This work reports the mechanochemical synthesis of ZnO nanoparticles. ZnO thick films were deposited on glass substrate by using standard screen printing technique and fired at 4500C for two hours.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. We have explored H2S sensing properties of the nano powders ZnO thick films at 300 0C temperature.
