Electrical conductivity and microwave absorption of shortened multi-walled carbon nanotube/alumina ceramic composites

被引：65
作者：
Bi, Song [1 ]
Su, Xunjia [1 ]
Hou, Genliang [1 ]
Liu, Chaohui [1 ]
Song, Wei-Li [2 ,3 ]
Cao, Mao-Sheng [3 ]
机构：
[1] Xian High Technol Inst, Dept 501, Xian 710025, Shaanxi, Peoples R China
[2] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
[3] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2013年 / 39卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Shortened carbon nanotube; Ceramic composite; Percolation threshold; Microwave absorption; ALUMINA; BEHAVIOR; MATRIX;
D O I：
10.1016/j.ceramint.2012.12.057
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Multi-walled carbon nanotubes (MWCNTs) snipped by the acidification process were fabricated into alumina (Al2O3) matrices via hydrothermal crystallization and hot-pressing techniques for achieving MWCNT/Al2O3 composites. The electrical conductivity and complex permittivity of the as-fabricated composites were investigated in the range of 8.2-12.4 GHz, and the corresponding microwave reflection loss was evaluated. Compared to the pristine MWCNT/Al2O3 composites, the percolation threshold of electrical conductivity was observed to increase from the range of 0.094-2.5 wt% to 3.89 wt%, mainly owing to the decrease of MWCNT aggregations based on the shortened tubes. The resulting shortened MWCNTs/Al2O3 were found to demonstrate strong microwave absorption in the investigated region. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：5979 / 5983
页数：5
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