Microstructure and Gas-Sensing Property of Titania-Added ZnSnO₃

抄録

We report the microstructure and gas-sensing property of TiO₂-loaded ZnSnO₃ prepared by three different addition methods. We find that the loading of TiO₂ enables a significant improvement of sensor response and selectivity to ethanol and that the wet process, which is defined as the introduction of TiO₂ gel to ZnSnO₃ precipitants, is most efficient to enhance the gas-sensing behaviors. Microscopically, surface characterizations suggest that the improved sensing properties for the TiO₂-loaded ZnSnO₃ can be attributed qualitatively to its large specific surface area and porous morphology. A gas adsorption model based on surface physics is proposed to discuss further the mechanism behind the sensing property enhancement. This study may open up an avenue for effectively tuning gas-sensing character of ZnSnO₃, which is important for modifying functionality of other sensing materials.