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
作者： Min-Ah Cha , Changhak Shin , Dinakaran Kannaiyan , Yoon Hee Jang , Saji Thomas Kochuveedu
DOI: 10.1039/B907922J
关键词:
摘要: 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) viaspin-coating common solutions BCP inorganic precursors. TiO2nanostructures two extreme reverse morphologies, i.e., TiO2 dot-in-PS matrix PS dot-in-TiO2 matrix, obtained increasing the volumetric ratio precursor from 10 to 50 vol%. Incorporation silver nitrate into afforded hybrid Ag/TiO2 thin film hexagonally packed arrays nanodots. Upon removal PS-b-PEO template initial films UV treatment, having same lateral as derived. Among structures investigated, mesoporous exhibited best photocatalytic performance. The surface/internal morphology mechanism structural evolution investigated atomic force microscopy (AFM), transmission electron (TEM), grazing-incidence small-angle X-ray scattering (GISAXS).
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