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Materials 2017, 10(6), 600; doi:10.3390/ma10060600

Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO2 Thin Films

Faculty of Science, LCI, University of Sfax, BP1171-3018 Sfax, Tunisia
Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal
Faculty of Science, LSME, University of Sfax, BP1171-3018 Sfax, Tunisia
Authors to whom correspondence should be addressed.
Academic Editor: Klara Hernadi
Received: 11 April 2017 / Revised: 22 May 2017 / Accepted: 25 May 2017 / Published: 31 May 2017
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Pure TiO2, Y-N single-doped and codoped TiO2 powders and thin films deposited on glass beads were successfully prepared using dip-coating and sol-gel methods. The samples were analyzed using grazing angle X-ray diffraction (GXRD), Raman spectroscopy, time resolved luminescence, ground state diffuse reflectance absorption and scanning electron microscopy (SEM). According to the GXRD patterns and micro-Raman spectra, only the anatase form of TiO2 was made evident. Ground state diffuse reflectance absorption studies showed that doping with N or codoping with N and Y led to an increase of the band gap. Laser induced luminescence analysis revealed a decrease in the recombination rate of the photogenerated holes and electrons. The photocatalytic activity of supported catalysts, toward the degradation of toluidine, revealed a meaningful enhancement upon codoping samples at a level of 2% (atomic ratio). The photocatalytic activity of the material and its reactivity can be attributed to a reduced, but significant, direct photoexcitation of the semiconductor by the halogen lamp, together with a charge-transfer-complex mechanism, or with the formation of surface oxygen vacancies by the N dopant atoms. View Full-Text
Keywords: titanium dioxide; photochemistry; band-gap engineering; photocatalysis titanium dioxide; photochemistry; band-gap engineering; photocatalysis

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hamden, Z.; Conceição, D.; Boufi, S.; Vieira Ferreira, L.F.; Bouattour, S. Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO2 Thin Films. Materials 2017, 10, 600.

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