Amorphous TiO2-coated reduced graphene oxide hybrid nanostructures for polymer composites with low dielectric loss

Abstract Nanocomposite of poly(vinylidene fluoride-co-hexafluoropropylene) incorporated with titanium dioxide-modified reduced graphene oxide sheets (rGO–TiO 2 /PVDF-HFP) was prepared by in situ assembling TiO 2 on graphene oxide (GO), and its dielectric properties were carefully characterized. The GO layers were completely coated with amorphous TiO 2 . The dielectric permittivity increased stably as rGO–TiO 2 content increased, and the loss was low at low frequencies. TiO 2 inter-layer acted as an inter-particle barrier to prevent direct contact of rGO, which provided a new simple way for tuning the dielectric properties of polymer composites with low dielectric loss by controlling the structure of fillers.