Nano-powders Zinc Oxides (ZnO) were synthesized using chemical bath deposition method. Powders were then used to make thick films on glass substrate by using standard screen printing technique. These films were dried and fired at 4000C temperature for two hours in air atmosphere. The Morphological, Compositional and Structural properties of the ZnO thick films were performed by Scanning electron microscopy (SEM), Energy Dispersive Spectroscopy (EDAX) and XRD technique respectively. Chemical composition of nano ZnO film samples changes with firing temperature showing non-stoichiometric behaviours. XRD study indicated the formation of polycrystalline ZnO films with hexagonal wurtzite structure. I have explored NH3 sensing properties of the nano powders ZnO thick films at 50 0C temperature.
