​Hybrid thin films of doped polyaniline (PANI) with Zinc Oxide (ZnO) nanoparticles (NPs) embedded in bimodal mesoporous silica-forming (ZnO@SiO_x) NPs were prepared. The preparation was done by spin coating techniques of the solution of a protonated PANI with TFA acid with sequential weight ratios of ZnO@SiO_x NPs in the range from 15% to 60%. The prepared thin film morphologies were investigated using Scanning Electron Microscopy (SEM). The aggregation or the clustering of ZnO@SiO_x) NPs in the polymer network matrix is very limited due to the silicone oxide (SiO_x) which is known to limit the growth of aggregation clusters. The optical properties of hybrid thin films were studied through reflectance and transmission spectroscopy in the UV–Vis range. The optical constants such as the refractive index (n), extinction coefficient (k), real (ɛ') and imaginary (ɛ'') parts of dielectric permittivity and the …​​