Control of the WO3 crystalline morphologies by hydrothermal synthesis method and study of the high sensitivity sensors for practical NO2 detection

Abstract

Cuboid WO3 particles were prepared by precipitation method and hydrothermal synthesis. Sensing properties of the cuboid WO3 film sensor to dilute NO2 were studied. Temperature dependence on the sensing properties and effects of interference gases were investigated. Practical evaluation of the WO3 film sensor at roadside atmosphere was carried out and it was demonstrated that the measurement values obtained by the present sensor unit had equivalent accuracy and resolution with CLD detection without any maintenance and calibration for 10 weeks.