High dielectric constant and low dielectric loss poly(vinylidene fluoride) nanocomposites via a small loading of two-dimensional Bi2Te3@Al2O3 hexagonal nanoplates

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Abstract

Nanocomposite films with a small loading of two-dimensional Bi ₂Te ₃@Al ₂O ₃ hexagonal nanoplates exhibit a high dielectric constant of 140 and relatively low dielectric loss of 0.05 at 1 kHz.

Abstract

Two-dimensional (2D) core–shell structure Bi ₂Te ₃@Al ₂O ₃ nanoplates were synthesized from 2D Bi ₂Te ₃ nanoplates via a sol–gel method, where the 2D Bi ₂Te ₃ nanoplates were prepared via a microwave-assisted method. Homogeneous nanocomposite films, with poly(vinylidene fluoride) (PVDF) as the polymeric matrix and Bi ₂Te ₃ nanoplates or core–shell structured Bi ₂Te ₃@Al ₂O ₃ nanoplates as the fillers, have been prepared. The dielectric behavior of the Bi ₂Te ₃/PVDF and Bi ₂Te ₃@Al ₂O ₃/PVDF nanocomposites has been investigated. Compared with the Bi ₂Te ₃/PVDF nanocomposite, the Bi ₂Te ₃@Al ₂O ₃/PVDF composite film exhibits larger breakdown strength and lower dielectric loss, due to the highly insulating Al ₂O ₃ shell layer, as well as the Al ₂O ₃ dielectric constant being incorporated into the Bi ₂Te ₃ nanoplate surface. As a result, the composite film loaded with 10 vol% 2D Bi ₂Te ₃@Al ₂O ₃ nanoplates exhibits a high dielectric constant of 140 and a relatively low dielectric loss of 0.05 at 1 kHz. Furthermore, finite element simulations were carried out to understand the dielectric mechanism of Al ₂O ₃ shell layer effects on the dielectric performances of the nanocomposite films. This study provides a solution for obtaining high- k dielectric composites with low dielectric loss, which is highly desired for power systems and advanced electronics.

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Electroactive phases of poly(vinylidene fluoride): Determination, processing and applications

P. Martins, S Lanceros-Méndez, A.C. Lopes (2014)

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Solution-processed ferroelectric terpolymer nanocomposites with high breakdown strength and energy density utilizing boron nitride nanosheets

Chuanxi Xiong, Feihua Liu, Guangzu Zhang … (2015)

Ferroelectric polymer nanocomposites with boron nitride nanosheets exhibit greatly improved energy densities and higher charge–discharge efficiencies. The development of high-performance capacitive energy storage devices is of critical importance to address an ever-increasing electricity need. The energy density of a film capacitor is determined by the dielectric constant and breakdown strength of dielectric materials. With the highest dielectric constant among the known polymers, poly(vinylidene fluoride)-based ferroelectric terpolymers are of great potential for high energy density capacitors. However, their energy storage capability has long been limited by the relatively low breakdown strength. Here we demonstrate remarkable improvements in the energy density and charge–discharge efficiency of the ferroelectric terpolymers upon the incorporation of ultra-thin boron nitride nanosheets (BNNSs). It is found that BNNSs function as a robust scaffold to hamper the onset of electromechanical failure and simultaneously as an efficient insulating barrier against electrical conduction in the resulting polymer nanocomposites, resulting in greatly enhanced breakdown strength. Of particular note is the improved thermal conductivity of the terpolymer with the introduction of BNNSs; this is anticipated to benefit the stability and lifetime of polymer capacitors. This work establishes a facile, yet efficient approach to solution-processable dielectric materials with performance comparable or even superior to those achieved in the traditionally melt-extruded ultra-thin films.