Designed self-doped titanium oxide thin tilms for efficient visible-light photocatalysis (Articolo in rivista)

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Label
  • Designed self-doped titanium oxide thin tilms for efficient visible-light photocatalysis (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • Justicia I., Ordejón P., Canto G., Mozos J.L., Fraxedas J., Battiston G.A., Gerbasi R., Figueras A. Justicia I.1, Ordejón P. 2, Canto G. 3, Mozos J.L. 4, Fraxedas J. 5, Battiston G.A. 6, Gerbasi R. 7, Figueras A. 8 (2002)
    Designed self-doped titanium oxide thin tilms for efficient visible-light photocatalysis
    in Advanced materials (Weinh., Print)
    (literal)
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  • Justicia I., Ordejón P., Canto G., Mozos J.L., Fraxedas J., Battiston G.A., Gerbasi R., Figueras A. Justicia I.1, Ordejón P. 2, Canto G. 3, Mozos J.L. 4, Fraxedas J. 5, Battiston G.A. 6, Gerbasi R. 7, Figueras A. 8 (literal)
Pagina inizio
  • 1399 (literal)
Pagina fine
  • 1402 (literal)
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  • The great environmental need to eliminate pollutants makes the search for new catalyst materials, with improved properties and efficiencies, a very important topic. Chemical vapour deposition (CVD) is a technique in which chemical components in vapour phase react to form a solid film that deposits atomistically on a suitably placed substrate, and is able to create films of widely varying stoichiometry or structure (i.e. nanostructured materials). The main objective of this work is to advance the technology for photodegradation of toxic compounds from state-of-art overall efficiency of 0.2% for TiO2 under solar irradiation conditions to more than 15%. Any improvement of photocatalytic efficiency of TiO2 by shifting its optical response from UV to the visible range will be an ineludible milestone for increasing the efficiency and diminishing the economic costs, demonstrating a great technological importance for modern society and future generations. (literal)
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  • 14 (literal)
Rivista
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  • Semiconducting TiO2 has been proved to be an excellent photocatalyst which allows the degradation and ultimately the mineralization of stable organic pollutants such as detergents, dyes and pesticides in water. However, the large energy needed to activate the photocatalysis for the anatase phase (3.2 eV) requires the use of UV light instead of the cheaper and more readily available energy source such as the solar spectrum or even interior lighting. The objectives of our work consist in demonstrating that titania band gap energy can be lowered by inducing oxygen sub-stoichiometry in the lattice along with the fact that the best way to prepare such a material is as a thin film. The insertion of oxygen vacancies in the anatase structure induces the defect band to reach a width of 0.2 eV, starting to overlap with the conduction band. The electrons in these defect states are able to hop and contribute to conduction thus enhancing the photodegradation properties of the self-doped titania. These vacancy-induced bands of electronic states facilitate the transport of the photocarriers to the active sites in the surface where the degradation process takes place. The first experimental results indicating that films with strong oxygen sub-stoichiometry show photocatalytic properties in the visible range, are also given. (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 6,7 ICIS-CNR; 1,2,3,4,5 ICMAB/CSIC; Campus UAB, 08193 Bellaterra, Spain (literal)
Titolo
  • Designed self-doped titanium oxide thin tilms for efficient visible-light photocatalysis (literal)
Abstract
  • Anatase phase of titanium oxide is the most promising photocatalyst material for organic pollutant degradation. However, due to its large band gap energy (3.2 eV) it is not viable to use using sunlight as an energy source for the photocatalysis activation and so ultraviolet (UV) radiation below the wavelength of 380 nm is thus required. This paper focuses on the experimental demonstration of the reduction of this large band gap energy by inducing defects in the anatase structure under the form of oxygen sub-stoichiometry. TiO2 thin films were prepared in an MOCVD (Metal Organic Chemical Vapour Deposition) reactor. The samples stoichiometry was measured by the RBS (Rutherford Backscattering Spectrometry) technique. Optical characterisation was also performed and the photodegradation activity in the visible range was tested. (literal)
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