Recently, with the aim to improve sensor performances, several investigations on the effect of light (usually UV) have been performed 1,2. The basic idea is arising from the fact that some metal oxides, known for their good sensing capabilities, also show photocatalytic behavior. This work is aimed to investigate the chance offered by this technique of decreasing the working temperature even down to room one as well as to improve the recovery times in dynamical measurements. Moreover, to better approach the problem, two functional materials, ZnO and WS (a solid solution of W and Sn oxides, with Sn:W=10:90) both successfully tested as ozone sensors, have been examined with and without UV light
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