基于La0.75Sr0.25Mn0.5Co0.5O3-δ敏感电极的阻抗谱型NO2传感器的研究

doi:10.3724/SP.J.1077.2011.00523

无机材料学报 ›› 2011, Vol. 26 ›› Issue (5): 523-528.DOI: 10.3724/SP.J.1077.2011.00523

基于La_0.75Sr_0.25Mn_0.5Co_0.5O_3-δ敏感电极的阻抗谱型NO₂传感器的研究

郝增川, 王岭, 戴磊, 崔广华, 李跃华

(河北理工大学化工与生物技术学院, 唐山 063009)

收稿日期:2010-08-08 修回日期:2010-11-19 出版日期:2011-05-20 网络出版日期:2011-06-07
作者简介:郝增川(1984?), 男, 硕士研究生. E-mail: tshzchuan@126.com
基金资助:
国家自然科学基金(50772030, 50972038)

Investigation on Impedencemetric-type NO₂ Sensor Based on La_0.75Sr_0.25Mn_0.5Co_0.5O_3-δ Sensing Electrode

HAO Zeng-Chuan, WANG Ling, DAI Lei, CUI Guang-Hua, LI Yue-Hua

(College of Chemical Engineering and Biological Technology, Hebei Polytechnic University, Tangshan 063009, China)

Received:2010-08-08 Revised:2010-11-19 Published:2011-05-20 Online:2011-06-07
Supported by:
National Natural Science Foundation of China (50772030, 50972038)

摘要/Abstract

摘要： 利用浸渍技术在多孔YSZ中制备了钙钛矿型纳米颗粒材料La_0.75Sr_0.25Mn_0.5Co_0.5O_3-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0~1000uL/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.

关键词: 钙钛矿, NO2传感器, YSZ, 阻抗

Abstract: The perovskite nanoparticle materials La_0.75Sr_0.25Mn_0.5Co_0.5O_3-δ were prepared in YSZ porous layer by infiltration technology. An impedancemetric-type NO₂ sensor was prepared with the nanoparticle materials as sensing electrode and YSZ as solid state electrolyte. The crystalline phase and microstructure of sensing electrode in the NO₂ sensor were investigated by XRD and SEM. The result of XRD indicated that perovskite LSCM was obtained in porous YSZ after infiltrating precursor solution and heat-treatment. SEM analysis demonstrated that the grain size of LSCM was 50-100 nm, and the LSCM nanoparticles were closely incorporated with YSZ frames in porous layer. The sensing characteristics of the present device were also investigated at 450-600℃. The results suggested that the sensor showed preferential sensitivity to NO₂ with NO₂ concentration from 0 to 1000uL/L. When frequency was fixed at 0.1 Hz, the total impedance of the sensor changed almost linearly with NO₂concentration. The real response time of the sensor to NO₂ gas was around 40s at gas flow rate of 400mL/min. It is also found that the response of sensor is stable at given time and the sensor has good anti-interference to O₂ and CO₂.

Key words: perovskite, NO2 sensor, YSZ, impedence

中图分类号:

TP212

郝增川, 王岭, 戴磊, 崔广华, 李跃华. 基于La_0.75Sr_0.25Mn_0.5Co_0.5O_3-δ敏感电极的阻抗谱型NO₂传感器的研究[J]. 无机材料学报, 2011, 26(5): 523-528.

HAO Zeng-Chuan, WANG Ling, DAI Lei, CUI Guang-Hua, LI Yue-Hua. Investigation on Impedencemetric-type NO₂ Sensor Based on La_0.75Sr_0.25Mn_0.5Co_0.5O_3-δ Sensing Electrode[J]. Journal of Inorganic Materials, 2011, 26(5): 523-528.

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基于La_0.75Sr_0.25Mn_0.5Co_0.5O_3-δ敏感电极的阻抗谱型NO₂传感器的研究

Investigation on Impedencemetric-type NO₂ Sensor Based on La_0.75Sr_0.25Mn_0.5Co_0.5O_3-δ Sensing Electrode

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