掺杂合成纳米α-Fe_2O_3粉体及其气敏性能研究

Study on adulteration synthesis and gas sensitive properties of nanometer α-Fe_2O_3 powders

采用溶胶—凝胶法制备Eu2O3-Fe2O3（Eu2O3的质量分数为0-7％）纳米粉体材料，利用X射线衍射仪、透射电镜等测试手段分析了材料的微观结构，并进行了气敏性能测试。结果表明：合成的产物颗粒均匀、粒径细小。其中，质量分数为5％Eu2O3的烧结型气敏元件在145℃条件下对H2S有较高的灵敏度、较好的选择性及响应一恢复特性，线性检测范围较宽，有望研制成气敏性能较为优异的H2S敏感材料。

The nanocrystals of Eu-doping a-Fe2O3 （ quality fraction of Eu2O3 is 0 - 7 % ） are prepared by sol-gel method in the citric acid system. By means of XRD and TEM, microstrueture is analyzed. The gas-sensing properties of sensors are also measured. Obtained results show that the grain size becomes reqular and smaller, the sensor has high sensitivity, good selectivity, response-recovery characteristic and wide linear measurment range to H2S when quality fraction of Eu2O3 is 5 % and optimum working temperature is 145 ℃. It is hopeful of developing into a new type of H2S sensing material.