Optical Properties of PVA:CdCl2.H2O Polymer Electrolytes

Abstract

Polymer electrolytes based on Polyvinyl alcohol - Cadmium Chloride were prepared by solution cast technique. Results of optical absorption, transmission spectra, refractive index, optical band gaps, optical conductance, single oscillator energy, dispersion energy, real and imaginary parts of dielectric constants studies are presented. The optical properties were obtained using UV-VIS Double Beam Spectrophotometer in the wavelength range (190-1100) nm. The optical transmittance at wavelength ≈ 190nm for pure PVA was nearly at 78%, while it was 50% for all doped samples. The optical transmittance was increased with increasing wavelength up to 98% for all films beyond ≈240nm. The calculated energy band gap changes from 6.42eV (pure PVA) to 5.80eV (PVA-20%CdCl2.H2O). The optical conductance and band-gap indicated that the films are almost transmitting within the visible range. The single oscillator expression has been used to obtain the information about disorder degree. The real and imaginary parts of dielectric constant of the doped films increases with increasing CdCl2.H2O concentration, and it shows decreases abruptly in the wavelength (200- 220) nm, and finally becomes constant with increase in photon energy.