
  • p‐Toluenesulfonate

ASJC Scopus subject areas

  • Polymers and Plastics


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