Synthesis and characterization of ZnO-TiO2 nanocomposite and its application as a humidity sensor

A detailed study is reported of the synthesis and characterization of a ZnO-TiO2 nanocomposite and its application as a humidity sensor. Variations of resistance with relative humidity have been observed. The sensitivity of the sensor at different temperatures has also been calculated. Scanning electron micrographs and X-ray diffraction patterns of the sensing material were obtained at different temperatures. The minimum size of nanoparticles is found to be 50 nm at room temperature (19 degrees C). The highest sensitivity observed at room temperature was 18 M Omega/% RH. Kelvin radii, which are the radii of pores, have also been studied; their average value at ambient temperature (19 degrees C) is found to be 8.35 angstrom.