Electrolyte-Solution-Gate FETs Using Diamond Surface for Biocompatible Ion Sensors

H. Kawarada*, Y. Araki, T. Sakai, T. Ogawa, H. Umezawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

134 Citations (Scopus)


Diamond field effect transistors have operated in electrolyte solution for the first time. Since the hydrogen-terminated diamond surfaces are stable enough for the use as an electrochemical electrode, the diamond surface channels are exposed to the electrolyte in the transistor structure. A perfect pinch-off and saturated current-voltage characteristics have been obtained for bias voltages within the potential window. The threshold voltages are almost constant in electrolytes with different pH values of 7-13, indicating pH insensitiveness of the hydrogen-terminated diamond surface. Based on this pH insensitive surface, ion selective regions can be fabricated to form transistor-based biosensors.

Original languageEnglish
Pages (from-to)79-83
Number of pages5
JournalPhysica Status Solidi (A) Applied Research
Issue number1
Publication statusPublished - 2001 May

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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