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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
  • 38
    Citations
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    Usage
  • 40
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    38
    • Citation Indexes
      37
    • Policy Citations
      1
      • Policy Citation
        1
  • Captures
    40

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

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