Dramatic effect of multiwalled carbon nanotubes on the electrical properties of alumina based ceramic nanocomposites
Dramatic effect of multiwalled carbon nanotubes on the electrical properties of alumina based ceramic nanocomposites
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DOI：
10.1016/j.compscitech.2009.01.015
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发表时间：
2009-06-01
影响因子：
9.1
通讯作者：
Pan, Wei
中科院分区：
文献类型：
--
作者：
Ahmad, Kaleem;Pan, Wei
报道了多壁碳纳米管（MWNTs）/氧化铝复合材料的电性能研究进展。采用放电等离子烧结法对不同碳纳米管含量的复合材料进行了烧结，并在5 ~ 300 K的温度范围内研究了复合材料的直流电导率随温度的变化。电导率的温度依赖性的分析表明，对于温度高于50 K，导电可以归因于热波动引起的电荷载流子通过绝缘势垒之间的MWNTs的隧穿，而在温度低于50 K，导电可以归因于三维可变范围跳跃通过MWNTs网络中的氧化铝基质。电导率的频率依赖性进行了研究，从5至1.3 × 10（7）Hz。通过主曲线的构建，考察了MWNT/Al_2O_3复合材料中交流导电的普遍性。(C)2009爱思唯尔有限公司保留所有权利。
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.