In the current study graphene oxide (GO) as a novel approach was examined to reduce the optical bandgap of polyvinyl alcohol (PVA). The synthesis of PVA/GO nanocomposite films with varying GO concentrations was conducted using solution cast procedure. The PVA/GO composites were studied by XRD, FTIR and SEM to understand the structural and morphological appearance. A comprehensive optical characterization was performed using UV–Vis spectroscopy. Dispersion parameters were analyzed using the Wemple and DiDomenico (WDD) model, which showed that GO material had a major impact on the films' optical performance. The observed significant variations in the dispersion energy (), the high-frequency dielectric constant (), and the single-effective oscillator energy () are of great interest. Drude's theory was also used to investigate the dielectric characteristics; the results showed variations in the free carrier concentration and lattice dielectric constants (). The investigation also focused on nonlinear optical properties, emphasizing improvements in nonlinear susceptibilities ( and ) and nonlinear refractive indices () at higher concentrations of GO. The findings demonstrate that GO doping efficiently tailors the optical and dielectric properties of PVA-based materials, making them suitable for a variety of optoelectronic applications.
