Oxygen adsorption on ZrO2-loaded SnO2 gas sensors in humid atmosphere

Koichi Suematsu, Hotaka Uchino, Takaharu Mizukami, Ken Watanabe, Kengo Shimanoe

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Oxygen adsorption on the surface of particles plays a key role in gas sensing for SnO2-based resistive-type gas sensors in a humid atmosphere. In this study, we added an extremely small amount of ZrO2 on the SnO2 surface to activate oxygen adsorption and enhance the sensor response of a SnO2-based gas sensor in a humid atmosphere. We evaluated the oxygen adsorption properties and sensor response to 200 ppm H2 in a humid atmosphere (96%) based on variations in the measured electrical resistance. The adsorption of O and O2− ions was activated by a small loading (0.033 mol%) of ZrO2, and the resulting ZrO2–SnO2 composite nanoparticles were in the deep electron-depleted state. This led to a high sensor response of ZrO2–SnO2 to H2 in a humid atmosphere. The results demonstrate that surface modification using an extremely small amount of ZrO2 was effective in improving the response of a SnO2-based gas sensor in a humid atmosphere.

Original languageEnglish
Pages (from-to)3135-3143
Number of pages9
JournalJournal of Materials Science
Issue number4
Publication statusPublished - Feb 1 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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