WATER VAPOURS SENSING MECHANISM BASED ON BATIO3 DOPED ZNO NANOCOMPOSITE THICK FILMS SENSOR

Abstract

The ZnO and BaTiO3 nanoparticles were synthesized by a co precipitation method. The structural and compositional characterization has been studied by using X-ray powder diffraction (XRD). The sensors are made in the form of thick film. The Surface morphologies of the prepared samples were analyzed using Field Emission Scanning electron microscopy (FE-SEM) for thick film. Further, Water vapour or humidity sensing investigations of these sensing materials were done. Our result indicates that ZnO- BaTiO3 in form of thick film sensor with different molecular weight ratio was most sensitive for humidity in comparison to pristine material under same conditions. The hysteresis plot between increasing and decreasing the RH range from 30-90% RH and vice versa has been studied. The samples resistance of ZB1 decreases 1010 Ω to 106 Ω in comparison with the pristine materials. The similar change was also observed in sensitivity.