摘要
本文采用化学沉淀法合成了平均晶粒尺寸在22nm左右的超微粒SnO_2及第一过渡系金属(Mn、Fe、Co、Ni、Cu、Zn)氧化物掺杂的SnO_2气敏材料。利用综合热分析仪及X射线衍射仪对材料的热性质和物质结构进行了分析。实验表明,用纯SnO_2制备的气敏元件,无需掺杂即具有很好的灵敏度,但稳定性较差,响应恢复较慢;而经高温处理的SnO_2气体灵敏度又较低。通过对SnO_2气敏元件制备工艺及工作条件的选择,发现NiO、CuO、ZnO掺杂的SnO_2元件具有工作温度低(100～250℃)、响应速度快(<10s)、恢复时间短(<30s)、及灵敏度和稳定性良好的特点,是一类很有发展前途的气敏材料。
SnO2 and doped SnO2 ultrafines with Mn,,Fe,Co,Ni,Cu,Zn and other transition metal oxides are made by chemical deposition. The average particle size of the materials has only about 22nm. Their structure and thermal properties are measured by means of XRD and DTA-TG. Undoped SnO2 gas sensor is possessed of good sensitivity, but its stability, responsibility and recoverability are not well, and its gas sensitivity is very low if it is annealed at 700℃. The new gas-sensing materials have been observed by doping CuO,ZnO and NiO to SnO2. The main merits of such materials are: very quick in response(<10 s) ,short recoveratime(<30 s) , high sensitivity (>10) ,good stability and selectivity.
出处
《郑州轻工业学院学报》
1991年第4期10-15,共6页
Journal of Zhengzhou Institute of Light Industry（Natural Science）
关键词
SNO2
气敏材料
气体传感器
gas-sensing materials based on SnO2, preperation of ultrafine powder, gas sensor,transition metal oxides
