Facile preparation of stable aqueous titania sols for fabrication of highly active TiO photocatalyst films
Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 3, Issue: 4, Page: 1688-1695
2015
- 38Citations
- 40Captures
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Article Description
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 TiO 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 TiO 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 TiO 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. This journal is
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84919898218&origin=inward; http://dx.doi.org/10.1039/c4ta04680c; https://xlink.rsc.org/?DOI=C4TA04680C; http://xlink.rsc.org/?DOI=C4TA04680C; http://pubs.rsc.org/en/content/articlepdf/2015/TA/C4TA04680C; https://dx.doi.org/10.1039/c4ta04680c; https://pubs.rsc.org/en/content/articlelanding/2015/ta/c4ta04680c
Royal Society of Chemistry (RSC)
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