CeO_(2)/Fe_(2)O_(3)复合物的制备及其对二甲苯的气敏性能

Preparation of CeO_(2)/Fe_(2)O_(3)Composites and Their Gas Sensing Properties to Xylene

采用溶剂热法制备不同Ce和Fe摩尔比的CeO_(2)/Fe_(2)O_(3)复合物,利用扫描电子显微镜(SEM)对其形貌结构进行表征,发现反应物的含量对样品的形貌有显著影响。进一步制备了不同摩尔比复合材料的传感器,并对传感器进行二甲苯的气敏性能研究。实验测试结果显示,Ce1Fe1传感器对于二甲苯的气敏性能最优,在二甲苯体积分数为1×10^(-4)时传感器的响应为40.3。而且该传感器在最佳的工作温度260℃下,对体积分数为2×10^(-6)~5×10^(-4)的二甲苯气体有着优异的线性度,对于体积分数为1×10^(-4)的其他干扰气体具有不错的选择性。同时,该传感器还具有良好的重复性和长期稳定性。最后阐述了CeO_(2)/Fe_(2)O_(3)传感器的气敏增强机理。

The CeO_(2)/Fe_(2)O_(3)composites with different mole ratios of Ce and Fe were prepared by solvothermal method.The morphologies and structures of the as-prepared samples were characterized by scanning electron microscope(SEM).It is found that the content of reactants has significantly effect on the morphologies of the samples.Furthermore,the sensors with different mole ratios of composites were prepared and the gas sensing properties of the sensors to xylene were studied.The experimental test results show that the Ce1Fe1sensor has the best gas sensing properties to xylene,and the response of the sensor is 40.3 when the volume fraction of xylene is 1×10^(-4).Moreover,the sensor has excellent linearity to xylene gas with the volume fraction of 2×10^(-6)-5×10^(-4)at an optimal operating temperature of 260℃,and has good selectivity for other interfering gases with a volume fraction of 1×10^(-4).Meanwhile,the sensor has well repeatability and long-term stability.Finally,the gas sensing enhancement mechanism of the CeO_(2)/Fe_(2)O_(3)sensor was described.