Cerium (III) doping effects on optical and thermal properties of PVA films |
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| Authors: | M Abdelaziz |
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| Institution: | 1. Natural Science Department, Community College of Riyadh, King Saud University P.O. Box 28095, Riyadh 11437, Kingdom of Saudi Arabia;2. Department of Physics, Faculty of Science, Mansoura University, Mansoura 35516, Egypt;1. Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India;2. Department of Biotechnology & Biomedical Engineering, NIT Rourkela, Orisa, India;3. Department of Physics, Jadavpur University, Kolkata 700 032, India;1. Innovation Centre – Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia;2. Institute for Multidisciplinary Research, University of Belgrade, Kneza Vi?eslava 1, 11000 Belgrade, Serbia;3. Centre for Solid State Physics and New Materials, Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade-Zemun, Serbia;4. Department of General and Inorganic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia;1. Physics Department-Faculty of Science-AL Faisaliah Campus, King Abdul Aziz University, Jeddah, Saudi Arabia;2. Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia;3. Nano-Science & semiconductor Labs., Thin Film Lab., Department of Physics, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt;4. Research chair of Exploitation of Renewable Energy Applications in Saudi Arabia, Physics & Astronomy Dept., College of Science, King Saud University, P.O.Box 2455, Riyadh 11451, Saudi Arabia |
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| Abstract: | Cerium chloride (CeCl3) doped polyvinyl alcohol (PVA) films were prepared by casting technique. The effect of CeCl3 concentrations on the structural, optical and thermal properties of the PVA films was studied by X-ray diffraction (XRD), FT-IR, UV-visible, transmittance (T), reflectance (R), differential scanning calorimetry (DSC) and thermogravimetry (TG). Both of the XRD and the DSC results affirm the increase in amorphousity. Absorption spectra of the doped films have shown an absorption band at 260 nm assigned to the trivalent state of cerium ions. Absorption, transmittance and reflectance spectra were used for the determination of the optical constants. The results indicate that the optical band gap (Eg) was derived from Tauc's extrapolation and decreases with the cerium content. The refractive index increases with monotonic behavior as the cerium content increases. The dispersion of the refractive index is discussed in terms of the single-oscillator Wemple–DiDomernico model for obtaining the dispersion parameters. The obtained optical parameters were found to be strongly affected by CeCl3 dopant. Thermal analysis showed that the thermal parameters of PVA are enhanced by CeCl3. The dependence of the activation energy of the decomposition temperature on doping level was estimated. |
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