Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/4390 |
Resumo: | In this work the structural and optical properties of SiO2-ZnO-TiO2 system doped with of Eu3+ (1% in mol) or Er3+ ions (0,2% to 2,0% in mol) were investigated. The compositions xSiO2-([100-x]/2)ZnO-([100-x]/2)TiO2 with x ranging from 40 to 80 were synthesized and studied. A mixed methodology using the traditional sol-gel process and Pechini method was employed to prepare stable and transparent sols, homogeneous gels, powders and transparent thin films without cracks. The prepared powders were heat treated from 100°C to 1100°C. The optical “band gap” values, the lifetime of Eu3+ 5D0 level, the R/O ratio of Eu3+ emissions and refractive index are dependent on the composition and thermal treatment of the powders. Multilayered thin films were deposited onto silica substrates using the “spin coating” technique. Afterwards, the as-prepared thin films were calcined at 500°C followed by annealings from 700°C to 1000°C. The X-ray diffraction of powders showed that the crystallization starts at 800°C with a mixture of zinc titanate phases (ZnTiO3, Zn2TiO4) and titanium rutile (TiO2). In compositions with low silica content (x = 40 or 50) the formation of zinc silicate (Zn2SiO4) occurs at high temperatures. The optical properties were evaluated for both powders and thin films. Particularly, thin films exhibit transmittance above 80% in the visible region. The refractive index at 632.8 nm and thickness of thin films were estimated using the envelope method and m-Line spectrocopy. Furthermore, morphological analysis of the thin films surface was performed by scanning electron microscopy. The characteristic emission peaks of Er3+ or Eu3+ doped powders and thin films were measured. The photoluminescent emission of Eu3+ ions, obtained the highest intensities for the powders treated at 800°C, for films treated at 700°C, under excitation at 394 nm, where the system remains primarily amorphous. The photoluminescent emission of the Er3+ ions was more intense for the powders treated at 1100°C under excitation at 980 nm, mainly due to reduction of hydroxyl groups which act as photoluminescence quenchers. In the film the highest intensity occurred at a temperature of 700°C under excitation at 378 nm and showing only one guided mode. Thus, the obtained thin films can be suitable for application as waveguides in integrated optical systems. Moreover, the Eu and Er doped powders can be used as phosphors in displays. |
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Nunes, Liliane Magalhãeshttp://lattes.cnpq.br/6591210839894513Maia, Lauro June de QueirozNunes, Liliane MagalhãesMaia, Lauro June de QueirozCaires, Anderson Rodrigues LimaBernardez, Andréa Simone Stucchi de Camargo A.Santana, Ricardo Costa dehttp://lattes.cnpq.br/9420350858332796Fógia, Michelly Patrícia Santana de Almeida2015-03-30T15:36:48Z2014-09-24ALMEIDA, Michelly Patrícia Santana de. Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini. 2014. 162 f. Tese (Doutorado em Química) - Universidade Federal de Goiás, Goiânia, 2014.http://repositorio.bc.ufg.br/tede/handle/tede/4390ark:/38995/0013000001jnrIn this work the structural and optical properties of SiO2-ZnO-TiO2 system doped with of Eu3+ (1% in mol) or Er3+ ions (0,2% to 2,0% in mol) were investigated. The compositions xSiO2-([100-x]/2)ZnO-([100-x]/2)TiO2 with x ranging from 40 to 80 were synthesized and studied. A mixed methodology using the traditional sol-gel process and Pechini method was employed to prepare stable and transparent sols, homogeneous gels, powders and transparent thin films without cracks. The prepared powders were heat treated from 100°C to 1100°C. The optical “band gap” values, the lifetime of Eu3+ 5D0 level, the R/O ratio of Eu3+ emissions and refractive index are dependent on the composition and thermal treatment of the powders. Multilayered thin films were deposited onto silica substrates using the “spin coating” technique. Afterwards, the as-prepared thin films were calcined at 500°C followed by annealings from 700°C to 1000°C. The X-ray diffraction of powders showed that the crystallization starts at 800°C with a mixture of zinc titanate phases (ZnTiO3, Zn2TiO4) and titanium rutile (TiO2). In compositions with low silica content (x = 40 or 50) the formation of zinc silicate (Zn2SiO4) occurs at high temperatures. The optical properties were evaluated for both powders and thin films. Particularly, thin films exhibit transmittance above 80% in the visible region. The refractive index at 632.8 nm and thickness of thin films were estimated using the envelope method and m-Line spectrocopy. Furthermore, morphological analysis of the thin films surface was performed by scanning electron microscopy. The characteristic emission peaks of Er3+ or Eu3+ doped powders and thin films were measured. The photoluminescent emission of Eu3+ ions, obtained the highest intensities for the powders treated at 800°C, for films treated at 700°C, under excitation at 394 nm, where the system remains primarily amorphous. The photoluminescent emission of the Er3+ ions was more intense for the powders treated at 