Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico

Optical and structural properties of nanopowders of Y3Al5O12 (YAG), Y3-xEuxAl5O12 (YAG:Eu) and Y3-xCexAl5O12 (YAG:Ce) (x=1 and 2mol%) were studied in the present work. The samples were synthesized via the Proteico Sol-Gel Process. X-ray diffraction showed that YAG single phase could be obtained afte...

Nível de Acesso:openAccess
Publication Date:2013
Main Author: Santos, Daniel Felix Dias dos lattes
Orientador/a: Valério, Mário Ernesto Giroldo lattes
Format: Dissertação
Language:por
Programa: Pós-Graduação em Ciência e Engenharia de Materiais
Assuntos em Português:
YAG
Assuntos em Inglês:
Áreas de Conhecimento:
Online Access:https://ri.ufs.br/handle/riufs/3500
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spelling Santos, Daniel Felix Dias doshttp://lattes.cnpq.br/9710589741627606Valério, Mário Ernesto Giroldohttp://lattes.cnpq.br/65154497622063882017-09-26T12:01:55Z2017-09-26T12:01:55Z2013-08-30https://ri.ufs.br/handle/riufs/3500Optical and structural properties of nanopowders of Y3Al5O12 (YAG), Y3-xEuxAl5O12 (YAG:Eu) and Y3-xCexAl5O12 (YAG:Ce) (x=1 and 2mol%) were studied in the present work. The samples were synthesized via the Proteico Sol-Gel Process. X-ray diffraction showed that YAG single phase could be obtained after calcinations of the xerogels at 950°C/3h or 1050°C/2h. The scanning electron microscopy confirmed that at 950°C/3h the powders are formed by rods with a diameter of about 68 nm and 0.7 ìm in length. For the samples produced at 1050°C/2h two types of morphology were found consisting of needles with a diameter around 44 nm and 0.72 ìm in length, and rounded particles with an average diameter of 130 nm. The Energy-dispersive X-ray spectroscopy confirmed the presence of the dopants and showed that in all nanopowders there were impurities inherited from coconut water. The XANES results confirmed that the dopant ion was incorporated in YAG:Eu nanopowders, as Eu3+ and in the YAG:Ce nanopowders, the dopant was incorporated predominantly as Ce4+ ions. The radioluminescence emission spectra of YAG:Eu and YAG:Ce nanopowders were composed by the typical transitions characteristics of the Eu3+ and Ce3+ ions in the visible region. . Only the YAG:Eu nanopowders showed photoluminescence emission and the reason is that in the case of the Ce-doped YAG most part of the dopant is in its tetravalent charge state that is not optically active.. Nevertheless, the lifetime of the luminescent of the Ce-doped nanopowders were possible to obtain using monochromatic pulsed X-rays and the characteristic lifetime constant is around 48 ns.Neste trabalho foram estudadas as propriedades opticas e estruturais exibidas pelos nanopos de Y3Al5O12(YAG), Y3-xEuxAl5O12 (YAG:Eu) e Y3-xCexAl5O12(YAG:Ce), onde x=1 e 2mol%, sintetizados via o Processo Sol-Gel Proteico. A difratometria de raios X demonstrou que a fase unica YAG e formada nos pos apos calcinar os xerogeis precursores a 950 C/3h e 1050 C/2h. As analises por microscopia eletronica de varredura confirmaram que em 950 C/3h os pos sao formados por bastoes com diametro em torno de 68 nm e 0,7 Êm de comprimento, e em 1050 C/2h as amostras passam a apresentar dois tipos de morfologia constituida por agulhas com diametro em torno de 44 nm por 0,72 Êm de comprimento e particulas arredondadas com diametro em torno de 130 nm. A espectroscopia de raios X por dispersao de energia confirmou a presenca dos ions dopantes e demonstrou que em todos os nanopos ha impurezas herdadas da agua de coco. Os resultados de XANES confirmaram que o ion Eu3+ foi incorporado nos nanopos de YAG:Eu no estado de oxidacao trivalente e nos nanopos de YAG:Ce houve a incorporacao predominantemente de ions Ce4+. Medidas do espectro de emissao radioluminescente indicaram que nos nanopos de YAG:Eu e YAG:Ce aparecem as transicoes responsaveis pelas emissoes caracteristicas dos ions Eu3+ e Ce3+. Nas medidas de fotoluminescencia so foi possivel obter o espectro de emissao dos nanopos de YAG:Eu ja que na amostra dopada com Ce o estado de oxidacao predominante e o tetravalente. O tempo de vida da luminescente foi medida utilizando raios X monocromaticos e pulsado e, para os nanopos dopados com Ce, o tempo de vida caracteristico esta em torno de 48 ns.application/pdfporMateriaisLuminescênciaNanociênciaCompostos de ítrioGranada de ítrio e alumínioEngenharia de materiaisYAGNanopósProcesso sol-gel proteicoXANESMaterialsNanoscienceYttrium iron garnetCNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAEstudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteicoinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisPós-Graduação em Ciência e Engenharia de Materiaisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipeinstacron:UFSTEXTDANIEL_FELIX_DIAS_SANTOS.pdf.txtDANIEL_FELIX_DIAS_SANTOS.pdf.txtExtracted texttext/plain131765http://ri.ufs.br/jspui/bitstream/riufs/3500/2/DANIEL_FELIX_DIAS_SANTOS.pdf.txt6e7370ecf3c3fa8018d8f3d4b0fb8b3cMD52THUMBNAILDANIEL_FELIX_DIAS_SANTOS.pdf.jpgDANIEL_FELIX_DIAS_SANTOS.pdf.jpgGenerated Thumbnailimage/jpeg1235http://ri.ufs.br/jspui/bitstream/riufs/3500/3/DANIEL_FELIX_DIAS_SANTOS.pdf.jpgbc2c5ee029c2e69fcacd44432344d07cMD53ORIGINALDANIEL_FELIX_DIAS_SANTOS.pdfapplication/pdf3378521http://ri.ufs.br/jspui/bitstream/riufs/3500/1/DANIEL_FELIX_DIAS_SANTOS.pdf7413d8c4a0a3c72472224e1781c5f76cMD51riufs/3500oai:ri.ufs.br:riufs/35002017-11-27 21:28:33.179Repositório Institucional da Universidade Federal de Sergipe - RI/UFSrepositorio@ufs.br
dc.title.por.fl_str_mv Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico
title Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico
spellingShingle Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico
Santos, Daniel Felix Dias dos
Materiais
Luminescência
Nanociência
Compostos de ítrio
Granada de ítrio e alumínio
Engenharia de materiais
YAG
Nanopós
Processo sol-gel proteico
XANES
Materials
Nanoscience
Yttrium iron garnet
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
title_short Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico
title_full Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico
title_fullStr Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico
title_full_unstemmed Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico
title_sort Estudo óptico e estrutural de nanopós de Y3AI5O12 dopados com Eu3+ e Ce3+ sintetizados via processo sol-gel proteico
author Santos, Daniel Felix Dias dos
author_facet Santos, Daniel Felix Dias dos
author_role author
dc.contributor.author.fl_str_mv Santos, Daniel Felix Dias dos
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/9710589741627606
dc.contributor.advisor1.fl_str_mv Valério, Mário Ernesto Giroldo
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/6515449762206388
contributor_str_mv Valério, Mário Ernesto Giroldo
dc.subject.por.fl_str_mv Materiais
Luminescência
Nanociência
Compostos de ítrio
Granada de ítrio e alumínio
Engenharia de materiais
YAG
Nanopós
Processo sol-gel proteico
XANES
topic Materiais
Luminescência
Nanociência
Compostos de ítrio
Granada de ítrio e alumínio
Engenharia de materiais
YAG
Nanopós
Processo sol-gel proteico
XANES
Materials
Nanoscience
Yttrium iron garnet
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
dc.subject.eng.fl_str_mv Materials
Nanoscience
Yttrium iron garnet
dc.subject.cnpq.fl_str_mv CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
dc.description.abstract.eng.fl_txt_mv Optical and structural properties of nanopowders of Y3Al5O12 (YAG), Y3-xEuxAl5O12 (YAG:Eu) and Y3-xCexAl5O12 (YAG:Ce) (x=1 and 2mol%) were studied in the present work. The samples were synthesized via the Proteico Sol-Gel Process. X-ray diffraction showed that YAG single phase could be obtained after calcinations of the xerogels at 950°C/3h or 1050°C/2h. The scanning electron microscopy confirmed that at 950°C/3h the powders are formed by rods with a diameter of about 68 nm and 0.7 ìm in length. For the samples produced at 1050°C/2h two types of morphology were found consisting of needles with a diameter around 44 nm and 0.72 ìm in length, and rounded particles with an average diameter of 130 nm. The Energy-dispersive X-ray spectroscopy confirmed the presence of the dopants and showed that in all nanopowders there were impurities inherited from coconut water. The XANES results confirmed that the dopant ion was incorporated in YAG:Eu nanopowders, as Eu3+ and in the YAG:Ce nanopowders, the dopant was incorporated predominantly as Ce4+ ions. The radioluminescence emission spectra of YAG:Eu and YAG:Ce nanopowders were composed by the typical transitions characteristics of the Eu3+ and Ce3+ ions in the visible region. . Only the YAG:Eu nanopowders showed photoluminescence emission and the reason is that in the case of the Ce-doped YAG most part of the dopant is in its tetravalent charge state that is not optically active.. Nevertheless, the lifetime of the luminescent of the Ce-doped nanopowders were possible to obtain using monochromatic pulsed X-rays and the characteristic lifetime constant is around 48 ns.
