Hydrogen selectivity of a proton-pumping gate FET hydrogen sensor in an AC modulation mode

Tomiharu Yamaguchi, Masanori Takisawa, Toshihiko Kiwa, Hironobu Yamada, Keiji Tsukada

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The response characteristics of a proton pumping gate FET (PPG-FET) with a triple layer gate structure (Pd/proton conducting polymer/Pt) to various gases were investigated. Two kinds of hydrogen response signals (DC and AC) were obtained from the PPG-FET when the AC bias voltage was applied between the gate electrodes of the PPG-FET. The DC signals showed high hydrogen sensitivities and the sensitivities were about -30 mV/decade. Additionally, the AC signal decreased by 10 mV with increase in the hydrogen concentration from 100 ppm to 10%. Whereas the DC signals decreased slightly with increasing oxygen concentration, the oxygen response was much smaller than the DC hydrogen sensitivities. In contrast, the AC signal hardly responded to oxygen. This is because a proton conducting polymer layer prevents the movement of oxygen ions. Additionally, the proton pumping gate FET showed good selectivity against other gases (methane, ethane, ammonia, and methanol). These results clarify the high hydrogen sensitivity of the PPG-FET in an AC modulation mode.

Original languageEnglish
Pages (from-to)110-114
Number of pages5
JournalIEEJ Transactions on Sensors and Micromachines
Issue number4
Publication statusPublished - 2009


  • Field effect transistor
  • Hydrogen gas sensor
  • Hydrogen selectivity
  • Proton pumping gate

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering


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