W-Sn Mixed Oxides: New Materials for Gas Sensing

Thick films of tungsten trioxide (WO), tin dioxide (SnO), and tungsten-tin (W-Sn) mixed oxides at different nominal Sn molar fraction (0.1 and 0.3) were prepared. The functional materials were synthesized and characterized by SEM, X-ray diffraction, specific surface area measurements (BET), UV-Vis-NIR and IR spectroscopies. The gas sensing measurements highlighted that the mixed oxides based sensors offer a better response towards NO with respect to pure WO being almost insensitive to CO.