Application of a Mixed Oxide Capacitor to the Selective Carbon Dioxide Sensor II. CO2 Sensing Characteristics of a Cuo-Based Oxide Capacitor

Tatsumi ishihara, Kazuhiro Kometani, Yukako Mizuhara, Yusaku Takita

研究成果: ジャーナルへの寄稿学術誌査読

33 被引用数 (Scopus)

抄録

Characteristics for CO2 sensing of a CuO-based oxide capacitor were studied. The capacitances of CuO mixed with BaSnO3 SrTiO3, CaTiO3, and ZnO are dependent on the CO2 concentration, similar to CuO-BaTiO2. In particular, the mixed oxide, CuO-SrTiO3, is more sensitive to CO2 than CuO-BaTiO3, but requires a rather long time to recover. On the other hand, the mixed oxide capacitor, CuO-BaSnO3, exhibits high CO2 sensitivity, and a monotonic and approximately logarithmic relationship exists between the sensitivity and the concentration of CO2 from 100 ppm to 50%. Furthermore, the capacitance of CuO-BaSnO3 increased rapidly within 30s after exposure to 2% CO2, and returned rapidly to the original level after reexposure to air. Therefore, the system, CuO-BaSnO3 is promising for sensing CO2 over a wide range of concentrations. From a complex impedance measurement, the equivalent circuit of the sensor element can be expressed by a series connection of three parallel resistors and capacitors which correspond to the intragrain region, grain interface between CuO and BaSnO3, and electrode interface. Since exposure of the element to 2% CO2 varied the capacitance of the grain interface, the grain interface between CuO and BaSnOa has an important role for CO2 detection.

本文言語英語
ページ(範囲)2881-2885
ページ数5
ジャーナルJournal of the Electrochemical Society
139
10
DOI
出版ステータス出版済み - 10月 1992
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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