Study On Gas Sensing And Catalytic Properties Of Complex Metal Oxide For CH₄ And NO₂

Tin oxide is the most common material in semiconductor gas sensors due to its good chemical stability and lower operating temperature compared to the other oxides for detection of reducing and oxidizing gases. In order to enhance thermal stability and sensitivity towards specific gases, this paper aims at preparating SnO₂ based gas sensing nanocomposites with chemical homogeneous and superior thermal stability compared to single-component Tin oxide using mechanical mix and chemical controlled precipitation method. The performance and phase structure of the nanocomposites were characterized by XRD, TEM, BET and Zeta distribution etc.The effect of composition of nanocomposites, operating temperature, calcination temperature and target gas concentration in air on sensing performance of the nanocomposites were investigated. In this work, a new sensing material was made by a mixing of SnO₂, In₂O₃ and TiO₂ crystalline grain. The optimal composition is 20%InO_1.5-20%TiO₂-60%SnO₂. A small amount of noble metals or metal oxides as dopants and surface modifying introduced to the optimized nanocomposite, greatly improved the sensitivity at...