摘要
用化学共沉淀法制备出纳米CdIn2O4超微粉，研究了制备条件对材料相结构的影响．对其电导研究表明，纳米CdIn2O4的导电性受气氛影响很大，在空气中受表面吸附氧的数量和状态的影响，呈n型半导体的特性，有和SnO2一样的典型电导一温度曲线，而在氩气中则更多呈现出金属导电性．对CdIn2O4气敏性能研究表明，由CdIn2O4纳米粉制成的旁热式厚膜气敏元件在350℃对两酮有较高的灵敏度和选择性．
Nano-CdIn2O4 powders were prepared by chemical coprecipitation and solid state reaction method. The effects of preparation condition on the phase constituents of material were investigated. The results demonstrated that nano-CdIn2O4 can be obtained under the condition that at pH=7 ~ 8, the starting molar ratio Cd/In is 1.3/2 and the sintering temperature is higher than 500 ℃. The size of grain sintered at 800 ℃ for 4h is only 26nm and the grain growth activiation is about 26.8kJ/mol. The conductivity of CdIn2O4 was studied, the results revealed that the conductance of CdIn2O4 was influenced by atmosphere. The carrier is electron ionized from oxygen vacancies. In air, it was affected by the amount and state of absorbed oxygen on the surface of CdIn2O4 powder. While increasing temperature, the conductance of CdIn2O4 based sensor increases with increasing temperature from room temperature to 150 ℃and decrease with increasing temperature from 150 to 500 ℃. But in Ar, it exhibits somewhat metal conductivity, because the electron concentration is high and the mobility of electron decrease with increasing temperature. The investigation of CdIn2O4 gas-sensing properties demonstrated that CdIn2O4 based sensors have higher sensitivity and good selectivity to acetone.
基金
国家自然科学基金
