Abstract
In this study, a facile emulsion templating method was developed for the preparation of high-performance monolithic porous titania-based humidity-sensing ceramics. High internal phase Pickering emulsions (HIPEs) with internal phase of 70vol%, stabilized by short-chain amphiphilic molecules in situ modified TiO2 solid nanoparticles, were employed as templates. The obtained sensors contain a hierarchically ordered three-dimensional interconnected pore structure and exhibit high sensitivity to water vapors as well as linear response in the wide relative humidity (RH) range between 11% and 95%. The observed sensor impedance variation can be as high as four orders of magnitude, depending on the RH value. In addition, the produced sensors are characterized by the reversible response with relatively small hysteresis and thus can be reversibly operated without repeated high-temperature thermal desorption cleaning.
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