NO_(2)传感材料合成及其气敏特性分析

Synthesis and gas sensitivity analysis of NO_(2)sensing materials

局部放电是空气开关柜一种较为常见的电气现象,会引起绝缘介质劣化,甚至导致绝缘破坏。气体组分分析法通过检测空气开关柜中放电产生NO_(2)的含量可以确定局部放电程度。该文采用水热法合成PdO修饰的多孔纳米ZnO材料,制作可用于检测局部放电特征气体NO_(2)的气体传感器。研究表明:传感器在250℃的最优工作温度下,对体积分数为100×10^(-6)NO_(2)气体响应为44.06,响应时间为24 s,恢复时间为29 s,检测下限为0.1×10^(-6),且灵敏度与NO_(2)浓度呈现良好的线性关系,可为气体组分分析法检测局部放电提供参考。

Partial discharge is a common electrical phenomenon in air switchgear,which can cause the deterioration of insulation media and even lead to insulation damage.Gas component analysis method can determine the degree of partial discharge by detecting the content of NO_(2)in the air switch cabinet.In this paper,PdO-decorated porous nano-ZnO materials were synthesized by hydrothermal method to make a gas sensor which can be used to detect partial discharge characteristic gas NO_(2).The results show that the sensor has a sensitivity of 44.06 to 100×10^(-6) NO_(2)gas,with a response time of 24 s,a recovery time of 29 s,a limit detection of 0.1×10^(-6),and a good linear relationship between sensitivity and NO_(2)concentration,which can provide reference for gas component analysis to detect partial discharge in air switchgear.