Catalytic and Gas Sensing Characteristics in Pd‐Doped SnO2

A tin oxide based ceramic doped with , , and is developed to detect the gas. The sensitivity of gas sensing is measured with respect to the relative resistance change in the ceramic matrix upon the introduction of the gas. Intermediate operating temperature is required for the gas sensing and high sensitivity is observed at 300°C. Metallic Pd is present in the sensing matrix after mixing in ethyl, while shows up after sintering at 800°C. The presence of enhances the gas sensitivity and the response rate. However, tends to be transformed to Pd in the sensing process, which leads to the deterioration in the sensitivity. A post‐oxidation treatment at 600°C proves to be effective in retaining and high sensitivity without degradation can be obtained. In addition, a model in the gas sensing process is proposed.