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Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO(2) Thin Films

Pure TiO(2), Y-N single-doped and codoped TiO(2) 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 diff...

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Autores principales: Hamden, Zeineb, Conceição, David, Boufi, Sami, Vieira Ferreira, Luís Filipe, Bouattour, Soraa
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5553417/
https://www.ncbi.nlm.nih.gov/pubmed/28772962
http://dx.doi.org/10.3390/ma10060600
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author Hamden, Zeineb
Conceição, David
Boufi, Sami
Vieira Ferreira, Luís Filipe
Bouattour, Soraa
author_facet Hamden, Zeineb
Conceição, David
Boufi, Sami
Vieira Ferreira, Luís Filipe
Bouattour, Soraa
author_sort Hamden, Zeineb
collection PubMed
description Pure TiO(2), Y-N single-doped and codoped TiO(2) 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 TiO(2) 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.
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spelling pubmed-55534172017-08-14 Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO(2) Thin Films Hamden, Zeineb Conceição, David Boufi, Sami Vieira Ferreira, Luís Filipe Bouattour, Soraa Materials (Basel) Article Pure TiO(2), Y-N single-doped and codoped TiO(2) 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 TiO(2) 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. MDPI 2017-05-31 /pmc/articles/PMC5553417/ /pubmed/28772962 http://dx.doi.org/10.3390/ma10060600 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hamden, Zeineb
Conceição, David
Boufi, Sami
Vieira Ferreira, Luís Filipe
Bouattour, Soraa
Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO(2) Thin Films
title Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO(2) Thin Films
title_full Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO(2) Thin Films
title_fullStr Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO(2) Thin Films
title_full_unstemmed Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO(2) Thin Films
title_short Structural, Morphological, Optical and Photocatalytic Properties of Y, N-Doped and Codoped TiO(2) Thin Films
title_sort structural, morphological, optical and photocatalytic properties of y, n-doped and codoped tio(2) thin films
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5553417/
https://www.ncbi.nlm.nih.gov/pubmed/28772962
http://dx.doi.org/10.3390/ma10060600
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