1100°C under excitation at 980 nm, mainly due to reduction of hydroxyl groups which act as photoluminescence quenchers. In the film the highest intensity occurred at a temperature of 700°C under excitation at 378 nm and showing only one guided mode. Thus, the obtained thin films can be suitable for application as waveguides in integrated optical systems. Moreover, the Eu and Er doped powders can be used as phosphors in displays.Este trabalho avalia as propriedades estruturais e ópticas do sistema ternário SiO2-ZnO-TiO2 dopado com íons Eu3+ (1% em mol) ou Er3+ (0,2% a 2,0% em mol). As composições xSiO2-([100-x]/2)ZnO-([100-x]/2)TiO2, com x = 40, 50, 60, 70 e 80 foram estudadas. Através de metodologia mista do processo sol-gel com o método Pechini foi possível obter sóis estáveis e transparentes, géis homogêneos, pós tratados termicamente de 100ºC a 1100°C e filmes finos transparentes e sem trincas. Filmes finos multicamadas foram depositados sobre substratos de sílica usando “spin coating” e calcinados a 500°C, seguido de um tratamento térmico entre 700°C e 1000°C. Por fotoluminescência foram observadas as transições de emissão características de íons Er3+ e Eu3+. A caracterização por difração de raios X dos pós mostrou que a cristalização tem início a partir de 800°C, com uma mistura de fases de titanatos de zinco (ZnTiO3, Zn2TiO4) e segregação de titânio rutilo (TiO2). Em composições com menores proporções de sílica (x= 40 ou 50) também ocorreu a formação de silicato de zinco (Zn2SiO4) em temperaturas mais elevadas. Os espectros de transmissão dos filmes apresentaram transmitância superior a 80%. Os valores de “band gap” óptico, o tempo de vida, as razões R/O e o índice de refração são dependentes do tratamento térmico e da composição dos pós. Usando o método da envoltória, pôde-se calcular o índice de refração a 632,8 nm e a espessura dos filmes finos, sendo que esta também foi estimada por microscopia eletrônica de varredura (MEV) e espectroscopia m-Line. A emissão fotoluminescente dos íons Eu3+ tem maior intensidade nos pós tratados à 800°C e nos filmes tratados à 700°C, sob excitação a 394 nm. Nestas temperaturas o sistema permanece predominantemente amorfo. A emissão fotoluminescente dos íons Er3+ foi mais intensa para os pós tratados a 1100°C, sob excitação a 980 nm, devido à eliminação de grupos OH supressores das emissões de Er3+. Nos filmes a maior intensidade se deu à temperatura de 700°C, sob excitação a 378 nm. Os filmes apresentaram apenas um modo guiado, sendo o mais apropriado para uso como guia de onda e os pós são indicados como fósforos podendo ser aplicados em “displays".Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2015-03-30T13:38:33Z No. of bitstreams: 3 1_pdfsam_Tese - Michelly Patrícia Santana de Almeida Fógia - 2014 - (1).pdf: 19290836 bytes, checksum: 2968ddb5cb0f3df6082b9b4716172cff (MD5) 109_pdfsam_Tese - Michelly Patrícia Santana de Almeida Fógia - 2014 - (2).pdf: 5395221 bytes, checksum: 4db4ad13c96adee2667748bc5321c48f (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-03-30T15:36:48Z (GMT) No. of bitstreams: 3 1_pdfsam_Tese - Michelly Patrícia Santana de Almeida Fógia - 2014 - (1).pdf: 19290836 bytes, checksum: 2968ddb5cb0f3df6082b9b4716172cff (MD5) 109_pdfsam_Tese - Michelly Patrícia Santana de Almeida Fógia - 2014 - (2).pdf: 5395221 bytes, checksum: 4db4ad13c96adee2667748bc5321c48f (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)Made available in DSpace on 2015-03-30T15:36:48Z (GMT). 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dc.title.por.fl_str_mv |
Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini |
dc.title.alternative.eng.fl_str_mv |
Synthesis and characterization of materials from SiO2-ZnOTiO2 ternary system obtained by sol-gel/Pechini |
title |
Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini |
spellingShingle |
Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini Fógia, Michelly Patrícia Santana de Almeida Sistema SiO2-ZnO-TiO2 Titanatos de zinco Silicatos de zinco Dopagem com Eu3+ e Er3+ Filmes finos Luminescência e propriedades ópticas SiO2-ZnO-TiO2 system Zinc titanate Zinc silicate Eu3+ and Er3+ dopings Thin films Luminescence and optical properties CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini |
title_full |
Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini |
title_fullStr |
Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini |
title_full_unstemmed |
Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini |
title_sort |
Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini |
author |
Fógia, Michelly Patrícia Santana de Almeida |
author_facet |
Fógia, Michelly Patrícia Santana de Almeida |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Nunes, Liliane Magalhães |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/6591210839894513 |
dc.contributor.advisor-co1.fl_str_mv |
Maia, Lauro June de Queiroz |
dc.contributor.referee1.fl_str_mv |
Nunes, Liliane Magalhães |
dc.contributor.referee2.fl_str_mv |
Maia, Lauro June de Queiroz |
dc.contributor.referee3.fl_str_mv |
Caires, Anderson Rodrigues Lima |
dc.contributor.referee4.fl_str_mv |
