Controllable Synthesis of Conducting Polypyrrole Nanostructures
- 24 December 2005
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 110 (3), 1158-1165
- https://doi.org/10.1021/jp054335k
Abstract
Wire-, ribbon-, and sphere-like nanostructures of polypyrrole have been synthesized by solution chemistry methods in the presence of various surfactants (anionic, cationic, or nonionic surfactant) with various oxidizing agents [ammonium persulfate (APS) or ferric chloride (FeCl3), respectively]. The surfactants and oxidizing agents used in this study have played a key role in tailoring the nanostructures of polypyrrole during the polymerization. It is inferred that the lamellar structures of a mesophase are formed by self-assembly between the cations of a long chain cationic surfactant [cetyltrimethylammonium bromide (CTAB) or dodeyltrimethylammonium bromide (DTAB)] and anions of oxidizing agent APS. These layered mesostructures are presumed to act as templates for the formation of wire- and ribbon-like polypyrrole nanostructures. In contrast, if a short chain cationic surfactant octyltrimethylammonium bromide (OTAB) or nonionic surfactant poly(ethylene glycol) mono-p-nonylphenyl ether (Oπ-10) is used, sphere-like polypyrrole nanostructures are obtained, whichever of the oxidizing agents mentioned above is used. In this case, micelles resulting from self-assembly among surfactant molecules are envisaged to serve as the templates while the polymerization happens. It is also noted that, if anionic surfactant sodium dodeyl surfate (SDS) is used, no characteristic nanostructures of polypyrrole were observed. This may be attributed to the doping effect of anionic surfactants into the resulting polypyrrole chains, and as a result, micelles self-assembled among surfactant molecules are broken down during the polymerization. The effects of monomer concentration, surfactant concentration, and surfactant chain length on the morphologies of the resulting polypyrrole have been investigated in detail. The molecular structures, composition, and electrical properties of the nanostructured polypyrrole have also been investigated in this study.Keywords
This publication has 49 references indexed in Scilit:
- Helical Superstructure of Conductive Polymers as Created by Electrochemical Polymerization by Using Synthetic Lipid Assemblies as a TemplateAngewandte Chemie-International Edition, 2004
- Adsorbed Surfactants as Templates for the Synthesis of Morphologically Controlled Polyaniline and Polypyrrole Nanostructures on Flat Surfaces: From Spheres to Wires to Flat FilmsJournal of the American Chemical Society, 2003
- The First Truly All‐Polymer Electrochromic DevicesAdvanced Materials, 2003
- Organic Semiconductor Nanowires for Field EmissionAdvanced Materials, 2003
- Conducting polymers in electronic chemical sensorsNature Materials, 2003
- Aligned Polythiophene Micro- and NanotubulesAdvanced Materials, 2001
- Cheap and cheerful circuitsNature, 2000
- Nanomaterials: A Membrane-Based Synthetic ApproachScience, 1994
- Conducting Polyaniline Filaments in a Mesoporous Channel HostScience, 1994
- Conductive polymer-semiconductor junction: characterization of poly(3-methylthiophene):cadmium sulfide based photoelectrochemical and photovoltaic cellsThe Journal of Physical Chemistry, 1989