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纳米氧化铁沉积钛酸钡杂化粒子填充聚偏氟乙烯复合材料的介电性能增强。

Enhanced dielectric properties of poly(vinylidene fluoride) composites filled with nano iron oxide-deposited barium titanate hybrid particles.

机构信息

Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, P. R. China.

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, P. R. China.

出版信息

Sci Rep. 2016 Sep 16;6:33508. doi: 10.1038/srep33508.

DOI:10.1038/srep33508
PMID:27633958
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5025841/
Abstract

We report enhancement of the dielectric permittivity of poly(vinylidene fluoride) (PVDF) generated by depositing magnetic iron oxide (Fe3O4) nanoparticles on the surface of barium titanate (BT) to fabricate BT-Fe3O4/PVDF composites. This process introduced an external magnetic field and the influences of external magnetic field on dielectric properties of composites were investigated systematically. The composites subjected to magnetic field treatment for 30 min at 60 °C exhibited the largest dielectric permittivity (385 at 100 Hz) when the BT-Fe3O4 concentration is approximately 33 vol.%. The BT-Fe3O4 suppressed the formation of a conducting path in the composite and induced low dielectric loss (0.3) and low conductivity (4.12 × 10(-9) S/cm) in the composite. Series-parallel model suggested that the enhanced dielectric permittivity of BT-Fe3O4/PVDF composites should arise from the ultrahigh permittivity of BT-Fe3O4 hybrid particles. However, the experimental results of the BT-Fe3O4/PVDF composites treated by magnetic field agree with percolation theory, which indicates that the enhanced dielectric properties of the BT-Fe3O4/PVDF composites originate from the interfacial polarization induced by the external magnetic field. This work provides a simple and effective way for preparing nanocomposites with enhanced dielectric properties for use in the electronics industry.

摘要

我们报告了通过在钛酸钡 (BT) 表面沉积磁性氧化铁 (Fe3O4) 纳米粒子来增强聚偏二氟乙烯 (PVDF) 的介电常数，从而制备 BT-Fe3O4/PVDF 复合材料。该过程引入了外磁场，并系统研究了外磁场对复合材料介电性能的影响。当 BT-Fe3O4 浓度约为 33vol.%时，在 60°C 下经磁场处理 30 分钟的复合材料表现出最大的介电常数 (100Hz 时为 385)。BT-Fe3O4 抑制了复合材料中导电路径的形成，并导致复合材料具有低介电损耗 (0.3) 和低电导率 (4.12×10(-9) S/cm)。串联-并联模型表明，BT-Fe3O4/PVDF 复合材料的增强介电常数应源于 BT-Fe3O4 混合粒子的超高介电常数。然而，经磁场处理的 BT-Fe3O4/PVDF 复合材料的实验结果符合渗流理论，这表明 BT-Fe3O4/PVDF 复合材料增强的介电性能源于外磁场诱导的界面极化。这项工作为制备用于电子工业的具有增强介电性能的纳米复合材料提供了一种简单有效的方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/43380f331488/srep33508-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/9b10318304d0/srep33508-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/cef0651a8dd4/srep33508-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/3c7020291ac1/srep33508-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/43380f331488/srep33508-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/9b10318304d0/srep33508-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/19aad5ad7dea/srep33508-f2.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/d6162bca5267/srep33508-f4.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/cef0651a8dd4/srep33508-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/3c7020291ac1/srep33508-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/672b/5025841/43380f331488/srep33508-f8.jpg

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