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Title: Fabrication of TiO2 binary inverse opals without overlayers via the sandwich-vacuum infiltration of precursor
Authors: Cai, Z.
Teng, J.
Xiong, Z.
Li, Y.
Li, Q.
Lu, X. 
Zhao, X.S. 
Issue Date: 19-Apr-2011
Citation: Cai, Z., Teng, J., Xiong, Z., Li, Y., Li, Q., Lu, X., Zhao, X.S. (2011-04-19). Fabrication of TiO2 binary inverse opals without overlayers via the sandwich-vacuum infiltration of precursor. Langmuir 27 (8) : 5157-5164. ScholarBank@NUS Repository.
Abstract: A sandwich-vacuum method was demonstrated for the fabrication of titania (TiO2) binary inverse opals with an open surface. In this method, a moisture-stable TiO2 precursor was backfilled into the interstitial spaces of polystyrene binary colloidal crystals (PS bCCs), which served as a template. Removal of the template by calcination yielded TiO2 binary inverse opals with a 3D-ordered macroporous (3DOM) structure. Optical reflectance spectra revealed the existence of a pseudostop band gap in the 3DOM TiO2 samples. The position of the pseudostop band gap shifted to the low-wavelength region as the number ratio of small over large PS spheres was increased in the template. The sandwich-vacuum method proved to be simple and rapid for the fabrication of TiO2 binary inverse opals without overlayers in large domains. The 3DOM TiO2 materials were used as a photocatalyst for the degradation of benzoic acid. Results showed that in comparison to TiO2 nanoparticles prepared under the same sintering conditions, the 3DOM TiO2 materials displayed enhanced photocatalytic activity. © 2011 American Chemical Society.
Source Title: Langmuir
ISSN: 07437463
DOI: 10.1021/la200111j
Appears in Collections:Staff Publications

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