Abstract
Abstract Nanopowders of pure and of Mn-, Ta- and Zr-loaded (5 wt.%) WO 3 were prepared and printed as thick films. Investigation of the influence of the doping on morphology, structure and gas response versus NO 2 has been performed. Pure nanometric WO 3 was prepared by a modified sol–gel synthesis while loading was carried out by impregnation with Mn(II), Ta(V) and Zr(IV) chlorides. Addition of Ta resulted in grain coalescence and phase transition inhibitions in the layers with respect to pure WO 3 films, being the effect strongly enhanced in the films fired at 850 °C. The Ta-doped films turned out to be the most sensitive films with a response extending down to the sub-ppm domain.
Published Version
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