静電容量変化に基づいた高温作動型NOxセンサ [in Japanese] CAPACITIVE TYPE NOx SENSOR OPERABLE AT HIGH TEMPERATURE [in Japanese]
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Capacitive type NO sensor which is operable at high temperature was investigated in this study for monitoring NO in flue gases from gasoline engine vehicle. Although the high sensitivity is obtained at temperature lower than 400°C, it is negligibly small at temperature higher than 500°C on large part of the mixed oxide examined. On the other hand, BaSnO<sub>3</sub> or SrSnO<sub>3</sub> mixed with WO<sub>3</sub> exhibits the high sensitivity at temperature higher than 500°C. In particular, mixed oxide capacitor of SrSnO<sub>3</sub>-WO<sub>3</sub> exhibited the high sensitivity to NO at 550°C. Since the capacitance of this oxide increased with increasing NO concentration, in the range from 10 to few 1000ppm. NO concentration can be evaluated with the capacitance of the element. Furthermore, the capacitance of SrSnO<sub>3</sub>-WO<sub>3</sub> is less sensitive to CO<sub>2</sub>, H<sub>2</sub>O and CO comparing that to NO. Consequently, mixed oxide of SrSnO<sub>3</sub>-WO<sub>3</sub> is promising for the capacitive NO sensor operable at high temperature.
- The Journal of the Institute of Electrical Engineers of Japan
The Journal of the Institute of Electrical Engineers of Japan 118(2), 113-118, 1998-02
The Institute of Electrical Engineers of Japan