Synthesis and electrical properties of carbon nanotube polyaniline composites
Synthesis and electrical properties of carbon nanotube polyaniline composites
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DOI：
10.1063/1.1786370
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发表时间：
2004-09
影响因子：
4
通讯作者：
Yunze Long;Zhaojia Chen;Xuetong Zhang;Jin Zhang;Zhongfan Liu
中科院分区：
文献类型：
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作者：
Yunze Long;Zhaojia Chen;Xuetong Zhang;Jin Zhang;Zhongfan Liu
以阳离子表面活性剂十六烷基三甲基溴化铵为引发剂，采用原位化学氧化聚合法制备了具有索状结构的多壁碳纳米管/聚苯胺复合材料。有趣的是，随着碳纳米管负载量从0增加到24.8wt%，电导率增加了两个数量级，而依赖于跳跃势垒的Mott特征温度T0降低了三个数量级。此外，低温磁阻也将符号由正变为负。结果表明，碳纳米管与紧密包覆的高分子链之间存在较强的耦合作用，从而提高了复合材料的平均局域长度和电子性能。
A multiwalled carbon nanotube∕polyaniline composite with cablelike morphology has been synthesized by an in situ chemical oxidative polymerization directed with cationic surfactant cetyltrimethylammonium bromide. It is interestingly found that with increasing carbon nanotube loading from 0 to 24.8wt%, the conductivity increases by two orders of magnitude and the Mott’s characteristic temperature T0 which depends on the hopping barrier decreases by three orders of magnitude. Furthermore, the low-temperature magnetoresistance has also changed the sign from positive to negative. The results reveal a strong coupling between the carbon nanotube and the tightly coated polymer chains, which enhances the average localization length and the electronic properties of the composites.