NO<sub>x</sub> Gas Sensing Properties of ZnO-based Varistor-type Gas Sensors
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- Shimizu Yasuhiro
- Nagasaki University
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- Iwanaga Tomoko
- Nagasaki University
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- Takao Yuji
- Nagasaki University
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- Egashira Makoto
- Nagasaki University
Bibliographic Information
- Other Title
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- NOx Gas Sensing Properties of ZnO-based Varistor-type Gas Sensors
- NOx Gas Sensing Properties of ZnO-based
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Abstract
Current (I)-voltage (V) characteristics of ZnO-based oxides have been investigated in air as well as in 100 ppm NO2 and NO balanced with air at elevated temperatures. A pure ZnO exhibited a nonlinear I-V characteristic in air and its breakdown voltage shifted to a high electric filed upon exposure to NO2, but to a low electric field upon exposure to NO. Grain size of ZnO was increased slightly by the Bi2O3-based additive, which is essential for fabricating conventional varistors used as voltage-surge suppressors. In accordance with this change the sensitivities to NO2 and NO were decreased, especially at 300°C. The Bi2O3-based additive containing Y2O3 was effective for reducing the grain size slightly, increasing the breakdown voltage in air and enhancing sensitivities, especially to NO2 at 400°C and to NO at 300°C. The addition of Cr2O3 to the Bi2O3-based additive containing Y2O3 was more effective for reducing the grain size, but led to a deterioration of sensitivities to NO2 and NO.
Journal
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- IEEJ Transactions on Sensors and Micromachines
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IEEJ Transactions on Sensors and Micromachines 118 (2), 130-135, 1998
The Institute of Electrical Engineers of Japan
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Details
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- CRID
- 1390001204462714368
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- NII Article ID
- 10004833198
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- NII Book ID
- AN1052634X
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- ISSN
- 13475525
- 13418939
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- NDL BIB ID
- 4392296
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed