High dielectric permittivity and low percolation threshold in polymer composites based on SiC-carbon nanotubes micro/nano hybrid
High dielectric permittivity and low percolation threshold in polymer composites based on SiC-carbon nanotubes micro/nano hybrid
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DOI：
10.1063/1.3544942
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发表时间：
2011-01
影响因子：
4
通讯作者：
Jinkai Yuan;Weilong Li;S. Yao;Youqin Lin;A. Sylvestre;J. Bai
中科院分区：
文献类型：
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作者：
Jinkai Yuan;Weilong Li;S. Yao;Youqin Lin;A. Sylvestre;J. Bai
在 SiC 微板上合成垂直排列的碳纳米管 (CNT)。将所得的 SiC-CNT 杂化物进一步掺入聚偏二氟乙烯 (PVDF) 作为导电填料，以制备渗流复合材料。它们表现出低得多的渗滤阈值（1.47 vol%），但介电常数显着增强。在 100 Hz 下，碳纳米管含量为 2.3 vol% 的 SiC-CNT/PVDF 复合材料中观察到的最大介电常数为 8700。基于混合 SiC-CNT 填料的特殊几何形状，提出了微电容器模型来解释所获得的结果。
Vertically aligned carbon nanotubes (CNTs) were synthesized on SiC microplates. Resultant SiC-CNTs hybrids were further incorporated into poly(vinylidene fluoride) (PVDF) as conductive filler to prepare percolative composites. They exhibited a much low percolation threshold (1.47 vol %), but the dielectric permittivity was enhanced significantly. The largest dielectric permittivity of 8700 was observed in the SiC-CNTs/PVDF composites with 2.3 vol % CNTs at 100 Hz. A microcapacitor model was proposed to explain the obtained results based on the special geometry of the hybrid SiC-CNTs filler.