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Investigation of the Optical Parameters of Nanocrystalline TiO2/CoO Core-Shell Thin Films

Author: 
Daniel U. Onah and Edwin H. Uguru
Subject Area: 
Physical Sciences and Engineering
Abstract: 

Investigation of the optical parameters of nanocrystalline TiO2/CoO Core-Shell Thin Films was done within the UV, Visible and NIR regions. XRD analysis confirmed orthorhombic nanocrystralline structure for TiO2/CoO Core-Shell Thin Films. The optical parameters of interest in this article were energy dispersion, refractive indices (n), reflectance (R) and extinction coefficients (k). The dependence of these parameters on the post deposition (annealing) temperature was particularly studied. Results showed that: refractive indices have the same maximum value of 2.25 each at a frequency of 4.83 X 1014Hz in IR region. The reflectance of the as-deposited film sample and the samples annealed at 373K and 473K fluctuated in the wavelength range from 260-400nm, while the reflectance of the samples annealed at 573K and 673K respectively, increased directly with wavelengths and annealing temperatures in the visible region. Samples annealed at higher temperature have higher extinction coefficients with a peak vale of 90 each.

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