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Effects of post-thermal treatments on morphological and optical properties of NiO/Ni(OH)2 thin films synthesized by solution growth |
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| Authors: | Solomon U. Offiah Mary O. Nwodo Assumpta C. Nwanya Sabestine C. Ezugwu Solomon N. Agbo Paulinus U. Ugwuoke Rose U. Osuji Maaza Malik Fabian I. Ezema |
| Affiliation: | 1. National Centre for Energy Research and Development, University of Nigeria, Nsukka, Nigeria;2. Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria;3. Department of Physics and Astronomy, University of Western Ontario, Canada;4. Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, PO Box 722, Somerset West 7129, Western Cape Province, South Africa;5. UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa |
| Abstract: | Room temperature deposition of PVP capped nanostructured NiO/Ni(OH)2 thin film, the morphological and optical characterizations by solution growth technique are reported. The nanostructured thin films which were deposited on optical glass substrates were annealed at different temperatures and then subjected to structural, morphological and optical characterizations. X-ray diffraction measurements of the films revealed that higher temperatures during the thermal treatment enhanced the crystallinity of the thin films. The SEM surface micrographs show non-interconnected uniformly deposited fibre-like structures with approximate lengths between 400 and 1200 nm. The optical band gap energy roughly decreased from about 2.7 eV to about 2.2 eV with thermal treatment. The absorbance of the thin films annealed at 300 and 400 °C was as high as 90% in the visible region of the electromagnetic spectrum. These materials could be useful in solar thermal conversion processes. |
| Keywords: | Solution growth Morphology SEM Crystallinity Band gap energy |
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