Improvement of Dielectric Performance and Temperature-Dependent Behavior of Polyvinylidene Fluoride Composite with KTa0.5Nb0.5O3@Ag Nanoparticles

The effects of KTN and KTN@Ag nanoparticles on dielectric behavior and temperature-dependent dielectric mechanisms of PVDF-based composites were studied. It was found that relatively high dielectric permittivity, low loss tangent, and outstanding dielectric stability were simultaneously achieved in the Nano-KTN@Ag/PVDF hybrid films. In this study, we found that the effect of interfacial polarization on the permittivity of Nano-KTN@Ag/PVDF hybrid film becomes more and more significant with the increase of temperature. The calculated conductivity activation energy (EA) proved that the migration of charge carriers requires more energy to overcome the potential barrier in the Nano-KTN@Ag/PVDF hybrid films than that in the Nano-KTN/PVDF hybrid films. A complete and systematic study of the dielectric mechanism is necessary, which can be a significant guide to the preparation of dielectric materials applied in the electronics industry.