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A versatile approach to the fabrication of TiO2 nanostructures with reverse morphology and mesoporous Ag/TiO2 thin films via cooperative PS-b-PEO self-assembly and a sol-gel process

Title
A versatile approach to the fabrication of TiO2 nanostructures with reverse morphology and mesoporous Ag/TiO2 thin films via cooperative PS-b-PEO self-assembly and a sol-gel process
Authors
Cha M.-A.Shin C.Kannaiyan D.Jang Y.H.Kochuveedu S.T.Ryu D.Y.Kim D.H.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2009
Journal Title
Journal of Materials Chemistry
ISSN
0959-9428JCR Link
Citation
vol. 19, no. 39, pp. 7245 - 7250
Indexed
SCOPUS WOS scopus
Abstract
Hybrid titanium dioxide (TiO2) nanostructures with engineered morphologies were produced by a simple synthetic approach based on cooperative sol-gel chemistry and self-assembly of amphiphilic poly(styrene-block-ethylene oxide) (PS-b-PEO) block copolymer (BCP) via spin-coating common solutions of BCP and inorganic precursors. TiO2 nanostructures with two extreme reverse morphologies, i.e., TiO2 dot-in-PS matrix and PS dot-in-TiO2 matrix, were obtained by increasing the volumetric ratio of the TiO2 sol-gel precursor from 10 to 50 vol%. Incorporation of silver nitrate into the TiO2 matrix afforded a hybrid Ag/TiO 2 thin film with hexagonally packed arrays of PS nanodots. Upon removal of the PS-b-PEO template from the initial hybrid films by UV treatment, inorganic nanostructures having the same lateral morphologies as the initial films were derived. Among the structures investigated, the Ag/TiO2 mesoporous film exhibited the best photocatalytic performance. The surface/internal morphology and the mechanism of structural evolution were investigated by atomic force microscopy (AFM), transmission electron microscopy (TEM), and grazing-incidence small-angle X-ray scattering (GISAXS). © 2009 The Royal Society of Chemistry.
DOI
10.1039/b907922j
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자연과학대학 > 화학·나노과학전공 > Journal papers
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