Optical Analysis and UV-Blocking Filter of Cadmium Iodide-Doped Polyvinyl Alcohol Polymeric Composite Films: Synthesis and Dielectric Properties

Abstract: Polymer electrolyte films containing polyvinyl alcohol (PVA) with various CdI₂ inorganic salt contents are prepared using an ultrasonic wave and a casting method for studying the effect of cadmium iodide (CdI₂) additions on the microstructure, optic and dielectric characteristics of the PVA film. Incorporating CdI₂ inorganic salt affects the microstructural parameters of the proposed films. UV–Vis–NIR optical spectroscopy explores the influence of the inorganic CdI₂ salt content on the optical characteristics. For 3.7 wt% CdI₂ inorganic salt sample, each of the materials is a possible candidate for UV-shielding applications, the prepared polymeric electrolyte films begin a blocking light between 190 and 276 nm of UV–Vis light. The gap energy in the visible region attributes to a reduction in the size of the crystallite, with increasing CdI₂ concentrations. The band gaps enhance the behavior of light absorption and the materials examined were suited for optical UV protection systems. The ionic conductivity of the polymer electrolyte films is studied as a function of the added CdI₂ inorganic salt. The AC impedance in PVA polymeric electrolyte film behaviors also depends on the incorporation of CdI₂ inorganic salt which improves their dielectric parameters. CdI₂/PVA composite films showed a new trend in the electrical and optical behavior for many applications especially UVC light blocking. Graphic Abstract: [Figure not available: see fulltext.]