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SO2 sensing performance of chemically sprayed WO3- V2O5 nanocomposites thin films
J. M. Patil, S. B. Patil, R. H. Bari, and A. N. Sonar
WO3, V2O5, and WO3-V2O5 nanocomposites thin films were prepared by spray pyrolysis method onto the heated glass substrate at 350 oC. The films were fired at 500 oC. As prepared thin films were studied using XRD, FE-SEM and EDAX to know crystal structure, surface morphology and elemental composition. The gas sensing performance of pure WO3, V2O5, and different composition of WO3-V2O5 was studied on exposure of different conventional gases for 500 ppm. The film sprayed for composition of WO3-V2O5 (Sample =S4) was observed to be most sensitive (S = 1130) to SO2 at 350 oC. The sensor shows quick response (4 s) and fast recovery (8 s) time. The results are discussed and interpreted. Keywords: Spray Pyrolysis, WO3-V2O5 nanocomposites, SO2 gas sensing, quick response, fast recovery.[Full Text Article]