Elucidation of the contribution of modified titania films over the performance of thin film humidity sensors
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2013-05-21
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Abstract
The present research focuses on comparative measurements of the influence of complex additives on the sensitivity of humidity sensors, prepared by the sol-gel metrhod. Three different dopants were added to the primary mixture in order to improve the properties of the films, expressed in water uptake capability, as follows: Bismuth acetate (CH3COO)3Bi, Vanadium-2,4 pentadionate (C15H21O6V), and Sodium tert-butoxide (CH3)3CONa. The properties of the obtained sensors were evaluated by determination of their electrical resistances in a chamber with controlled humidity. As a result, it was experimentally established that the most significant positive effect over both the increase of sensitivity and the measurement range enlargement come from V(III)-2,4 pentadionate with Sodium tert-butoxide.