表面修飾剤による酸化インジウム系素子のCO検知特性の改善 [in Japanese] Improvement of In_2O_3-Based CO Sensor by Using Surface Modifiers [in Japanese]
Access this Article
Search this Article
Aiming at developing a semiconductor CO sensor applicable to the safety control of gas appliances, we carried out an extensive material search for promoters to In<sub>2</sub>O<sub>3</sub>-based elements. Among the elements added (0.5 wt%) with each of 12 transition metal oxides, the Co<sub>3</sub>O<sub>4</sub>-added one was outstanding in sensitivity and selectivity to CO at 200°C. Remarkably the sensing properties of this element could be improved further by the addition of Au (0.04 wt%). The doubly promoted element, Au (0.04 wt%)-Co(0.5 wt%)-In<sub>2</sub>O<sub>3</sub>, gave excellent characteristics in sensitivity to CO, selectivity to CO over H2 and other selected gases, and response rates at 250°C. The promoting effects of the additives were shown to originate from the proper enhancement of catalytic activity for CO oxidation.
- The Journal of the Institute of Electrical Engineers of Japan
The Journal of the Institute of Electrical Engineers of Japan 118(2), 100-105, 1998-02
The Institute of Electrical Engineers of Japan