STUDIES ON OPTICAL PROPERTIES OF PVA BASED COMPLEX POLYMER ELECTROLYTE
M. Gnana Kiran, N. Krishna Jyothi, K. Samatha, M. Prabhakar Rao, V. B. V. N. Prasad
Abstract
Solid Polymer Electrolytes (SPE) based on polymer (PVA) Polyvinyl Alcohol is doped with Sodium Nitrate (NaNO3), a membrane is prepared by solution casting method. Here outcomes of the optical transmission, optical absorption, optical absorption coefficient, optical refractive index, optical extinction coefficient, direct energy band gaps, indirect energy bandgap, absorption edge, estimated band gap, optical conductance studies are given. Optical properties are taken by UV-visible (Ultraviolet-visible) Absorption spectroscopy wavelength within the range of 200 nm to 800 nm. optical transmittance wavelength is 200 nm. Energy band gap changes from 5.6eV to 4.9eV. Indirect, direct and absorption edge is high for polymer pure PVA. By increasing the salt concentration to the polymer the abovementioned parameters are decreasing gradually. For the concentration of 70% PVA: 30% NaNO3 has a low value of direct and indirect energy bandgap.