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An ultra high dielectric constant nanocomposites comprising of poly(vinylidene fluoride) (PVDF) as a polymer matrix and niobium pentoxide (Nb₂O₅)-reinforced graphene oxide (GO) have been successfully developed using solution casting technique. Scanning electron microscopy (SEM) demonstrates that the homogeneous dispersion of Nb₂O₅ and GO within the PVDF matrix was realized. The dielectric and electrical properties of the resulting PVDF-GO-Nb₂O₅ nanocomposite films as a function of frequency were studied. The dielectric constant of the nanocomposites system reached a value of about ≈140 at 100 Hz, with a relatively low dielectric loss factor (≈ 1.4). The enhanced dielectric performance of the PVDF-GO-Nb₂O₅ nanocomposites was ascribed to the presence of Nb₂O₅ onto the GO, which exhibits strong interaction between GO and PVDF matrix through hydrogen bonding. Moreover, the …