论文部分内容阅读
利用浸渍技术在多孔YSZ中制备了钙钛矿型纳米颗粒材料La0.75Sr0.25Mn0.5Co0.5O3-δ(LSCM),并以其为敏感电极,YSZ为固体电解质组成了阻抗谱型NO2传感器.使用XRD和SEM研究了传感器敏感电极的相组成和微观结构.XRD分析结果表明,经前驱体溶液浸渍和热处理后,在YSZ多孔层中生成了钙钛矿结构的LSCM.扫描电镜分析表明敏感电极颗粒粒径为50～100nm,且与YSZ多孔层结合紧密.传感器敏感性能实验结果表明,在温度范围为450～600℃,NO2浓度范围为0～1000μL/L时,传感器对NO2有良好的敏感性,频率为0.1Hz时的总阻值与NO2的浓度之间呈良好的线性关系.在气体流速为400mL/min时,获得的传感器对NO2的真实响应时间约为40s,且响应信号稳定.传感器对O2和CO2具有良好的抗干扰性能.
The perovskite-type nanoparticle material La0.75Sr0.25Mn0.5Co0.5O3-δ (LSCM) was prepared by impregnation technique in porous YSZ. The impedance-coupled NO2 sensor was fabricated by using it as a sensing electrode and YSZ as a solid electrolyte. XRD and SEM were used to investigate the phase composition and microstructure of the sensor-sensitive electrode.XRD results showed that LSCM with perovskite structure was formed in the YSZ porous layer by impregnation and heat treatment of the precursor solution.SEM analysis showed that the sensitive electrode The particle size is 50 ~ 100nm, and it is tightly bonded with YSZ porous layer.The experimental results of sensor sensitivity show that the sensor has a good sensitivity to NO2 at the temperature range of 450 ~ 600 ℃ and NO2 concentration of 0 ~ 1000μL / L When the gas flow rate is 400mL / min, the real sensor response time to NO2 is about 40s, and the response signal is stable. The sensor has good anti-interference performance for O2 and CO2.