writer：Zhang C., Boudiba A., De Marco P., Snyders R., Olivier M., Debliquy M.
keywords：Tungsten oxide, Gas sensors, Nitrogen dioxide, Visible-light illumination, Room temperature
source：期刊
specific source：Sensors and Actuators B Chemical
Issue time：2013年
In this paper, the effects of visible-light illumination on sensing properties of tungsten trioxide (WO₃) sensors have been investigated. WO₃ sensitive films are prepared on alumina substrates by screen-printing. WO₃sensors illuminated by visible/ultra-violet lights are submitted to sensing tests with 160 and 320 ppb nitrogen dioxide (NO₂) at room temperature. NO₂ sensing characteristics of the WO₃ sensor are significantly improved by illumination as compared to that in the dark. Influences of light wavelength and light intensity on the sensing characteristics are further studied. The results show that visible light can effectively activate the WO₃ sensors and blue light is a good choice to produce room-temperature devices which are suited for NO₂sensing applications. A sensing mechanism is proposed according to a simple adsorption–photodesorption model.