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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2017
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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. |
format | Online Article Text |
id | pubmed-5553417 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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