High Performance Mixed Potential Type NO2 Gas Sensor Based on Porous YSZ Layer Formed with Graphite Doping
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Published on: February 4, 2016
Hao Hong1, Jianwen Sun2,3, Cinan Wu1
1College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, China.
Abstract:
High performance mixed potential type NO2 sensors using porous yttria-stabilized zirconia (YSZ) layers doped with different concentration graphite as solid electrolyte and LaFeO3 as sensing electrode were fabricated and characterized. LaFeO3 was prepared by a typical citrate sol-gel method and characterized using XRD. The surface morphology and porosity of porous YSZ layers were characterized by field emission scanning electron microscope (FESEM). The sensor doped with 3 wt% graphite shows the highest response (-76.4 mV to 80 ppm NO2) and the response is linearly dependent on the logarithm of NO2 concentration in the range of 10-200 ppm. The sensor measurement results also present good repeatability and cross-sensitivity.
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