Core–Shell Engineering of Conductive Fillers toward Enhanced Dielectric Properties: A Universal Polarization Mechanism in Polymer Conductor Composites

材料科学 电介质 复合材料 复合数 极化(电化学) 聚合物 导电体 导线 介电损耗 光电子学 物理化学 化学
作者
Wenying Zhou,Guozheng Cao,Mengxue Yuan,Shao‐Long Zhong,Yandong Wang,Xiangrong Liu,Dan Cao,Wenqin Peng,Jing Liu,Guangheng Wang,Zhi‐Min Dang,Bo Li
出处
期刊:Advanced Materials [Wiley]
卷期号:35 (2) 被引量:145
标识
DOI:10.1002/adma.202207829
摘要

Flexible dielectric and electronic materials with high dielectric constant (k) and low loss are constantly pursued. Encapsulation of conductive fillers with insulating shells represents a promising approach, and has attracted substantial research efforts. However, progress is greatly impeded due to the lack of a fundamental understanding of the polarization mechanism. In this work, a series of core-shell polymer composites is studied, and the correlation between macroscopic dielectric properties (across entire composites) and microscopic polarization (around single fillers) is investigated. It is revealed that the polarization in polymer conductor composites is determined by electron transport across multiple neighboring conductive fillers-a domain-type polarization. The formation of a core-shell filler structure affects the dielectric properties of tpolymer composites by essentially modifying the filler-cluster size. Based on this understanding, a novel percolative composite is prepared with higher-than-normal filler concentration and optimized shell's electrical resistivity. The developed composite shows both high-k due to enlarged cluster size and low loss due to restrained charge transport simultaneously, which cannot be achieved in traditional percolative composites or via simple core-shell filler design. The revealed polarization mechanism and the optimization strategy for core-shell fillers provide critical guidance and a new paradigm, for developing advanced polymer dielectrics with promising property sets.
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