<p>Polymer nanocomposites with enhanced optical and electrical properties are highly sought after for various technological applications, including optoelectronic devices, energy storage systems, and sensors. This study focuses on the development and characterization of PMMA/PVDF nanocomposites incorporating LiCl/ZnO nanofillers, aiming to improve their optical and electrical properties. These nanocomposites were synthesized using a solution casting method, where varying concentrations of LiCl/ZnO nanoparticles were dispersed within a PMMA/PVDF blend. XRD analysis was employed to examine the crystalline structure of the nanocomposites, revealing a reduction in crystallinity with increasing LiCl/ZnO concentration. This suggests that the nanoparticles disrupt the polymer chain packing, leading to a more amorphous structure. FTIR spectroscopy confirmed the presence of both PMMA and PVDF in the nanocomposites and provided insights into the interactions between the polymers and the nanoparticles. In addition, UV–Vis–NIR spectrophotometry was used to study the optical properties of the nanocomposites, and the results showed a decrease in the optical band gap with increasing nanofiller concentration. This indicates that the nanocomposites can absorb light more efficiently, making them potentially suitable for solar energy harvesting applications. Electrical measurements were conducted to evaluate the conductivity and dielectric properties of the nanocomposites. The experimental results suggest that PMMA/PVDF-LiCl/ZnO nanocomposites have the potential to be used in a wide range of advanced technologies. Their properties make them suitable for optoelectronic applications such as optical coatings and bandgap tuners, as well as energy storage solutions like thin-film capacitors and solid polymer electrolytes. Furthermore, they could be used in electronic devices as conductivity regulators and high-permittivity tunable nanodielectrics.</p> Graphical abstract <p>Preparation of polymer nanocomposite films.</p> <p></p>