Optical Properties of Nanocrystalline TiO2/CuO Core-Shell Thin Films by Thermal Annealing
American Journal of Nano Research and Applications
Volume 3, Issue 3, May 2015, Pages: 62-65
Received: Feb. 24, 2015; Accepted: Apr. 22, 2015; Published: May 11, 2015
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Authors
Onah D. U., Department of Industrial Physics, Ebonyi State University, Abakaliki, Nigeria; Department of Physics and Astronomy University of Nigeria Nsukka, Enugu State, Nigeria
Ugwu E. I., Department of Industrial Physics, Ebonyi State University, Abakaliki, Nigeria
Ekpe J. E., Department of Industrial Physics, Ebonyi State University, Abakaliki, Nigeria
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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.
Keywords
Tio2/Cuo, Direct and Indirect Transitions, Uv Transmittance, Annealing, Band Gap
To cite this article
Onah D. U., Ugwu E. I., Ekpe J. E., Optical Properties of Nanocrystalline TiO2/CuO Core-Shell Thin Films by Thermal Annealing, American Journal of Nano Research and Applications. Vol. 3, No. 3, 2015, pp. 62-65. doi: 10.11648/j.nano.20150303.15
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