Pt catalytic effects on a resistive oxygen sensor using Ce 0.9Zr0.1O2 thick film in rich conditions

Noriya Izu, Woosuck Shin, Ichiro Matsubara, Toshio Itoh, Maiko Nishibori, Norimitsu Murayama

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Abstract

In this study, we investigated the Pt catalyst effects on two structures through loading a Pt catalyst onto a resistive oxygen sensor using Ce 0.9Zr0.1O2 thick film. We used (1) Ce 0.9Zr0.1O2 thick film with a Pt/alumina layer, and (2) Pt/Ce0.9Zr0.1O2 thick film, in which Pt catalysts were prepared by heating platinum chloride. In the case of sensor structure (1), it became clear that the Pt/alumina layer with a Pt concentration of 40 wt% was the most effective in the Pt/alumina layers fabricated in this study, where R(λ = 0.6)/R(λ = 1.4) was 0.0099, and R(λ = 0.6)/R(λ = 1.4) of the 40 wt% Pt/alumina layer decreased with decreasing temperature. In the case of sensor structure (2), the minimum values of R(λ = 0.6)/R(λ = 1.4) at 600 and 700°C were the same at 0.035. The ultrasonic treatment in the Pt loading process improved R(λ = 0.6)/R(λ = 1.4) to 0.02. The Pt particle size in this study was in a range from 20 to 100 nm because of the high temperature annealing in the Pt loading process.

Original languageEnglish
Pages (from-to)175-179
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume118
Issue number1375
DOIs
Publication statusPublished - Jan 1 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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