Visible-Light Photocatalysis in Titania-Based Mesoporous Thin Films

Authors

  • Saurabh S. Soni,

    1. Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087 Université du Maine 72085 Le Mans Cedex 09 (France).
    2. Present address: Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar 388120, India
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  • Mark J. Henderson,

    1. Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087 Université du Maine 72085 Le Mans Cedex 09 (France).
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  • Jean-François Bardeau,

    1. Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087 Université du Maine 72085 Le Mans Cedex 09 (France).
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  • Alain Gibaud

    Corresponding author
    1. Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087 Université du Maine 72085 Le Mans Cedex 09 (France).
    • Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087 Université du Maine 72085 Le Mans Cedex 09 (France).
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  • This work was partly funded by the French ACI Nanoscience under the acronym “Autofimehypodir” and by the French ANR OxTiMIBPhotobatterie. The authors thank the European Synchrotron Radiation Facility (ESRF, France) for providing beam time at ID 01 and Dr. Till Metzger for assistance during the GISAXS measurements. We thank Dr. Jonathan ▪ Hamon, Institute des Matériaux Jean Rouxel, Nantes, France, for XPS measurements. Mr. Mohmed Ramzi Ammar and Unité de Chimie Organique Moléculaire et Macromoléculaire (UCO2M), UMR no. 6011, France, are acknowledged for assistance with the UV-visible spectrophotometry measurements, and also Mr. Minhao Yan for AFM measurements. Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

original image

Photocatalytic activity in the visible part of the solar spectrum (442 nm) is demonstrated for highly organized mesoporous nanocrystalline titania thin films doped with thiourea. This property, which is of interest for the further development of photovoltaic devices operating in sunlight, is revealed by monitoring the photodegradation of methylene blue (see figure) upon contact with an N-doped TiO2 film as a function of irradiation time and film thickness.

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