A novel ion sensor without a reference electrode

Keiji Tsukada, Fumiyuki Kobayashi, Toyotaka Inoue, Toshihiko Kiwa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We developed an ion sensor with a novel structure that does not require a reference electrode. The structure consists of a double electrode comprising an outer electrode with a hole and an inner electrode, a polymeric ion-selective membrane, and the sensor body. The ion sensitivity of a potassium ion sensor, where the hole of the outer electrode was the same size as the inner electrode, was 55 mV/decade. The sensor exhibited increased sensitivity according to the increment of the hole size. The sensitivity was also dependent on the thickness of the outer membrane covering the outer electrode. These phenomena were examined using a membrane potential gradient simulation.

Original languageEnglish
Pages (from-to)1163-1166
Number of pages4
JournalSensor Letters
Issue number6
Publication statusPublished - Dec 2009


  • All-solid-state sensor
  • Ion sensor
  • Reference electrode
  • Sensor structure

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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