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Indian Journal of Physics

, Volume 93, Issue 2, pp 175–183 | Cite as

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

  • A. M. IsmailEmail author
  • M. I. Mohammed
  • E. G. El-Metwally
Original Paper
First Online:
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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.

Keywords

Polymer blend Gamma irradiation XRD UV/Vis. Optical energy gap 

PACS Nos.

42.70.Jk 78.20.-e 78.20.Ci 
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Copyright information

© Indian Association for the Cultivation of Science 2018

Authors and Affiliations

  • A. M. Ismail
    • 1
    Email author
  • M. I. Mohammed
    • 1
  • E. G. El-Metwally
    • 1
  1. 1.Physics Department, Faculty of EducationAin Shams UniversityRoxyEgypt

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