气敏材料是一种重要的功能材料。 目前室温可见光照射激发的n型半导体的气敏研究工作很少， 并且通常存在着灵敏度不够高的缺点。本项目将主要探索：在适当高的温度下， 可见光照射下的p-型纳米钙钛矿稀土铁基氧化物对各种还原性气体（甲醛、CO、丙酮、甲醇、乙醇、甲酸气体、汽油气体、液化石油气等）的气敏响应特性以及规律。 测定纳米钙钛矿稀土铁基氧化物的禁带宽度以及温度特性。 研究p-型钙钛矿稀土铁基氧化物中可见光照气敏灵敏度增强以及响应灵敏度随光照功率、光照波长变化等的规律。并进一步弄清贵金属以及二价碱土金属掺杂对钙钛矿稀土铁基氧化物的可见光照气敏的增强效应。 本项目创新揭示在较高温度时，可见光照射下p-型半导体材料的气敏规律与机制；同时研究n-型尖晶石铁基氧化物的可见光照气敏性。本项目还将发展出对某些气体具有高灵敏度的新型可见光照气敏器件。本项目不仅具有重要的科学研究意义，而且有重要应用前景。

The gas sensor is one kind of important functional materials. The research works on gas sensing of n- type semiconductors under visible light irradiation are now very few, and their sensing sensitivities are not higher enough. This project aims to investigate the gas sensing properties and sensing mechanism of p-type rare earth- iron perovskite oxides (such as formaldehyde, CO, acetone, methanol, ethanol, gasoline gas, liquefied petroleum gas) under visible light irradiation at appropriate higher temperatures. We will measure the band-gap and its temperature dependence of p-type rare earth- iron perovskite nano- oxides. The enhancement of gas sensing sensitivity of rare earth- iron perovskite nano- oxides induced by the visible light irradiation, and its change with the light power and light wavelength will be analyzed. We will also clarify the doping effect of noble metal and divalent alkaline earth ions in rare earth- iron perovskite oxides on the enhancement of gas sensing response under visible light irradiation. We will reveal the sensing principle and mechanism of p-type semiconductor under visible light irradiations. Meanwhile，we will also investigate the gas sensing of n-type spinel ferrites under visible light irradiation. We will also develop the novel light irradiation gas sensors with high sensitivity to certain gases. This project is of significance for both scientific research and potential applications.