Effect of the dopant salt on the optical parameters of PVA:NaNO3 solid polymer electrolyte

  • Fahmi Fariq MuhammadEmail author
  • Shujahadeen B. Aziz
  • Sarkawt A. Hussein


In this work we investigate the impact of the dopant salt on the optical constants of PVA:NaNO3 composite system. Samples with various NaNO3 dopant contents were prepared by casting technique using distilled water as a solvent. The refractive index (n), extinction coefficient (k), dielectric constants (ɛ r and ɛ i ) and complex optical conductivity (σ*) for the systems have been investigated. Through applying Tauc’s equation and Wemple–DiDomenico (W–D) model, the optical energy gap (E g ) and Urbach tail energies (E u ) were correlated and analyzed. The exponent value (n) in Tauc’s equation has been calculated numerically and it was utilized to understand the nature of electronic transitions. The change in the refractive index from 1.14 for pure PVA to 2.25 for 12 % doped PVA was noticed, indicating the presence of few interactions between photon and electrons. This doping effect has considerably increased the real dielectric constant from 1.30 for pure PVA to 5.10 for 12 % doped PVA. The results showed that dispersion region of refractive index obeyed the W–D model.


NaNO3 Polymer Electrolyte Optical Conductivity Polymer Electrolyte Film Refractive Index Dispersion 
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The authors acknowledge University of Sulaimani for the financial support granted to produce this research work.

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Fahmi Fariq Muhammad
    • 1
    Email author
  • Shujahadeen B. Aziz
    • 2
  • Sarkawt A. Hussein
    • 2
  1. 1.Department of Physics, Faculty of Science and HealthKoya UniversityKoyaKurdistan Regional Government-Iraq
  2. 2.Advanced Materials Research Laboratory, Department of Physics, Faculty of Science and Science EducationUniversity of SulaimaniSulaimani CityKurdistan Regional Government-Iraq

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