As the electronic industry developed rapidly, greater demands are required on the performance of dielectric composites, such as high permittivity, low dielectric loss, and high-energy density. Improving the compatibility of fillers in polymer matrix and uniform distribution of the electric field could increase the permittivity of such composites. Therefore, BaTiO nanoparticles were coated by TiO sol to fabricate BaTiO @TiO core-shell structured fillers in this paper. BaTiO @TiO fillers with gradient 2 3 2 3 2 permittivity were firstly modified by dopamine in order to disperse in the composites homogeneously and adhere to poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix tightly. At 1 kHz, the permittivity of the composite with 20 vol% BaTiO @TiO was 32.15, obviously larger than that of pure P(VDF-HFP) (6.92), and the dielectric loss was just 3 2 0.052. Consequently, the discharged energy density of the composite was enhanced to 0.23 J/cm at 40 kV/mm, which was two times higher than that of pure P(VDF-HFP). This work provides a feasible approach to prepare high-performance dielectric composites. . . . . Keywords Dielectric BaTiO @TiO Discharged energy density Core-shell structure P(VDF-HFP) 3 2 Introduction density material compared to other capacitors materials such as ceramic thin films and conventional ceramics,
Ionics – Springer Journals
Published: May 29, 2018
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