Improvement of Dielectric Performance and Temperature-Dependent Behavior of Polyvinylidene Fluoride Composite with KTa_0.5Nb_0.5O₃@Ag Nanoparticles

Abstract

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 (E A ) 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.

Optimizing Ply Pattern and Composition of Layered Composites based on Cyanate Ester, Carbon Nanotube, and Boron Nitride: Toward Ultralow Dielectric Loss and High Energy Storage

“…As a passive component, dielectric capacitors are not only environment-friendly, but also possess intrinsic high power density due to their ultrafast charge–discharge capability . Therefore, they have wide applications in hybrid electric vehicles, medical devices, and electrical weapon systems. − In recent years, the great demand on miniaturization and package application asks for increasing requirement on capacitors with high energy storage. However, the energy density of dielectric capacitors is greatly limited by the low dielectric constant of available dielectric materials …”

Oxygen Vacancy-Controlled Dielectric Relaxation and Field-Driven Polarization of Bismuth–Manganese Bimetallic Oxide Nanoparticles: Implications for Capacitors

“…Therefore, we believe that the electron hopping via the bridges with relatively smaller activation energy (0.12 eV) dominates in the high-frequency relaxation. Similar behavior has also been reported in other nanoparticle-based organic–inorganic hybrid systems, where interfacial effects control the relaxation phenomena. , With increasing temperature, the mobility of the charge carrier species increased and the dielectric relaxation time decreased. Merging and shifting of peaks with increasing temperature are thermally activated processes, where the charge carriers generated from oxygen vacancies collectively play an important role in the localized hopping conduction inside the nanocrystal.…”

Structure‐Dependent Electrical and Magnetic Properties of Iron Oxide Composites

“…There is a strong indication that the electrode polarization had a negligible contribution to M ′ as it approached zero. This behavior can be explained by feeble or no force governing the polarization of charge carriers under the influence of a lower electric field . In plots of the imaginary part of modulous, M ″, clear peaks are observed.…”