3.3.1 Ceria – Fundamentals and Applications in Different Fields of Gas Sensors

Noriya Izu
Ceria, cerium oxide, is attractive to many applications. This paper focuses on gas sensors using ceria. Ceria can change its oxidation state from Ce3+ to Ce4+ and vice versa, and the resistance of ceria changes with the oxidation state of cerium ion at temperatures higher than 300oC. In this paper, three kinds of resistive type sensors using ceria are introduced. First, oxygen sensors with fast response properties or temperature independent signal are described. Next, carbon...