Abstract
Different synthetical routes involving several solvents for obtaining WO 3 powders, suitable for gas sensing have been studied. Aqueous and alcoholic solvents proved to be the most promising media to grow nanometric particles. Among these, a modified sol–gel route that involves ethanol and a di-chetone, highlighted a more homogeneous grain-size distribution. The structure and morphology evolution of pure WO 3 powders with time and annealing temperature have been studied. The study of the energy barrier and conductance versus temperature allows to understand the reason for the high response of WO 3 to oxidising gases and its lack of sensitivity to reducing agents. Films of WO 3 responded to NO 2, sensing as low a gas concentration as 200 ppb.
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