Journal of Sol-Gel Science and Technology

, Volume 26, Issue 1, pp 517–521

Evaluation of Photocatalytic Activity of Transparent Anatase Nanocrystals-Dispersed Silica Films Prepared by the Sol-Gel Process with Hot Water Treatment

  • Authors
  • Atsunori Matsuda
  • Tatsuo Matoda
  • Yoshinori Kotani
  • Toshihiro Kogure
  • Masahiro Tatsumisago
  • Tsutomu Minami

DOI: 10.1023/A:1020751416445

Cite this article as:
Matsuda, A., Matoda, T., Kotani, Y. et al. Journal of Sol-Gel Science and Technology (2003) 26: 517. doi:10.1023/A:1020751416445


Anatase nanocrystals were precipitated mainly at the surface of the silica-titania gel films with hot water treatment, whereas the addition of poly(ethylene glycol) (PEG) in the films led to the dispersion of anatase nanocrystals in the whole of the films after the treatment. Both films with and without PEG showed high photocatalytic activities for acetaldehyde, NOx and stearic acid in the gas-solid system, and for methylene blue and potassium iodide in the liquid-solid system. The addition of PEG improved the photocatalytic activities of the resultant films due to the smaller anatase crystallites and the porous film structure. The residual silica under-layer of the superficially anatase-precipitated films is expected to act as a protective one for an organic polymer substrate against the photocatalytic degradation.

anatasenanocrystalssilica-titaniahot water treatmentphotocatalytic activity

Copyright information

© Kluwer Academic Publishers 2003