Highly transparent tin oxide thin films (SnO2) have been prepared using the sol–gel spin coating technique, optimising process parameters such as the solute concentration, spin rate and time of the turn table, film thickness (number of coatings) and heat treatment temperature. The X-ray diffraction (XRD) studies point to the polycrystalline structure of the developed films. The films deposited under optimum conditions are highly transparent in the visible region with a transmittance of 94% at 550 nm and have a resistivity of 3 × 10−2 Ωcm. The films have been obtained at a relatively low process temperature of 400°C.

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Polymer electrolytes with poly(vinyl chloride) (PVC) and poly(vinylidene fluoride)(PVdF) blend as matrix and lithium perchlorate (LiClO4) as dopant salt were prepared by solvent casting technique. Propylene carbonate was used as plasticizer and tetrahydrofuran (THF) as common solvent. Zinc oxide nano particles were synthesized through novel solid-state milling method and incorporated as filler. The content (wt%) of nano filler in the polymer electrolyte was systematically varied to study its influence on the conductivity of the electrolyte membranes. The films were subjected to complex impedance analysis in the frequency range 50 – 100 KHz. The analysis reveals the strong influence of filler particles on the conductivity profile of the electrolytes.

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