Layer-by-layer deposition of organically capped quantum dots

Detalhes bibliográficos
Autor(a) principal: Neves, M.C.
Data de Publicação: 2006
Outros Autores: Pereira, A.S., Peres, M., Kholkin, A., Monteiro, T., Trindade, T.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/6637
Resumo: Cadmium chalcogenide quantum dots (QD's) were synthesised using a single source approach while zinc oxide QD's were obtained by a colloidal technique. In both situations the dots were surface capped with tri-octylphosphine oxide (TOPO) hence leading to nanodispersed systems in organic solvents such as toluene. The organically capped QD's (CdSe, CdS and ZnO) were used as building-units to fabricate LbL (layer-by-layer) films on glass and quartz substrates. A linear increase in the visible light absorbance (due to the QD's) with the number of deposited layers indicates that multi-layered systems have been fabricated. In order to investigate the effect of the LbL manipulation on the integrity of the QD's, comparative studies on the optical properties of the starting QD's and the nanostructured films have been performed. The observation of quantum size effects in both cases suggests minimal degradation of the QD's though clustering had probably occurred, a point which was further confirmed by AFM analysis.
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spelling Layer-by-layer deposition of organically capped quantum dotsLayer-by-layer methodsNanostructuresQuantum dotsSemiconductorsCadmium chalcogenide quantum dots (QD's) were synthesised using a single source approach while zinc oxide QD's were obtained by a colloidal technique. In both situations the dots were surface capped with tri-octylphosphine oxide (TOPO) hence leading to nanodispersed systems in organic solvents such as toluene. The organically capped QD's (CdSe, CdS and ZnO) were used as building-units to fabricate LbL (layer-by-layer) films on glass and quartz substrates. A linear increase in the visible light absorbance (due to the QD's) with the number of deposited layers indicates that multi-layered systems have been fabricated. In order to investigate the effect of the LbL manipulation on the integrity of the QD's, comparative studies on the optical properties of the starting QD's and the nanostructured films have been performed. The observation of quantum size effects in both cases suggests minimal degradation of the QD's though clustering had probably occurred, a point which was further confirmed by AFM analysis.MSF2012-02-18T11:00:58Z2006-01-01T00:00:00Z2006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/6637eng0255-547610.4028/www.scientific.net/MSF.514-516.1111Neves, M.C.Pereira, A.S.Peres, M.Kholkin, A.Monteiro, T.Trindade, T.info: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:RCAAP2024-02-22T11:08:08Zoai:ria.ua.pt:10773/6637Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:43:27.410906Repositório 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 Layer-by-layer deposition of organically capped quantum dots
title Layer-by-layer deposition of organically capped quantum dots
spellingShingle Layer-by-layer deposition of organically capped quantum dots
Neves, M.C.
Layer-by-layer methods
Nanostructures
Quantum dots
Semiconductors
title_short Layer-by-layer deposition of organically capped quantum dots
title_full Layer-by-layer deposition of organically capped quantum dots
title_fullStr Layer-by-layer deposition of organically capped quantum dots
title_full_unstemmed Layer-by-layer deposition of organically capped quantum dots
title_sort Layer-by-layer deposition of organically capped quantum dots
author Neves, M.C.
author_facet Neves, M.C.
Pereira, A.S.
Peres, M.
Kholkin, A.
Monteiro, T.
Trindade, T.
author_role author
author2 Pereira, A.S.
Peres, M.
Kholkin, A.
Monteiro, T.
Trindade, T.
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Neves, M.C.
Pereira, A.S.
Peres, M.
Kholkin, A.
Monteiro, T.
Trindade, T.
dc.subject.por.fl_str_mv Layer-by-layer methods
Nanostructures
Quantum dots
Semiconductors
topic Layer-by-layer methods
Nanostructures
Quantum dots
Semiconductors
description Cadmium chalcogenide quantum dots (QD's) were synthesised using a single source approach while zinc oxide QD's were obtained by a colloidal technique. In both situations the dots were surface capped with tri-octylphosphine oxide (TOPO) hence leading to nanodispersed systems in organic solvents such as toluene. The organically capped QD's (CdSe, CdS and ZnO) were used as building-units to fabricate LbL (layer-by-layer) films on glass and quartz substrates. A linear increase in the visible light absorbance (due to the QD's) with the number of deposited layers indicates that multi-layered systems have been fabricated. In order to investigate the effect of the LbL manipulation on the integrity of the QD's, comparative studies on the optical properties of the starting QD's and the nanostructured films have been performed. The observation of quantum size effects in both cases suggests minimal degradation of the QD's though clustering had probably occurred, a point which was further confirmed by AFM analysis.
publishDate 2006
dc.date.none.fl_str_mv 2006-01-01T00:00:00Z
2006
2012-02-18T11:00:58Z
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/6637
url http://hdl.handle.net/10773/6637
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0255-5476
10.4028/www.scientific.net/MSF.514-516.1111
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