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Issue 4, 2015
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Facile preparation of stable aqueous titania sols for fabrication of highly active TiO2 photocatalyst films

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Abstract

Highly stable aqueous titania sols were prepared via a facile process using titanium tetraisopropoxide in the co-existence of acetylacetone and acetic acid. Their co-existence efficiently suppressed the hydrolysis and condensation reaction of titanium tetraisopropoxide even in water, retaining the diameter of titania colloidal particles lower than 10 nm (average diameter d = ca. 4 nm). The titania sols possessed significantly high stability for more than 1 year and could be easily coated on various substrates such as quartz glass via a simple spin-coating method, forming highly homogeneous and transparent films. The calcinations of the coated films in the air at 600 °C produced densely packed anatase TiO2 particles; the diameter was retained below 50 nm even after the calcinations at 900 °C without phase transition to rutile, maintaining the fairly good transparency of the films. On the other hand, the TiO2 particles prepared on a quartz substrate from other precursors, such as titanium–peroxo-citrate complexes, were found to transform from anatase into the rutile phase at above 700 °C with a significant increase in the particle size up to ca. 200 nm. The TiO2 films prepared from the present aqueous titania sols exhibited higher activity for photo-induced surface superhydrophilicity under UV light irradiation than those prepared from other precursors.

Graphical abstract: Facile preparation of stable aqueous titania sols for fabrication of highly active TiO2 photocatalyst films

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Publication details

The article was received on 09 Sep 2014, accepted on 14 Nov 2014 and first published on 18 Nov 2014


Article type: Paper
DOI: 10.1039/C4TA04680C
Citation: J. Mater. Chem. A, 2015,3, 1688-1695
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    Facile preparation of stable aqueous titania sols for fabrication of highly active TiO2 photocatalyst films

    S. Okunaka, H. Tokudome, Y. Hitomi and R. Abe, J. Mater. Chem. A, 2015, 3, 1688
    DOI: 10.1039/C4TA04680C

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