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

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2881-2885
Number of pages5
JournalJournal of the Electrochemical Society
Volume139
Issue number10
DOIs
Publication statusPublished - Jan 1 1992
Externally publishedYes

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mixed oxides
Carbon Dioxide
Oxides
carbon dioxide
Carbon dioxide
capacitors
Capacitors
Capacitance
oxides
capacitance
sensors
Sensors
Equivalent circuits
Resistors
sensitivity
impedance measurement
equivalent circuits
resistors
Electrodes
Air

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

Application of a Mixed Oxide Capacitor to the Selective Carbon Dioxide Sensor II. CO2 Sensing Characteristics of a Cuo-Based Oxide Capacitor. / ishihara, Tatsumi; Kometani, Kazuhiro; Mizuhara, Yukako; Takita, Yusaku.

In: Journal of the Electrochemical Society, Vol. 139, No. 10, 01.01.1992, p. 2881-2885.

Research output: Contribution to journalArticle

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abstract = "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.",
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