Application of electroinactive polypyrrole film to the pH sensor electrode

Tetsuya Osaka*, Toshihiro Fukuda, Himeko Kanagawa, Toshiyuki Momma, Shigeru Yamauchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


On the basis of a metal/insulator/metal (MIM) device using electroinactive polypyrrole (PPy) film as an insulator, an amperometric pH sensor device for a very small test solution (4 μl) was developed using the structure of Au/PPy/Au with a window hole. Electropolymerized thin PPy film formed from alkaline solution is used for the ion-selective membrane. The Au/PPy/Au device with a d.c. voltage supply from 0 to 0.2 V works well as an amperometric pH sensor, that is, the gradient of the Cottrell plot within 10 s corresponds exactly to the pH value.

Original languageEnglish
Pages (from-to)205-208
Number of pages4
JournalSensors and Actuators: B. Chemical
Issue number1-3
Publication statusPublished - 1993 May

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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