A novel SnO2 nanostructures and their gas-sensing properties for CO

SnO2 semiconductor gas sensor as the most commonly sensors are used to check the main fault characteristic of dissolved gases in transformer oil. In current study, SnO2 rods and spheres were synthesized by the hydrothermal routes with tin salts under different conditions. We investigated the intermediate reaction on the formation of SnO2 with different morphologies and proposed their possible formation mechanisms. The structures and morphologies of this hierarchical architecture were characterized in detail by means of powder X-ray diffraction, field-emission scanning electron microscopy. Moreover, the obtained SnO2 rods are found to show the better sensing performances than the other structure with higher gas response during the response-recovery time, lower working temperature, and more sensitive response in the same concentration to carbon monoxide. Our results also illustrate that gas sensing properties of SnO2 can be significantly improved by varying the morphologies of the structures. The results may hold substantial promise in power system gas-sensing applications.