Mesoscale Integration in Titania/J-Aggregate Hybrid Nanofibers

作者：Patil A J; Young Chul Lee; Ji Won Yang; Mann S

来源：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2012, 51(3): 733-7.

DOI：10.1002/anie.201101383

• mesoscale integration
• titania-j-aggregate hybrid nanofibers
• nanorods
• nanotapes
• internally ordered hybrid mesostructure
• coaligned columnar arrays
• [H4TPPS]2
• ions
• porphyrin molecules
• oligomers
• hydrolyzed titanium (IV) oxo species
• condensed titanium (IV) hydroxy species
• porphyrin array titania encapsulation
• optical properties
• chiral properties
• hydrothermal stability
• J-aggregate supramolecular structure
• enhanced photocatalytic activity
• mesostructured hybrids
• anatase nanoparticle dispersion comparison
• electron transfer rate
• hole-electron pair recombination
• optical processing
• electronic processing
• light harvesting
• energy transport
• sensing
• photocatalysis
• quasi1D nanostructures
• tetrakis(4-sulfonatophenyl)porphine
• TiO2

Herein, we describe a facile procedure for producing titania/ J-aggregate nanorods and nanotapes that comprise an internally ordered hybrid mesostructure of co-aligned columnar arrays of [H4TPPS]2- ions in which individual stacks of the porphyrin molecules are encased with oligomers of hydrolyzed/condensed titanium(IV) hydroxy/oxo species. We show that titania encapsulation of the porphyrin arrays at the molecular level preserves the optical and chiral properties and improves the hydrothermal stability of the J-aggregate supramolecular structure. We also demonstrate enhanced photocatalytic activity for the mesostructured hybrids compared to anatase nanoparticle dispersions of similar surface area, suggesting that close-to-molecular scale integration of the components has a significant influence on the rate of electron transfer and hole-electron pair recombination. Taken together, our results suggest that titania/J-aggregate mesostructured hybrids could have potential use in a wide range of applications involving optical and electronic processing, light harvesting, energy transport, sensing, or photocatalysis.

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