甲醛气体传感器的研究

以纳米材料SnO_2、Zn O为原料的气敏传感器对大多数VOC气体具有敏感性.以SnO_2和ZnO为基料制作旁热式甲醛气敏元件,并比较二者的气敏特性.选用对甲醛敏感的SnO_2材料作为元件基料,为改善其对甲醛的气敏特性,选择0.3%La_2O_3、0.5%La2O3、0.7%La_2O_3的3种比例掺杂,运用控制变量法分别在不同烧结温度和不同工作温度下进行测试.结果表明:掺杂0.3%La_2O_3的SnO_2气敏元件在烧结温度为700℃,工作温度为300℃下对甲醛的气敏特性良好.

Study of the formaldehyde gas sensor

The gas-sensitive sensors made with SnO_2 and Zn O are sensitive to most VOC gases. Beside-heated formaldehyde gas sensors with SnO_2 and Zn O are introduced and gas-sensing properties are discussed in this paper.Formaldehyde-sensitive SnO_2 is chosen as the base material,0. 3% La_2O_3,0. 5% La_2O_3 and 0. 7% La_2O_3 are used to optimize the gas-sensing properties. The controlling variable method is applied in this case at different sintering temperatures as well as different working temperatures. The result shows that the gas sensors with 0. 3% SnO_2 have a better gas-sensing property at the sintering temperature of 700 ℃ and the working temperature of 300 ℃.