Quaternary and more complex metal oxide compounds for gas sensor design

Gas sensors have become increasingly desirable and necessary items in our daily lives due to their diverse applications in cutting-edge fields. Because of their high sensitivity, small size, and cheap cost, conductivity quaternary and more complex metal oxide with nanostructures gas sensors are among the most tempting for application areas in the automobile, medicinal, environmental, and safety sectors. Novel quaternary and more complex metal oxide with nanostructures have thus been suggested in recent years as sensing materials to enhance their sensing properties. The creation of heterostructures has been extensively used to improve the gas sensing capability of composite made of quaternary and more complex metal oxide with nanostructures. This chapter provides an overview of current developments in gas sensing behaviors for sensors built on nanostructured metal oxide heterostructures. In order to create oxide heterostructure in the sensing materials compared to pure metal oxide sensors, the sensors made with nanostructured heterojunction were shown to have improved gas sensing performance with quicker response times to the target reducing or oxidizing gases.