Oligomer-Assisted Synthesis of Chiral Polyaniline Nanofibers

We report here a novel approach to synthesize chiral PANI nanofibers in an aqueous solution. This new approach requires the following conditions:  (1) Polymerization was carried out in concentrated camphor sulfonic acid solutions. (2) Aniline oligomers were used to accelerate the polymerization reac...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2004-03, Vol.126 (8), p.2278-2279
Main Authors: Li, Wenguang, Wang, Hsing-Lin
Format: Article
Language:English
Subjects:
Aniline Compounds - chemical synthesis
Aniline Compounds - chemistry
Biosensing Techniques
Camphor - chemistry
Circular Dichroism
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Nanotechnology - methods
New materials: theory, design, and fabrication
Other materials
Oxidation-Reduction
Physics
Specific materials
Spectrometry, Fluorescence
Stereoisomerism
Sulfuric Acids - chemistry
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Summary:We report here a novel approach to synthesize chiral PANI nanofibers in an aqueous solution. This new approach requires the following conditions:  (1) Polymerization was carried out in concentrated camphor sulfonic acid solutions. (2) Aniline oligomers were used to accelerate the polymerization reaction. (3) Ammonium persulfate (oxidant) was added incrementally to the aniline solution. The high anisotropy factor of these PANI nanofibers is likely due to the “autocatalytic effect” resulting from lower oxidation potentials of aniline oligomers. Our chemical synthesis of the chiral PANI nanofibers is enantioselective and, under the optimized conditions, has an anisotropy factor (g = Δε/ε) of 2.3 × 10-2.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja039672q