dc.description.abstract.por.fl_txt_mv Neste trabalho foram estudadas as propriedades opticas e estruturais exibidas pelos nanopos de Y3Al5O12(YAG), Y3-xEuxAl5O12 (YAG:Eu) e Y3-xCexAl5O12(YAG:Ce), onde x=1 e 2mol%, sintetizados via o Processo Sol-Gel Proteico. A difratometria de raios X demonstrou que a fase unica YAG e formada nos pos apos calcinar os xerogeis precursores a 950 C/3h e 1050 C/2h. As analises por microscopia eletronica de varredura confirmaram que em 950 C/3h os pos sao formados por bastoes com diametro em torno de 68 nm e 0,7 Êm de comprimento, e em 1050 C/2h as amostras passam a apresentar dois tipos de morfologia constituida por agulhas com diametro em torno de 44 nm por 0,72 Êm de comprimento e particulas arredondadas com diametro em torno de 130 nm. A espectroscopia de raios X por dispersao de energia confirmou a presenca dos ions dopantes e demonstrou que em todos os nanopos ha impurezas herdadas da agua de coco. Os resultados de XANES confirmaram que o ion Eu3+ foi incorporado nos nanopos de YAG:Eu no estado de oxidacao trivalente e nos nanopos de YAG:Ce houve a incorporacao predominantemente de ions Ce4+. Medidas do espectro de emissao radioluminescente indicaram que nos nanopos de YAG:Eu e YAG:Ce aparecem as transicoes responsaveis pelas emissoes caracteristicas dos ions Eu3+ e Ce3+. Nas medidas de fotoluminescencia so foi possivel obter o espectro de emissao dos nanopos de YAG:Eu ja que na amostra dopada com Ce o estado de oxidacao predominante e o tetravalente. O tempo de vida da luminescente foi medida utilizando raios X monocromaticos e pulsado e, para os nanopos dopados com Ce, o tempo de vida caracteristico esta em torno de 48 ns.
description Optical and structural properties of nanopowders of Y3Al5O12 (YAG), Y3-xEuxAl5O12 (YAG:Eu) and Y3-xCexAl5O12 (YAG:Ce) (x=1 and 2mol%) were studied in the present work. The samples were synthesized via the Proteico Sol-Gel Process. X-ray diffraction showed that YAG single phase could be obtained after calcinations of the xerogels at 950°C/3h or 1050°C/2h. The scanning electron microscopy confirmed that at 950°C/3h the powders are formed by rods with a diameter of about 68 nm and 0.7 ìm in length. For the samples produced at 1050°C/2h two types of morphology were found consisting of needles with a diameter around 44 nm and 0.72 ìm in length, and rounded particles with an average diameter of 130 nm. The Energy-dispersive X-ray spectroscopy confirmed the presence of the dopants and showed that in all nanopowders there were impurities inherited from coconut water. The XANES results confirmed that the dopant ion was incorporated in YAG:Eu nanopowders, as Eu3+ and in the YAG:Ce nanopowders, the dopant was incorporated predominantly as Ce4+ ions. The radioluminescence emission spectra of YAG:Eu and YAG:Ce nanopowders were composed by the typical transitions characteristics of the Eu3+ and Ce3+ ions in the visible region. . Only the YAG:Eu nanopowders showed photoluminescence emission and the reason is that in the case of the Ce-doped YAG most part of the dopant is in its tetravalent charge state that is not optically active.. Nevertheless, the lifetime of the luminescent of the Ce-doped nanopowders were possible to obtain using monochromatic pulsed X-rays and the characteristic lifetime constant is around 48 ns.
publishDate 2013
dc.date.issued.fl_str_mv 2013-08-30
dc.date.accessioned.fl_str_mv 2017-09-26T12:01:55Z
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