Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/1822/85681 |
Resumo: | The optical parameters of crystalline anatase and polycrystalline anatase films prepared by reactive magnetron sputtering were examined by spectroscopic ellipsometry and optical transmittance spectroscopy, respectively. Some films were doped with aluminium or chromium. In general, the values of the optical bandgap for the films are consistently blue-shifted as compared with the crystal. The blue shift is also found for some films doped with Al and Cr. The width of the absorption bands is considerably narrower in the films than in the crystal. These effects are interpreted as resulting from the spatial confinement of electrons and holes in the TiO2 microcrystallites. The average crystallite size determined from the shift of the optical gap was found to be in the range ~5–8 nm, in excellent agreement with the data obtained from small-angle X-ray diffractometry. |
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Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin filmTitanium oxideOptical propertiesQuantum effectsStructural propertiesCiências Naturais::Ciências FísicasScience & TechnologyThe optical parameters of crystalline anatase and polycrystalline anatase films prepared by reactive magnetron sputtering were examined by spectroscopic ellipsometry and optical transmittance spectroscopy, respectively. Some films were doped with aluminium or chromium. In general, the values of the optical bandgap for the films are consistently blue-shifted as compared with the crystal. The blue shift is also found for some films doped with Al and Cr. The width of the absorption bands is considerably narrower in the films than in the crystal. These effects are interpreted as resulting from the spatial confinement of electrons and holes in the TiO2 microcrystallites. The average crystallite size determined from the shift of the optical gap was found to be in the range ~5–8 nm, in excellent agreement with the data obtained from small-angle X-ray diffractometry.Elsevier Science SAUniversidade do MinhoViseu, T. M. R.Almeida, B. G.Stchakovsky, M.Drevillon, B.Ferreira, M. I. C.Sousa, J. B.20012001-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/85681engViseu, T. M. R., Almeida, B., Stchakovsky, M., Drevillon, B., Ferreira, M. I. C., & Sousa, J. B. (2001, December). Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film. Thin Solid Films. Elsevier BV. http://doi.org/10.1016/s0040-6090(01)01479-10040-609010.1016/S0040-6090(01)01479-1https://www.sciencedirect.com/science/article/pii/S0040609001014791info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-29T01:20:05Zoai:repositorium.sdum.uminho.pt:1822/85681Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:09:59.663429Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film |
title |
Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film |
spellingShingle |
Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film Viseu, T. M. R. Titanium oxide Optical properties Quantum effects Structural properties Ciências Naturais::Ciências Físicas Science & Technology |
title_short |
Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film |
title_full |
Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film |
title_fullStr |
Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film |
title_full_unstemmed |
Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film |
title_sort |
Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film |
author |
Viseu, T. M. R. |
author_facet |
Viseu, T. M. R. Almeida, B. G. Stchakovsky, M. Drevillon, B. Ferreira, M. I. C. Sousa, J. B. |
author_role |
author |
author2 |
Almeida, B. G. Stchakovsky, M. Drevillon, B. Ferreira, M. I. C. Sousa, J. B. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Viseu, T. M. R. Almeida, B. G. Stchakovsky, M. Drevillon, B. Ferreira, M. I. C. Sousa, J. B. |
dc.subject.por.fl_str_mv |
Titanium oxide Optical properties Quantum effects Structural properties Ciências Naturais::Ciências Físicas Science & Technology |
topic |
Titanium oxide Optical properties Quantum effects Structural properties Ciências Naturais::Ciências Físicas Science & Technology |
description |
The optical parameters of crystalline anatase and polycrystalline anatase films prepared by reactive magnetron sputtering were examined by spectroscopic ellipsometry and optical transmittance spectroscopy, respectively. Some films were doped with aluminium or chromium. In general, the values of the optical bandgap for the films are consistently blue-shifted as compared with the crystal. The blue shift is also found for some films doped with Al and Cr. The width of the absorption bands is considerably narrower in the films than in the crystal. These effects are interpreted as resulting from the spatial confinement of electrons and holes in the TiO2 microcrystallites. The average crystallite size determined from the shift of the optical gap was found to be in the range ~5–8 nm, in excellent agreement with the data obtained from small-angle X-ray diffractometry. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001 2001-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://hdl.handle.net/1822/85681 |
url |
https://hdl.handle.net/1822/85681 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Viseu, T. M. R., Almeida, B., Stchakovsky, M., Drevillon, B., Ferreira, M. I. C., & Sousa, J. B. (2001, December). Optical characterisation of anatase: a comparative study of the bulk crystal and the polycrystalline thin film. Thin Solid Films. Elsevier BV. http://doi.org/10.1016/s0040-6090(01)01479-1 0040-6090 10.1016/S0040-6090(01)01479-1 https://www.sciencedirect.com/science/article/pii/S0040609001014791 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier Science SA |
publisher.none.fl_str_mv |
Elsevier Science SA |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799133348520525824 |