High dielectric properties in a three-phase polymer composite induced by a parallel structure
High dielectric properties in a three-phase polymer composite induced by a parallel structure
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平行结构引起的三相聚合物复合材料的高介电性能
DOI：
10.1016/j.matchemphys.2013.02.045
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发表时间：
2013-05-15
影响因子：
4.6
通讯作者：
Bai, Jinbo
中科院分区：
文献类型：
--
作者：
Li, Mao;Deng, Yuan;Bai, Jinbo
采用简单而稳健的球磨和热压工艺制备了一种新型三相复合材料，该复合材料由半导体硫化铋(Bi2S3)纳米棒和镶嵌在聚偏氟乙烯(PVDF)中的自钝化铝片(AFS)(1)组成。研究了添加AFS前后复合材料的介电性能随Bi2S3体积分数和频率的变化规律。聚偏氟乙烯中的Bi2S3纳米棒形成了渗流通道，显著提高了复合材料的介电常数。加入第三相AFS后，在热压过程中形成平行结构。在PVDF中并联AFS可以大大降低AFS外的自钝化绝缘壳造成的泄漏电流，从而显著降低三相Bi2S3AFS/PVDF复合材料的介电损耗。同时，形成了许多以铝片为电极、Bi2S3/PVDF复合材料为介电层的微电容器，为三相复合材料的高介电常数提供了额外的贡献。(C)2013爱思唯尔B.V.保留所有权利。
A novel three-phase composite, consisting of semiconductive bismuth sulfide (Bi2S3) nanorods and self-passivated aluminum flakes (AFs)(1) embedded in a poly(vinylidene fluoride) (PVDF) matrix, was fabricated by simple but robust ball-milling and hot-pressing techniques. The dielectric properties of composites were studied before and after the addition of AFs as a function of Bi2S3 volume fraction and frequency. The Bi2S3 nanorods in PVDF matrix form a percolation path and increase the dielectric constant of the composite dramatically. And after adding the third phase AFs, a parallel structure forms during the hot-pressing progress. Parallel AFs in the PVDF matrix can largely reduce the leakage current due to the self-passivated insulating shell outside the AFs, thus an obvious reduction in the dielectric loss of the three-phase Bi2S3 AFs/PVDF composite is observed. Meanwhile, many microcapacitors formed with Al flakes as electrodes and Bi2S3/PVDF composite as the dielectric layer form, which makes an additional contribution to the high dielectric constant of the three-phase composite. (C) 2013 Elsevier B.V. All rights reserved.