Abstract
Sodium ion conducting polymer blend electrolyte films, based on polyethylene oxide (PEO) and poly vinyl pyrrolidone (PVP) complexed with NaCl salt, were prepared using solution casting technique. The complexation of the salt with the polymer blend was confirmed by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR) and UV‐vis spectroscopy. Frequency and temperature dependence of electrical conductivity of the films was studied with impedance analyzer in the frequency range of 1 Hz to 1 MHz and in the temperature range of 303–348 K. UV‐vis absorption spectra in wavelength region 200–800 nm, were used to evaluate the optical properties like direct and indirect optical energy band gaps, optical absorption edge. The optical band gaps decreased with the increase of Na+ ion concentration. This suggests that NaCl, as dopant, is a good choice to improve the electrical and optical properties of PEO/PVP polymer blend electrolytes.
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