synthesis, humidity sensing, photocatalytic and antimicrobial properties of thin film nanoporous pbwo4-wo3 nanocomposites

a humidity sensor thin film based on nanoporous pbwo4-wo3 composites has been prepared by spin coating technique with different weight ratio of pbwo4 (pb) and wo3 (wo) (pwwo-01, pwwo-82, pwwo-64, pwwo-46, pwwo-28, pwwo-01) and their humidity sensing properties have also been investigated at different relative humidity (rh) in the range of 5% - 98% at room temperature with dc resistance. it is found that composite pwwo-28 show best humidity sensing properties with the sensitivity factor value of (sf) 3733. the response and recovery time of humidity sensor are about 50 s and 120 s, respectively. high sensitivity, narrow hysteresis loop, rapid response and recovery, prominent stability and good repeatability are obtained. synthesized pbwo4-wo3 composites were characterized by power x-ray diffraction (xrd), field emission scanning electron microscopy (fesem), transmission electron microscopy (tem), bet and photoluminescence (pl) studies. the photocatalytic result demonstrated photocatalytic efficiency of nonporous pwwo-28 composite. the antimicrobial activity of the composites was determined by disc diffusion method.