Sensing Properties of Sub-ppm Level NO_2 Gas Sensor Based on YSZ and WO_3 Sensing Electrode

摘要

In this paper, the gas sensors using WO_3 as sensitive electrode, Pt mixed potential as the reference electrode was researched. The structures and preparation methods of the sensors were introduced. Besides, the sensitive materials, the electrode surface and the section morphologies were characterized by means of SEM and EDS. Furthermore, the sensing properties of the as-fabricated sensors were examined under different NO_x concentrations and temperatures (500°C, 550°C and 600°C). The results revealed that the response signal become smaller with the temperature increasing, and stronger with the increasing of the NO_2 concentration.