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Coassembly of metal and titanium dioxide nanocrystals directed by monolayered block copolymer inverse micelles for enhanced photocatalytic performance
- Coassembly of metal and titanium dioxide nanocrystals directed by monolayered block copolymer inverse micelles for enhanced photocatalytic performance
- Acharya H.; Sung J.; Bae I.; Kim T.; Kim D.H.; Park C.
- Ewha Authors
- SCOPUS Author ID
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- Chemistry - A European Journal
- Chemistry - A European Journal vol. 18, no. 46, pp. 14695 - 14701
- SCI; SCIE; SCOPUS
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- Functional nanostructures of self-assembled block copolymers (BCPs) incorporated with various inorganic nanomaterials have received considerable attention on account of their many potential applications. Here we demonstrate the two-dimensional self-assembly of anisotropic titanium dioxide (TiO 2) nanocrystals (NCs) and metal nanoparticles (NPs) directed by monolayered poly(styrene)-block-poly(4-vinylpyridine) (PS-b-P4VP) copolymer inverse micelles. The independent position-selective assembly of TiO 2 NCs and silver nanoparticles (AgNPs) preferentially in the intermicelle corona regions and the core of micelles, respectively, for instance, was accomplished by spin-coating a mixture solution of PS-b-P4VP and ex situ synthesized TiO 2 NCs, followed by the reduction of Ag salts coordinated in the cores of micelles into AgNPs. Hydrophobic TiO 2 NCs with a diameter and length of approximately 3 nm and 20-30 nm, respectively, were preferentially sequestered in the intermicelle nonpolar PS corona regions energetically favorable with the minimum entropic packing penalty. Subsequent high-temperature annealing at 550 °C not only effectively removed the block copolymer but also transformed the TiO 2 NCs into connected nanoparticles, thus leading to a two-dimensionally ordered TiO 2 network in which AgNPs were also self-organized. The enhanced photocatalytic activity of the AgNP-decorated TiO 2 networks by approximately 27 and 44 % over that of Ag-free TiO 2 networks and randomly deposited TiO 2 nanoparticles, respectively, was confirmed by the UV degradation property of methylene blue. Of micelles and metals: Coassembly of anisotropic TiO 2 nanocrystals and Ag nanoparticles was achieved in the corona and core regions of monolayered block copolymer micelles, respectively (see figure). Thermal heating removed the block copolymer and the resulting TiO 2 network nanostructure with Ag nanoparticles decorating its pores exhibited excellent photocatalytic performance. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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