Dramatic effect of multiwalled carbon nanotubes on the electrical properties of alumina based ceramic nanocomposites

被引：60

作者：

Ahmad, Kaleem ^{[1
]}

Pan, Wei ^{[1
]}

机构：

[1] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Dept Mat Sci & Engn, Beijing 100084, Peoples R China

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2009年 / 69卷 / 7-8期

基金：

中国国家自然科学基金;

关键词：

Carbon nanotubes; Nanocomposites; Electrical properties; Transport properties; RANGE-HOPPING CONDUCTION; AC CONDUCTIVITY; PERCOLATION; TRANSPORT; DC;

D O I：

10.1016/j.compscitech.2009.01.015

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

We report recent work on electrical properties of multiwalled carbon nanotubes (MWNTs)/alumina composites. The composites with different contents of MWNTs were consolidated by spark plasma sintering and their temperature dependence dc conductivity was scrutinized in the temperature range from 5 to 300 K. The analysis of the temperature dependence of the conductivity suggests that for temperatures higher than 50 K, conduction can be ascribed to thermal fluctuation induced tunneling of the charge carriers through insulating barriers between MWNTs, while at temperatures below 50 K, the conduction can be attributed to three dimensional variable range hopping through MWNTs network in the alumina matrix. The frequency dependence of the conductivity was studied from 5 to 1.3 x 10(7) Hz. The universality of the ac conduction in MWNT/alumina composites was examined by construction of master curve. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1016 / 1021

页数：6

共 35 条

[31] Electronic structure of atomically resolved carbon nanotubes [J].