Large dielectric constant of the chemically functionalized carbon nanotube/polymer composites

被引：226

作者：

Li, Qun ^{[1
]}

Xue, Qingzhong ^{[1
]}

Hao, Lanzhong ^{[1
]}

Gao, Xili ^{[1
]}

Zheng, Qingbin ^{[1
]}

机构：

[1] China Univ Petr, Coll Phys Sci & Technol, Shandong 257061, Peoples R China

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2008年 / 68卷 / 10-11期

关键词：

carbon nanotubes; polymers; functional composites; electrical properties;

D O I：

10.1016/j.compscitech.2008.04.019

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

Pristine, carboxylic and ester functionalized multi-walled carbon nanotube (MWCNT)/poly(vinylidene fluoride) (PVDF) composites were fabricated by evaporating suspensions of the nanotubes in PVDF Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) showed that carboxylic groups and ester groups had been introduced on the surface of MWCNTs. The Raman spectroscopy showed that the amorphous carbon materials and impurities had decreased by chemical functionalizations. The electrical conductivity and dielectric properties of the composites were investigated. The percolation thresholds of the pristine, carboxylic and ester functionalized MWCNT/PVDF composites are approximately equal, about 3.8 vol%, but the dielectric constants are enhanced significantly. The largest dielectric constant of 3600 is obtained in the carboxylic functionalized MWCNT/PVDF composite with 8 vol% MWCNT at 1 kHz, which can be attributed to the preparation procedure and the interface effect between the MWCNTs and the polymer. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2290 / 2296

页数：7

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