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利用浸渍技术在YSZ多孔层中制备NiO纳米颗粒材料,并以其为敏感电极组成新型的电流型NO2传感器。采用X射线衍射仪、扫描电子显微镜表征了NO2传感器物相和形貌结构,应用IM6e型电化学工作站测试了其气敏性能。实验结果表明:NiO颗粒粒度约50nm,且分布均匀。在500~600℃时,传感器对NO2有良好的敏感性,其响应电流值与NO2的浓度之间呈良好的线性关系。传感器对NO2响应时间短且响应信号稳定。O2和CO2的存在对传感器响应信号几乎没有影响。
NiO nanoparticle material was prepared in YSZ porous layer by impregnation technology, and a novel current-type NO2 sensor was constructed by using it as a sensitive electrode. The phase and morphology of NO2 sensor were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The gas sensitivities of NO2 sensor were tested by IM6e electrochemical workstation. The experimental results show that: NiO particle size of about 50nm, and uniform distribution. At 500 ~ 600 ℃, the sensor has a good sensitivity to NO2, and the response current value has a good linear relationship with NO2 concentration. The sensor response time to NO2 is short and the response signal is stable. The presence of O2 and CO2 has almost no effect on the sensor response signal.