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Formation Mechanism of Conducting Polypyrrole Nanotubes in Reverse Micelle Systems
Cited 152 time in
Web of Science
Cited 157 time in Scopus
- Authors
- 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
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