Characterization of TiO2 nanoparticles in langmuir-blodgett films
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/5589 |
Resumo: | In this work we have synthesized TiO2 nanoparticles, using either a sol–gel base catalysed process in the interior of CTAB reversed micelles (TiO2 CTAB sol), or the neutralization of a TiO2/H2SO4 solution in the interior of AOT reversed micelles. From the absorption and emission data of the TiO2 nanoparticles it is possible to conclude that in the sol–gel route there remains alkoxide groups in the structure, originating transitions lower than the energy gap of TiO2 semiconductor. These transitions disappear in the neutralization procedure, where the alkoxide groups are absent in the structure. We have assigned the observed indirect and direct optical transitions according to the anatase band structure. TiO2 Langmuir-Blodgett (LB) films were prepared either by direct deposition of titanium isopropoxide or by deposition of the TiO2 CTAB sol. These films showed photoluminescence, which was attributed to band-gap emission and to surface recombination of defect states. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Characterization of TiO2 nanoparticles in langmuir-blodgett filmsTiO2NanoparticlesBand gapPhotoluminescenceScience & TechnologyIn this work we have synthesized TiO2 nanoparticles, using either a sol–gel base catalysed process in the interior of CTAB reversed micelles (TiO2 CTAB sol), or the neutralization of a TiO2/H2SO4 solution in the interior of AOT reversed micelles. From the absorption and emission data of the TiO2 nanoparticles it is possible to conclude that in the sol–gel route there remains alkoxide groups in the structure, originating transitions lower than the energy gap of TiO2 semiconductor. These transitions disappear in the neutralization procedure, where the alkoxide groups are absent in the structure. We have assigned the observed indirect and direct optical transitions according to the anatase band structure. TiO2 Langmuir-Blodgett (LB) films were prepared either by direct deposition of titanium isopropoxide or by deposition of the TiO2 CTAB sol. These films showed photoluminescence, which was attributed to band-gap emission and to surface recombination of defect states.SpringerUniversidade do MinhoCoutinho, Paulo J. G.Barbosa, M. Teresa C. M.2006-052006-05-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/5589eng"Journal of fluorescence". ISSN 1053-0509. 16:3 (May 2006) 387-392.1053-050910.1007/s10895-006-0080-1The original publication is available at www.springerlink.cominfo: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:RCAAP2023-07-21T12:29:35ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Characterization of TiO2 nanoparticles in langmuir-blodgett films |
title |
Characterization of TiO2 nanoparticles in langmuir-blodgett films |
spellingShingle |
Characterization of TiO2 nanoparticles in langmuir-blodgett films Coutinho, Paulo J. G. TiO2 Nanoparticles Band gap Photoluminescence Science & Technology |
title_short |
Characterization of TiO2 nanoparticles in langmuir-blodgett films |
title_full |
Characterization of TiO2 nanoparticles in langmuir-blodgett films |
title_fullStr |
Characterization of TiO2 nanoparticles in langmuir-blodgett films |
title_full_unstemmed |
Characterization of TiO2 nanoparticles in langmuir-blodgett films |
title_sort |
Characterization of TiO2 nanoparticles in langmuir-blodgett films |
author |
Coutinho, Paulo J. G. |
author_facet |
Coutinho, Paulo J. G. Barbosa, M. Teresa C. M. |
author_role |
author |
author2 |
Barbosa, M. Teresa C. M. |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Coutinho, Paulo J. G. Barbosa, M. Teresa C. M. |
dc.subject.por.fl_str_mv |
TiO2 Nanoparticles Band gap Photoluminescence Science & Technology |
topic |
TiO2 Nanoparticles Band gap Photoluminescence Science & Technology |
description |
In this work we have synthesized TiO2 nanoparticles, using either a sol–gel base catalysed process in the interior of CTAB reversed micelles (TiO2 CTAB sol), or the neutralization of a TiO2/H2SO4 solution in the interior of AOT reversed micelles. From the absorption and emission data of the TiO2 nanoparticles it is possible to conclude that in the sol–gel route there remains alkoxide groups in the structure, originating transitions lower than the energy gap of TiO2 semiconductor. These transitions disappear in the neutralization procedure, where the alkoxide groups are absent in the structure. We have assigned the observed indirect and direct optical transitions according to the anatase band structure. TiO2 Langmuir-Blodgett (LB) films were prepared either by direct deposition of titanium isopropoxide or by deposition of the TiO2 CTAB sol. These films showed photoluminescence, which was attributed to band-gap emission and to surface recombination of defect states. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-05 2006-05-01T00:00:00Z |
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 |
http://hdl.handle.net/1822/5589 |
url |
http://hdl.handle.net/1822/5589 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"Journal of fluorescence". ISSN 1053-0509. 16:3 (May 2006) 387-392. 1053-0509 10.1007/s10895-006-0080-1 The original publication is available at www.springerlink.com |
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 |
Springer |
publisher.none.fl_str_mv |
Springer |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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repository.mail.fl_str_mv |
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1777303770585104384 |