Ionics

, Volume 14, Issue 1, pp 15–25

Zirconia-based planar NO2 sensor using ultrathin NiO or laminated NiO–Au sensing electrode

Authors

  • Vladimir V. Plashnitsa
    • Art, Science and Technology Center for Cooperative ResearchKyushu University
  • Taro Ueda
    • Interdisciplinary Graduate School of Engineering SciencesKyushu University
  • Perumal Elumalai
    • Art, Science and Technology Center for Cooperative ResearchKyushu University
  • Toshikazu Kawaguchi
    • Art, Science and Technology Center for Cooperative ResearchKyushu University
    • Art, Science and Technology Center for Cooperative ResearchKyushu University
Original Paper

DOI: 10.1007/s11581-007-0158-z

Cite this article as:
Plashnitsa, V.V., Ueda, T., Elumalai, P. et al. Ionics (2008) 14: 15. doi:10.1007/s11581-007-0158-z

Abstract

The nanostructured thin NiO films with the thicknesses of 30–180 nm were examined as a sensing electrode (SE) for the planar mixed-potential-type yttria-stabilized zirconia (YSZ)-based NO2 sensor. The sensing characteristics were examined in the temperature range of 600–800 °C under the wet condition (5 vol.% water vapor). Among the NiO-SEs tested, the 60 nm-thick NiO-SE sintered at 1,000 °C was found to give the highest NO2 sensitivity in the NO2 concentration range of 50–400 ppm accompanying with fast response/recovery at the operating temperatures of 600–700 °C. The high NO2 sensitivity was attributed to the high catalytic activity for both electrochemical reactions of O2 and NO2 at the interface of NiO-SE/YSZ. The ultrathin gold layer with the thickness of about 60 nm was additionally formed on the 60 nm-thick NiO-SE to fabricate the laminated-type (60 nm NiO/60 nm Au)-SE. It was demonstrated that the use of this laminated (NiO–Au)-SE improved both the sensitivity and the selectivity to NO2.

Keywords

NOx sensorMixed potentialStabilized zirconiaNiOAuThin film

Copyright information

© Springer-Verlag 2007