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      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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          Most cited references 46

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

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            Interfaces are the dominant feature of dielectrics at the nanometric level

             T.J. Lewis (2004)
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              Materials Challenges Facing Electrical Energy Storage

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                Author and article information

                Journal
                JMCCCX
                Journal of Materials Chemistry C
                J. Mater. Chem. C
                Royal Society of Chemistry (RSC)
                2050-7526
                2050-7534
                2018
                2018
                : 6
                : 2
                : 271-279
                Affiliations
                [1 ]School of Electronic and Information Engineering, Foshan University
                [2 ]Foshan
                [3 ]China
                [4 ]School of Physics and Electronic Engineering, Guangzhou University
                [5 ]Guangzhou
                [6 ]School of Materials Science & Engineering, Tongji University
                [7 ]Shanghai 201804
                Article
                10.1039/C7TC04758D
                © 2018
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=C7TC04758D

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