Synthesis and electrical properties of carbon nanotube polyaniline composites

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 24.8 w...

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Bibliographic Details
Published in:Applied physics letters 2004-09, Vol.85 (10), p.1796-1798
Main Authors: Long, Yunze, Chen, Zhaojia, Zhang, Xuetong, Zhang, Jin, Liu, Zhongfan
Format: Article
Language:English
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Summary: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 24.8 wt % , the conductivity increases by two orders of magnitude and the Mott's characteristic temperature T 0 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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1786370