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Influence of Gamma irradiation on the structural and optical characteristics of Li ion-doped PVA/PVP solid polymer electrolytes

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Abstract

Lithium ions-doped polyvinyl alcohol/polyvinyl pyrrolidone (PVA/PVP) films were prepared by solution casting technique and exposed to 100 kGy gamma radiation. The structural modifications in the samples before and after irradiation were studied using X-ray diffraction XRD and UV–Vis spectroscopy. The results indicated that absorbance \( A\,(\lambda ) \) and absorption index (k) increased, while semicrystalline nature of the blend decreased due to the addition of Li2SO4 and irradiation. The optical band gap \( E_{\text{g}}^{\text{opt}} \) of the composites showed significant decrease from 2.98 to 2.196 eV by adding Li2SO4 and from 2.83 to 2.08 eV after irradiation due to cross-linking. The Tauc’s relation indicated that allowed transitions are indirect for both irradiated and unirradiated samples. The Urbach energy (\( E_{\text{u}} \)) increased with increasing Li ion content and exposure to γ irradiation. The dependence of dielectric permittivity \( \varepsilon_{1} \), dielectric loss \( \varepsilon_{2} \) and optical conductivity \( \sigma_{opt} \) on photon energy \( h\nu \) was also studied.

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Ismail, A.M., Mohammed, M.I. & El-Metwally, E.G. Influence of Gamma irradiation on the structural and optical characteristics of Li ion-doped PVA/PVP solid polymer electrolytes. Indian J Phys 93, 175–183 (2019). https://doi.org/10.1007/s12648-018-1286-1

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  • DOI: https://doi.org/10.1007/s12648-018-1286-1

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