掺杂对甲醛气敏元件气敏特性的改善

Improvement of Gas Sensing-characteristics of Formaldehyde Gas Sensor by Doping

纳米材料SnO2对大多数VOC气体具有敏感性。文中以SnO2为基料制作了旁热式甲醛气敏元件,为改善甲醛气敏元件的气敏特性,选择了2%Sb,3%Sb,2%Pd,3%Pd,4种比例的掺杂材料,并以低体积分数甲醛作为测试气体,对SnO2气敏元件的气敏特性进行了测试。结果显示:掺杂2%Pd的气敏元件气敏特性良好。

Nano-SnO2 is sensitive to most of VOC. Indirect-heat formaldehyde gas sensors were made of undoped nano-SnOz, four proportions of doping materials, including 2% Sb, 3% Sb, 2% Pd and 3% Pd, were chosen to improve the gas sensitivecharacteristics of formaldehyde sensor. The gas sensitive-characteristics of SnO2 gas sensor were tested with low concentration form- aldehyde as the test gas. The result shows that the 2% Pd doped SnO2 sensor has the best gas sensitive-characteristics.