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Self-Assembly of Aminoclay Template-Assisted J-aggregate Fibers

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The self-assembly of molecular building blocks is important in the construction of nanoscale architectures with unique properties. J-aggregate molecular building blocks are formed by the self-assembly of porphyrin antenna units that display good light-harvesting and self exciton trapping properties. Porphyrin-based J-aggregate suprastructures self-organized into rods, tapes, bundles, and tubes on the nanoscale level. J-aggregates must be stabilized under acidic conditions, and techniques for achieving the self-assembly of discrete J-aggregates under such conditions must be developed to increase the mechanical, thermal, and chemical stabilities of the aggregates. Herein, the supramolecular wrapping of J-aggregate fibers with water-solubilized aminoclay and oligomers is introduced. The addition of aminoclay to J-aggregate solutions induced formation of silica-sheathed J-aggregate hybrid suprastructures. In case of addition of low molecular weight oligomers strengthened the stability of the wrapped J-aggregate fiber bundles via the association between the cationic oligomer dispersions and the anionic SO– 4groups of the J-aggregates, which preserved the optical properties of the J-aggregates at (or near) neutral pH. Interestingly, acidification of the porphyrin/oligomer mixtures produced J-aggregate hybrid suprastructures with a uniform diameter. The hybrid components described here are anticipated to be useful in optoelectronic devices and energy-related systems.
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Document Type: Research Article

Publication date: March 1, 2012

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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