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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

Dinakaran Kannaiyan ^1,† , Saji Thomas Kochuveedu ^1,† , Yoon Hee Jang ¹ , Yu Jin Jang ¹ , Ji Yong Lee ¹ , Jieun Lee ¹ , Juyon Lee ¹ , Jooyong Kim ²  and Dong Ha Kim ^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; in revised form: 18 October 2010 / Accepted: 21 October 2010 / Published: 25 October 2010

(This article belongs to the Special Issue Nano-Structures of Block Copolymers)

Download PDF Full-Text [1786 KB, Updated Version, uploaded 1 December 2010 11:09 CET]

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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

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