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This work provided an alternative route to balance the significantly increased dielectric permittivity (ε′) and effectively retained tanδ using an effective two-step concept. Ag-deposited nano-sized BaTiO 3  (Ag- n BT) hybrid particle was used as the first filler to increase the ε′ of the poly(vinylidene-fluoride) (PVDF) polymer via the strong interfacial polarization and a high permittivity of  n BT and suppress the increased loss tangent (tanδ) owing to the discrete growth of Ag nanoparticles on the surface of  n BT, preventing a continuous percolating path. The ε′ and tanδ values at 10 3  Hz of the Ag- n BT/PVDF composite with  f  Ag- n BT ~0.29 were 61.7 and 0.036. The sub-micron-sized BaTiO 3  ( μ BT) particle was selected as the blocking particles to doubly reduce the tanδ with simultaneously enhanced ε′ due to the presence of the tetragonal BT phase. The  μ BT blocking particles can effectively further inhibit the formation of conducting network and hence further reducing tanδ. By incorporation of  μ BT clocking particles with  f μ   BT  = 0.2, the ε′ value of the Ag- n BT/PVDF- μ BT composite ( f  Ag- n BT  = 0.30) can significantly increase to 161.4, while the tanδ was reduced to 0.026. Furthermore, the tanδ was lower than 0.09 in the temperature range of −60–150 °C due to the blocking effect of  μ BT particles.

polymers

Effects of Sub-Micro Sized BaTiO3 Blocking Particles and Ag-Deposited Nano-Sized BaTiO3 Hybrid Particles on Dielectric Properties of Poly(vinylidene-fluoride) Polymer