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Surfactant‐Directed Polypyrrole/CNT Nanocables: Synthesis, Characterization, and Enhanced Electrical Properties
Author(s) -
Zhang Xuetong,
Zhang Jin,
Wang Rongming,
Zhu Tao,
Liu Zhongfan
Publication year - 2004
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200301217
Subject(s) - polypyrrole , carbon nanotube , polymerization , sodium dodecylbenzenesulfonate , materials science , chemical engineering , ammonium persulfate , pulmonary surfactant , ammonium bromide , bromide , polyethylene glycol , molecule , polymer chemistry , chemistry , inorganic chemistry , nanotechnology , organic chemistry , polymer , engineering , composite material
We describe here a new approach to the synthesis of size‐controllable polypyrrole/carbon nanotube (CNT) nanocables by in situ chemical oxidative polymerization directed by the cationic surfactant cetyltrimethylammonium bromide (CTAB) or the nonionic surfactant polyethylene glycol mono‐ p ‐nonylphenyl ether (O π –10). When carbon nanotubes are dispersed in a solution containing a certain concentration of CTAB or O π –10, the surfactant molecules are adsorbed and arranged regularly on the CNT surfaces. On addition of pyrrole, some of the monomer is adsorbed at the surface of CNTs and/or wedged between the arranged CTAB or O π –10 molecules. When ammonium persulfate (APS) is added, pyrrole is polymerized in situ at the surfaces of the CNTs (core layer) and ultimately forms the outer shell of the nanocables. Such polypyrrole/CNT nanocables show enhanced electrical properties; a negative temperature coefficient of resistance at 77–300 K and a negative magnetoresistance at 10–200 K were observed.