Improved sensitivity of CuOBaTiO3 capacitive-type CO2 sensor by additives

Tatsumi Ishihara; Kazuhiro Kometani; Yuichiro Nishi; Yusaku Takita

doi:10.1016/0925-4005(94)01539-T

Improved sensitivity of CuOBaTiO₃ capacitive-type CO₂ sensor by additives

Tatsumi Ishihara, Kazuhiro Kometani, Yuichiro Nishi, Yusaku Takita

Research output: Contribution to journal › Article › peer-review

84 Citations (Scopus)

Abstract

The sensitivity of a CuOBaTiO₃ capacitive-type CO₂ sensor has been enhanced by the addition of metal or metal oxides except for Au, Fe₂O₃, CeO₂ and Rh, whereas the operating temperature shifts slightly to a higher temperature and the response time is prolonged. In particular, the change in capacitance caused by CO₂ is markedly enlarged by the addition of ZnO, Bi₂O₃, SrO and Ag. Among these additives, silver is the most suitable from the viewpoints of sensitivity and operating temperature. The CuOBaTiO₃ plus Ag sensor can detect CO₂ over four orders of magnitude of concentration from capacitance measurement. Furthermore, the positive effects of Ag addition on sensitivity are obtained only for CO₂ and CO. Therefore, CuOBaTiO₃ sensors exhibit extremely high selectivity to CO₂ detection in spite of the chemical stability of CO₂. The improved sensitivity due to Ag addition is reproducible and exhibits almost constant sensitivity to 5000 ppm CO₂ over a period of 30 days.

Original language	English
Pages (from-to)	49-54
Number of pages	6
Journal	Sensors and Actuators: B. Chemical
Volume	28
Issue number	1
DOIs	https://doi.org/10.1016/0925-4005(94)01539-T
Publication status	Published - Jul 1995
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1016/0925-4005(94)01539-T

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title = "Improved sensitivity of CuOBaTiO3 capacitive-type CO2 sensor by additives",

abstract = "The sensitivity of a CuOBaTiO3 capacitive-type CO2 sensor has been enhanced by the addition of metal or metal oxides except for Au, Fe2O3, CeO2 and Rh, whereas the operating temperature shifts slightly to a higher temperature and the response time is prolonged. In particular, the change in capacitance caused by CO2 is markedly enlarged by the addition of ZnO, Bi2O3, SrO and Ag. Among these additives, silver is the most suitable from the viewpoints of sensitivity and operating temperature. The CuOBaTiO3 plus Ag sensor can detect CO2 over four orders of magnitude of concentration from capacitance measurement. Furthermore, the positive effects of Ag addition on sensitivity are obtained only for CO2 and CO. Therefore, CuOBaTiO3 sensors exhibit extremely high selectivity to CO2 detection in spite of the chemical stability of CO2. The improved sensitivity due to Ag addition is reproducible and exhibits almost constant sensitivity to 5000 ppm CO2 over a period of 30 days.",

author = "Tatsumi Ishihara and Kazuhiro Kometani and Yuichiro Nishi and Yusaku Takita",

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AU - Ishihara, Tatsumi

AU - Kometani, Kazuhiro

AU - Nishi, Yuichiro

AU - Takita, Yusaku

PY - 1995/7

Y1 - 1995/7

N2 - The sensitivity of a CuOBaTiO3 capacitive-type CO2 sensor has been enhanced by the addition of metal or metal oxides except for Au, Fe2O3, CeO2 and Rh, whereas the operating temperature shifts slightly to a higher temperature and the response time is prolonged. In particular, the change in capacitance caused by CO2 is markedly enlarged by the addition of ZnO, Bi2O3, SrO and Ag. Among these additives, silver is the most suitable from the viewpoints of sensitivity and operating temperature. The CuOBaTiO3 plus Ag sensor can detect CO2 over four orders of magnitude of concentration from capacitance measurement. Furthermore, the positive effects of Ag addition on sensitivity are obtained only for CO2 and CO. Therefore, CuOBaTiO3 sensors exhibit extremely high selectivity to CO2 detection in spite of the chemical stability of CO2. The improved sensitivity due to Ag addition is reproducible and exhibits almost constant sensitivity to 5000 ppm CO2 over a period of 30 days.

AB - The sensitivity of a CuOBaTiO3 capacitive-type CO2 sensor has been enhanced by the addition of metal or metal oxides except for Au, Fe2O3, CeO2 and Rh, whereas the operating temperature shifts slightly to a higher temperature and the response time is prolonged. In particular, the change in capacitance caused by CO2 is markedly enlarged by the addition of ZnO, Bi2O3, SrO and Ag. Among these additives, silver is the most suitable from the viewpoints of sensitivity and operating temperature. The CuOBaTiO3 plus Ag sensor can detect CO2 over four orders of magnitude of concentration from capacitance measurement. Furthermore, the positive effects of Ag addition on sensitivity are obtained only for CO2 and CO. Therefore, CuOBaTiO3 sensors exhibit extremely high selectivity to CO2 detection in spite of the chemical stability of CO2. The improved sensitivity due to Ag addition is reproducible and exhibits almost constant sensitivity to 5000 ppm CO2 over a period of 30 days.

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Improved sensitivity of CuOBaTiO₃ capacitive-type CO₂ sensor by additives

Abstract

All Science Journal Classification (ASJC) codes

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