Abstract
The optical properties of TiO2/CuO core-shell thin films were studied after the as-deposited nanocrystalline core-shell thin films were annealed at different temperatures [373K – 673K]. Orthorhombic nanocrystalline structure induced by thermal annealing for the films as confirmed by XRD analysis was observed. The optical properties were obtained from the absorption and transmittance data in the range of 200- 1200nm. The increase in transmittance with increased wavelengths in UV region was not sharp. This indicated that the studied films have both direct and indirect transitions. Annealing was found to have more particular effect on the transmittance within the UV window. The band gaps of the film samples ranged within 1.2eV and 3.7eV to 4.0eV.
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