On the synergistic coupling properties of composite CdS/TiO 2 nanoparticle arrays confined in nanopatterned hybrid thin films

Dinakaran Kannaiyan, Eunhye Kim, Nayoun Won, Kang Wook Kim, Yoon Hee Jang, Min Ah Cha, Du Yeol Ryu, Sungjee Kim, Dong Ha Kim

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Abstract

Two-dimensional (2D) arrays of hybrid CdS/TiO 2 composite nanodots were fabricated on solid substrates using amphiphilic poly(styrene-block-ethylene oxide) diblock copolymer (PS-b-PEO) micelles as templates loaded with CdS nanoparticles (NPs) and TiO 2 sol-gel precursors. The inorganic precursors were selectively incorporated into PEO domains of PS-b-PEO due to the specific interactions. The addition of CdS quantum dots (QDs) into thin films of the PS-b-PEO/TiO 2 sol-gel mixture led to the morphological changes from mixed wire/hexagonal dot to well-defined, quasi-hexagonal dot arrays. The PS-b-PEO/TiO 2 /CdS system showed an enhanced absorption along with red shift behavior in the UV-visible spectral range compared with the PS-b-PEO/TiO 2 films. Photoluminescence (PL) studies showed a quenching of CdS emission in the presence of TiO 2 . An enhanced photocatalytic degradation of methylene blue (MB) was observed in the hybrid PS-b-PEO/TiO 2 /CdS thin film.

Original languageEnglish
Pages (from-to)677-682
Number of pages6
JournalJournal of Materials Chemistry
Volume20
Issue number4
DOIs
Publication statusPublished - 2010 Mar 25

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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