Effect of Ag2O Doping on the H2S Gas Sensing Properties of WO3 Nanosensor

In this paper we report the synthesis and characterization of tungsten oxide doped silver oxide nanostructures. The effect of silver doping on the optical and sensing properties of tungsten doped silver oxide is studied and characterized for low-temperature H ₂ S gas detection. Furthermore, we investigated the sensor response, electrical characteristics, response time of tungsten oxide (WO ₃ ) and tungsten oxide doped with silver oxide (Ag ₂ O/ WO ₃ ) at different concentrations at 25°C. The study also presents the influence of the silver oxide doping of WO3 on the H ₂ S based sensors performance in terms of sensitivity and response time. The obtained results proved the possibility of synthesizing tungsten oxide-based gas sensors for future H ₂ S sensor devices. UV-VIS results reveal that doping WO ₃ with Ag ₂ O enhanced the absorption of WO ₃ in the visible region which is indicated in the red shift. Furthermore, the sensing properties of WO ₃ is increased compared to bare WO ₃ and Ag ₂ O which shoed no response to H ₂ S in this temperature range. The electrical properties of WO ₃ also becomes ohmic as a result of Ag ₂ O doping. The study illustrates a good way to improve the gas sensors performance through Ag ₂ O doping.