Improved dielectric properties of PVDF composites with Ag-deposited NBCTO hybrid particles

In this work, three-phase Ag-NBCTO/PVDF composites were prepared via solution casting and hot pressing techniques, in which Ag-deposited Na 0.5 Bi 0.5 Cu 3 Ti 4 O 12 (NBCTO) hybrid particles were used as fillers and poly(vinylidene fluoride) (PVDF) was used as a polymer matrix. Ag-NBCTO hybrid particles were prepared by chemical precipitation, and Ag particles were discretely grown on the surface of NBCTO. The effects of Ag-NBCTO hybrid particles on the microstructure and dielectric properties of composites were studied in detail. With the increase in the Ag-NBCTO volume fraction, the dielectric constant is improved due to the enhanced interfacial polarization. The dielectric constant of the composite with f Ag-NBCTO = 50 vol% is 139.9 at 1 kHz, nearly 15.9 times higher than that of pristine PVDF, and the dielectric loss remains at a low level of 0.21 at 1 kHz. Meanwhile, the electrical conductivity of all composites is below 2 × 10 −8 S/cm at 100 Hz. The composite exhibits potential applications in electronic devices and electrical systems.