Investigation on Impedencemetric-type NO2 Sensor Based on La0.75Sr0.25Mn0.5Co0.5O3-δ Sensing Electrode

doi:10.3724/SP.J.1077.2011.00523

Abstract

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

CLC Number:

TP212

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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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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