3.3.1 Ceria – Fundamentals and Applications in Different Fields of Gas Sensors
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- 3.3 Metal Oxide-based Gas Sensors III
- N. Izu - National Institute of Advanced Industrial Science and Technology (AIST) (Japan)
- 275 - 278
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 monoxide sensors which have fast response properties or are made from nanoparticles with very unique structures are explained. In the last part, odor sensors which can measure very low concentrations of H2S are also introduced.