Enhanced photophysical properties of nanopatterned titania nanodots/nanowires upon hybridization with silica via block copolymer templated sol-gel process

Dinakaran Kannaiyan, Saji Thomas Kochuveedu, Yoon Hee Jang, Yu Jin Jang, Ji Yong Lee, Jieun Lee, Juyon Lee, Jooyong Kim, Dong Ha Kim

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

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.

Original languageEnglish
Pages (from-to)490-504
Number of pages15
JournalPolymers
Volume2
Issue number4
DOIs
StatePublished - Dec 2010

Keywords

  • Hybrid TiO-SiO
  • Nanopattern
  • Photocatalyst
  • Poly(styrene-block-ethyleneoxide)
  • Sol-gel

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