Pr6O11/SnO2复合材料的制备及对异丙醇气敏特性的研究

通过水热法和退火处理制备了不同Pr浓度(0%,1%,2%,4%)的Pr6O11/SnO2复合材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和X射线光电子能谱仪(XPS)等方法对制备材料的物相结构、微观形貌和元素组成进行了表征,并制成旁热式气敏元件,对异丙醇气体进行气敏测试。实验结果表明,基于2%样品的Pr6O11/SnO2气体传感器的气敏性能最佳,在最佳工作温度200℃下对100×10^-6异丙醇气体响应达到16.2,是纯相SnO2传感器响应的2.3倍。最后,对基于Pr6O11/SnO2复合材料气体传感器的气敏机理进行了分析讨论。

Preparation of Pr6O11/SnO2 Composites and Their Gas Sensing Properties for Isopropanol

Different Pr concentrations(0%,1%,2%,4%)of Pr6O11/SnO2 composites were prepared by hydrothermal method and annealing treatment.The phase,microstructures and elemental compositions of the materials were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).They were fabricated to side-heated gas sensors and for isopropanol gas testing.The experimental results showed that the Pr6O11/SnO2 gas sensor based on the 2%sample has the best gas sensing performance.At the optimal operating temperature of 200℃,its response to 100×10^-6 isopropanol is 16.2,which is 2.3 times that of the pure SnO2 gas sensor.Finally,the gas sensing mechanism of the gas sensor based on Pr6O11/SnO2 composites was analyzed and discussed.