Growth and Characterization of Multilayer NiO/Ag and NiO/Al Structures for Energy Saving Heat Mirrors

Optically Transparent multilayer NiO/Ag and NiO/Al heat mirrors were prepared,which allow the visible radiation to pass through themand reflect the Infrared radiation. NiO thin filmswere deposited by the sol-gel spin coating technique, and Ag and Al thin films were prepared by thermal evaporation. XRD analysis showed the formation of a cubic structure of NiO. The chemical analysis reveals that the Ni2O3phase is also present along with the NiO phase. The transmittance spectra of NiO/Ag and NiO/Al coatingsshowed good transmittance in the visible region,while being highly reflective in the infrared region. XRDanalysis of the film showed the formation of a cubic structure of NiO. The chemical analysis showed that some peaks belongto another phase of the NiO. The transmittance spectra of multilayersof NiO/Ag and NiO/Al films are transparent in the visible region and reflect well in the infrared region.