Abstract
The poly(vinylidene fluoride) (PVDF) based composites with a novel hybrid BaTiO3-graphene nanoplatelets (BTG) as filler were fabricated and their dielectric properties were investigated. The hybrid BTG filler was prepared by a sol-gel process and then sintered at 800°C. Scanning electron microscopy images revealed that BaTiO3 nanoparticles with the average diameter in the range of 15 to 20 nm were immobilized on the surface of graphene nanoplatelets. X-ray diffractions indicated that the BaTiO3 nanoparticles were in cubic crystalline. The BTG filled PVDF composites were prepared by solution casting and followed by hot-pressing. These composites showed high ɛr at 100 kHz, e. g., 300 for BTG-1/PVDF, 75 for BTG-2/PVDF and 50 for BTG-3/PVDF. Accordingly, the dielectric loss was 1.1 for BTG-1/PVDF, 1.6 for BTG-2/PVDF, and 0.5 for BTG-3/PVDF at 100 kHz. The percolation value increased with the increasing of BaTiO3 nanoparticles. In detail, fBTG-1/PVDF was 3 wt%, fBTG-2/PVDF was 4 wt% and fBTG-3/PVDF was 5 wt% respectively.
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