Ultraviolet-Induced Gas Sensing Performance of Ag/WO3/rGO Nanocomposites for H2S Gas Sensors

The attention toward cost-effective and high-performanceH(2)S sensors is increasing due to the growing need for physicalhealth and environmental monitoring. In this paper, Ag/WO3/reduced graphene oxide (rGO) nanocomposites were synthesized byusing a microwave-assisted gas-liquid interfacial method. Nanomaterialswith different Ag doping contents were successfully prepared withAgNO(3) as an additive. The Ag/WO3/rGO sensorsexhibit remarkable selectivity toward H2S, and the gassensing performances of Ag-doped WO3/rGO gas sensors aresignificantly better than those of WO3/rGO. At 150 & DEG;C,the response value of the 10 wt % Ag/WO3/rGO gas sensorto 100 ppm H2S is 204.5, which is 7 times higher than thatof WO3/rGO, and the response/recovery time of the sensoris 9/49 s, respectively. Additionally, the gas sensing performanceof the sensor is further enhanced under ultraviolet (UV) irradiation.The response value is enhanced to 685.8, which is 3 times higher thanthat without UV irradiation, and the response/recovery time is reducedto 8/38 s, respectively. The sensing mechanism is also discussed.This work offers a potential application for H2S detectionin environmental monitoring and smart healthcare.