Ammonia gas sensor using thick film of Au-loaded tungsten trioxide

Masami Ando, Takashi Tsuchida, Seiichi Suto, Takahiro Suzuki, Chiaki Nakayama, Norio Miura, Noboru Yamazoe

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Thick films of Au-loaded WO3 mixed with glass frit were prepared on an alumina substrate by the printing method, and influences of film thickness, Au-loading and operating temperature on the NH3 sensing characteristics were investigated. With an increase in film thickness and Au-loading, the maximum sensitivity (Km) increased, while the temperature for maximum sensitivity (Tm) decreased. An optimum film was revealed to be the 4.0 mass % Au-loaded one of a 250 μm-thickness for the optimum operating temperature of 450°C. The sensor proved excellent NH3 sensing characteristics in gas sensitivity, response transient, resistance to humidity and long-term stability when subjected to heat cleaning once a day during its operation.

Original languageEnglish
Pages (from-to)1112-1116
Number of pages5
JournalJournal of the Ceramic Society of Japan
Issue number12
Publication statusPublished - 1996


  • Ammonia
  • Au
  • Gas sensor
  • Thick film
  • Tungsten trioxide

ASJC Scopus subject areas

  • Ceramics and Composites
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry


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