NOx Gas Sensing Properties of ZnO-based Varistor-type Gas Sensors (特集 環境ガスセンサ) NOx Gas Sensing Properties of ZnO-based Varistor-type Gas Sensors

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Current (<i>I</i>)-voltage (<i>V</i>) characteristics of ZnO-based oxides have been investigated in air as well as in 100 ppm NO<sub>2</sub> and NO balanced with air at elevated temperatures. A pure ZnO exhibited a nonlinear <i>I-V</i> characteristic in air and its breakdown voltage shifted to a high electric filed upon exposure to NO<sub>2</sub>, but to a low electric field upon exposure to NO. Grain size of ZnO was increased slightly by the Bi<sub>2</sub>O<sub>3</sub>-based additive, which is essential for fabricating conventional varistors used as voltage-surge suppressors. In accordance with this change the sensitivities to NO<sub>2</sub> and NO were decreased, especially at 300°C. The Bi<sub>2</sub>O<sub>3</sub>-based additive containing Y<sub>2</sub>O<sub>3</sub> was effective for reducing the grain size slightly, increasing the breakdown voltage in air and enhancing sensitivities, especially to NO<sub>2</sub> at 400°C and to NO at 300°C. The addition of Cr<sub>2</sub>O<sub>3</sub> to the Bi<sub>2</sub>O<sub>3</sub>-based additive containing Y<sub>2</sub>O<sub>3</sub> was more effective for reducing the grain size, but led to a deterioration of sensitivities to NO<sub>2</sub> and NO.

収録刊行物

  • 電気学会論文誌. E, センサ・マイクロマシン準部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A publication of Sensors and Micromachines Society  

    電気学会論文誌. E, センサ・マイクロマシン準部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A publication of Sensors and Micromachines Society 118(2), 130-135, 1998-02 

    The Institute of Electrical Engineers of Japan

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各種コード

  • NII論文ID(NAID)
    10004833198
  • NII書誌ID(NCID)
    AN1052634X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13418939
  • NDL 記事登録ID
    4392296
  • NDL 雑誌分類
    ZN31(科学技術--電気工学・電気機械工業)
  • NDL 請求記号
    Z16-B380
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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