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Formation Mechanism of Conducting Polypyrrole Nanotubes in Reverse Micelle Systems

Cited 144 time in Web of Science Cited 141 time in Scopus
Authors
Jang, Jyongsik; Yoon, Hyunseok
Issue Date
2005-10-19
Publisher
American Chemical Society
Citation
Langmuir 2005, 21, 11484-11489
Abstract
Polypyrrole (PPy) nanotubes were readily fabricated through chemical oxidation polymerization in sodium
bis(2-ethylhexyl) sulfosuccinate (AOT) reverse (water-in-oil) emulsions. The reverse cylindrical micelle
phase was characterized, and the key factors affecting the formation of PPy nanotubes were systematically
inspected.AOTreverse cylindrical micelles were prepared via a cooperative interaction between an aqueous
FeCl3 solution and AOT in an apolar solvent. In the H2O/FeCl3/AOT/apolar solvent system, the aqueous
FeCl3 solution played a role in increasing the ionic strength and decreasing the second critical micelle
concentration of AOT. As a result, AOT reverse cylindrical micelles could be spontaneously formed in an
apolar solvent. In addition, iron cations were adsorbed to the anionic AOT headgroups that were capable
of extracting metal cations from the aqueous core. Under these conditions, the addition of pyrrole monomer
resulted in the chemical oxidation polymerization of the corresponding monomer at the surface of AOT
reverse cylindrical micelles, followed by the formation of tubularPPynanostructures. In a typical composition
(74.0 wt % hexane, 22.4 wt % AOT, and 3.6 wt % aqueous FeCl3 solution at 15 °C), the average diameter
of PPy nanotubes was approximately 94 nm and their length was more than 2 ím. The PPy nanotube
dimensions were affected by synthetic variables such as the weight ratio of aqueous FeCl3 solution/AOT,
type of apolar solvent, and reaction temperature. Moreover, the relationship between the diameter and
the conductivity of the nanotubes was investigated.
ISSN
0743-7463
Language
English
URI
https://hdl.handle.net/10371/48981
DOI
https://doi.org/10.1021/la051447u
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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