MO_2-α-Fe_2O_3材料的气敏特性

GAS SENSING EFFECT OF MO_2-α-Fe_2O_3 MATERIALS

采用化学共沉淀的方法合成了Sn^(4+),Ti^(4+),Zr^(4+)掺杂的。α-Fe_2O_3气敏陶瓷材料。用X射线衍射仪和透射电子显微镜分析了材料的微观结构及化学组成。用RQ-1型气敏元件特性测试仪测试了掺杂元素、掺杂量、工作温度,检测气体等对α-Fe_2O_3气体灵敏度和工作阻值的关系。结果表明:少量MO_2(M=Sn,Ti,Zr)的掺杂能显著提高α-Fe_2O_3的气体灵敏度,并且能够降低。α-Fe_2O_3气敏元件的工作电阻,有利于α-Fe_2O_3气敏材料的实用化。

Gas sensing materials of α-Fe2O3 doped with MO2(M=Sn,Ti,Zr) are made by chemical coprecipitation. Its microstructure and composition are analyzed according to X-ray diffraction and transmission electron micrography. Its gas sensing parameters are measured with RQ-1 type gas sensitivity measurer. From experimental results,It can be known that adding MO2 can greatly increase gas sensitivity, decrease working temperature and resistance of α-Fe2O3.