Electrical conductivity of chemically modified multiwalled carbon nanotube/epoxy composites

被引：551

作者：

Kim, YJ

Shin, TS

Choi, HD

Kwon, JH

Chung, YC

Yoon, HG

机构：

[1] Korea Univ, Div Mat Sci & Engn, Seoul 136701, South Korea

[2] Elect & Telecommun Res Inst, Electromagnet Environm Res Team, Taejon 305350, South Korea

[3] Seokyeong Unib, Dept Informat & Commun Engn, Seoul 136704, South Korea

来源：

CARBON | 2005年 / 43卷 / 01期

关键词：

carbon nanotubes; oxidation; electrical properties;

D O I：

10.1016/j.carbon.2004.08.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrical conductivity of oxidized multiwalled carbon nanotubes (MWNT)/epoxy composites is investigated with respect to the chemical treatment of the MWNT. The oxidation is carried out by refluxing the as-received MWNT in concentrated HNO3 and H2O2/NH4OH solutions, respectively, under several different treatment conditions. The oxidized MWNT are negatively charged and functionalized with carboxylic groups by both solutions. The MWNT oxidized under severe conditions are well purified, but their crystalline structures are partially damaged. It is recognized that the damage to the MWNT has considerable influence on the electrical properties of the MWNT composites, causing the electrical conductivity to be lowered at a low content of MWNT and the percolation threshold to be raised. The MWNT oxidized by the mixture of H2O2 and NH4OH solution provides epoxy composites with a higher conductivity than those produced with the MWNT oxidized by nitric acid over the whole range of MWNT, independently of the oxidation conditions. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：23 / 30

页数：8

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