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Block Copolymer Nanostructures for Technology
Polymers 2010, 2(4), 490-504; doi:10.3390/polym2040490
Article

Enhanced Photophysical Properties of Nanopatterned Titania Nanodots/Nanowires upon Hybridization with Silica via Block Copolymer Templated Sol-Gel Process

1,†
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1,†
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2
 and
1,*
1 Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 11-1 Daehyun-dong, Seodaemun-gu, Seoul 120-750, Korea 2 Department of Organic Materials and Fiber Engineering, Soongsil University, 511 Sangdo-Dong, Dongjak-Gu, Seoul 156-743, Korea The authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 28 September 2010 / Revised: 18 October 2010 / Accepted: 21 October 2010 / Published: 25 October 2010
(This article belongs to the Special Issue Nano-Structures of Block Copolymers)
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Abstract

We fabricated titanium dioxide (TiO2)-silica (SiO2) nanocomposite structures with controlled morphology by a simple synthetic approach using cooperative sol-gel chemistry and block copolymer (BCP) self-assembly. Mixed TiO2-SiO2 sol-gel precursors were blended with amphiphilic poly(styrene-block-ethylene oxide) (PS-b-PEO) BCPs where the precursors were selectively incorporated into the hydrophilic PEO domains. Changing the volumetric ratio of TiO2-SiO2 sol-gel precursor from 5% to 20%, a stepwise structural inversion occurred from nanodot arrays to discrete nanowires. Template free hybrid inorganic nanostructures were produced after the removal of PS-b-PEO by irradiation of UV light. The morphological evolution and photophysical properties were investigated by microscopic studies, UV-visible absorption and photocatalytic properties.
Keywords: hybrid TiO2-SiO2; poly(styrene-block-ethyleneoxide); sol-gel; nanopattern; photocatalyst hybrid TiO2-SiO2; poly(styrene-block-ethyleneoxide); sol-gel; nanopattern; photocatalyst
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Kannaiyan, D.; Kochuveedu, S.T.; Jang, Y.H.; Jang, Y.J.; Lee, J.Y.; Lee, J.; Lee, J.; Kim, J.; Kim, D.H. Enhanced Photophysical Properties of Nanopatterned Titania Nanodots/Nanowires upon Hybridization with Silica via Block Copolymer Templated Sol-Gel Process. Polymers 2010, 2, 490-504.

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