Core-shell structured BaTiO3@Al2O3 nanoparticles in polymer composites for dielectric loss suppression and breakdown strength enhancement
Core-shell structured BaTiO3@Al2O3 nanoparticles in polymer composites for dielectric loss suppression and breakdown strength enhancement
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DOI：
10.1016/j.compositesa.2016.11.025
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发表时间：
2017-02-01
影响因子：
8.7
通讯作者：
Deng, Yuan
中科院分区：
文献类型：
--
作者：
He, Dalong;Wang, Yao;Deng, Yuan
核壳纳米结构的设计是获得先进高k聚合物纳米复合材料的有力方法。通过有效、简便且低成本的异质成核方法制备了具有均匀无定形 Al2O3 壳层封装 BaTiO3 (BT) 颗粒的核壳纳米颗粒。通过改变 BT@Al2O3 纳米粒子的负载量来调节聚偏二氟乙烯 (PVDF) 纳米复合薄膜的介电行为。与裸BT纳米颗粒相比，研究了Al2O3壳和产生的界面对介电和电性能的影响。由于具有适当介电常数的高绝缘Al2O3壳，极性BT纳米颗粒和PVDF之间界面周围的局部电场分布被极大地改变，从而导致明显的介电损耗抑制，同时保持高介电常数。该研究提供了一种获得低损耗和高击穿强度的高 k 介电复合材料的解决方案，这在高功率系统中是非常需要的。 (C) 2016 Elsevier Ltd. 保留所有权利。
Design of core-shell nanoarchitectures is powerful approach to obtain advanced high-k polymer nanocomposites. Core-shell nanoparticles with uniform amorphous Al2O3 shell layer encapsulating BaTiO3 (BT) particles were fabricated through an effective, facile and low-cost heterogeneous nucleation method. The dielectric behaviors of the polyvinylidene fluoride (PVDF) nanocomposite films were adjusted by varying BT@Al2O3 nanoparticles loadings. The effects of Al2O3 shell and the arising interfaces on the dielectric and electric properties in comparison with bare BT nanoparticles were studied. Due to the highly insulating Al2O3 shell with proper dielectric constant, the local electric field distribution around interfaces between polar BT nanoparticles and PVDF were greatly modified leading to obvious dielectric loss suppression yet maintaining high dielectric constant. The study provides a solution for obtaining high-k dielectric composite with low loss and high breakdown strength, which is highly desired in high power systems. (C) 2016 Elsevier Ltd. All rights reserved.