Simple synthesis and characterization of novel polyvinyl alcohol capped sodium selenite solid composite film (PVA: NaSe SCF) samples

Microstructural, optical, AC dielectric impedance, and conductivity properties of pure PVA and PVA: NaSe SCF samples doped with various NaSe salt fillers were investigated. The XRD study confirmed the semi-crystalline structure of the PolVA:NaSe SCF samples which explicated the semi-crystalline nature of the pure PolVA as a matrix. This is related to a strong intermolecular contact among PolVA chains over intermolecular hydrogen connections. As NaSe salt fillers in the PolVA matrix increased, bandgap energies decreased. The Urbach energy was also changed with the variation of Mo concentration. The AC dielectric properties were enhanced with the introduction of NaSe salt fillers. As the NaSe salt fillers increase, the DC electrical conductivity parameters decrease. The AC impedance parameters infer that the prepared sample is a potential dielectric candidate. The studied material can be used in electronic and optoelectronic applications, especially CUT-OFF laser filters.