Bernardez, Andréa Simone Stucchi de Camargo A. |
dc.contributor.referee5.fl_str_mv |
Santana, Ricardo Costa de |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/9420350858332796 |
dc.contributor.author.fl_str_mv |
Fógia, Michelly Patrícia Santana de Almeida |
contributor_str_mv |
Nunes, Liliane Magalhães Maia, Lauro June de Queiroz Nunes, Liliane Magalhães Maia, Lauro June de Queiroz Caires, Anderson Rodrigues Lima Bernardez, Andréa Simone Stucchi de Camargo A. Santana, Ricardo Costa de |
dc.subject.por.fl_str_mv |
Sistema SiO2-ZnO-TiO2 Titanatos de zinco Silicatos de zinco Dopagem com Eu3+ e Er3+ Filmes finos Luminescência e propriedades ópticas |
topic |
Sistema SiO2-ZnO-TiO2 Titanatos de zinco Silicatos de zinco Dopagem com Eu3+ e Er3+ Filmes finos Luminescência e propriedades ópticas SiO2-ZnO-TiO2 system Zinc titanate Zinc silicate Eu3+ and Er3+ dopings Thin films Luminescence and optical properties CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
SiO2-ZnO-TiO2 system Zinc titanate Zinc silicate Eu3+ and Er3+ dopings Thin films Luminescence and optical properties |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
In this work the structural and optical properties of SiO2-ZnO-TiO2 system doped with of Eu3+ (1% in mol) or Er3+ ions (0,2% to 2,0% in mol) were investigated. The compositions xSiO2-([100-x]/2)ZnO-([100-x]/2)TiO2 with x ranging from 40 to 80 were synthesized and studied. A mixed methodology using the traditional sol-gel process and Pechini method was employed to prepare stable and transparent sols, homogeneous gels, powders and transparent thin films without cracks. The prepared powders were heat treated from 100°C to 1100°C. The optical “band gap” values, the lifetime of Eu3+ 5D0 level, the R/O ratio of Eu3+ emissions and refractive index are dependent on the composition and thermal treatment of the powders. Multilayered thin films were deposited onto silica substrates using the “spin coating” technique. Afterwards, the as-prepared thin films were calcined at 500°C followed by annealings from 700°C to 1000°C. The X-ray diffraction of powders showed that the crystallization starts at 800°C with a mixture of zinc titanate phases (ZnTiO3, Zn2TiO4) and titanium rutile (TiO2). In compositions with low silica content (x = 40 or 50) the formation of zinc silicate (Zn2SiO4) occurs at high temperatures. The optical properties were evaluated for both powders and thin films. Particularly, thin films exhibit transmittance above 80% in the visible region. The refractive index at 632.8 nm and thickness of thin films were estimated using the envelope method and m-Line spectrocopy. Furthermore, morphological analysis of the thin films surface was performed by scanning electron microscopy. The characteristic emission peaks of Er3+ or Eu3+ doped powders and thin films were measured. The photoluminescent emission of Eu3+ ions, obtained the highest intensities for the powders treated at 800°C, for films treated at 700°C, under excitation at 394 nm, where the system remains primarily amorphous. The photoluminescent emission of the Er3+ ions was more intense for the powders treated at 1100°C under excitation at 980 nm, mainly due to reduction of hydroxyl groups which act as photoluminescence quenchers. In the film the highest intensity occurred at a temperature of 700°C under excitation at 378 nm and showing only one guided mode. Thus, the obtained thin films can be suitable for application as waveguides in integrated optical systems. Moreover, the Eu and Er doped powders can be used as phosphors in displays. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014-09-24 |
dc.date.accessioned.fl_str_mv |
2015-03-30T15:36:48Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
ALMEIDA, Michelly Patrícia Santana de. Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini. 2014. 162 f. Tese (Doutorado em Química) - Universidade Federal de Goiás, Goiânia, 2014. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/4390 |
dc.identifier.dark.fl_str_mv |
ark:/38995/0013000001jnr |
identifier_str_mv |
ALMEIDA, Michelly Patrícia Santana de. Síntese e caracterização de materiais do sistema ternário SiO2-ZnO-TiO2 obtido por sol-gel/Pechini. 2014. 162 f. Tese (Doutorado em Química) - Universidade Federal de Goiás, Goiânia, 2014. ark:/38995/0013000001jnr |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/4390 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
663693921325415158 |
dc.relation.confidence.fl_str_mv |
600 600 600 |
dc.relation.department.fl_str_mv |
7826066743741197278 |
dc.relation.cnpq.fl_str_mv |
1571700325303117195 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Química (IQ) |
dc.publisher.initials.fl_str_mv |
UFG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Instituto de Química - IQ (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFG instname:Universidade Federal de Goiás (UFG) instacron:UFG |
instname_str |
Universidade Federal de Goiás (UFG) |
instacron_str |
UFG |
institution |
UFG |
reponame_str |
Repositório Institucional da UFG |
collection |
Repositório Institucional da UFG |
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tasesdissertacoes.bc@ufg.br |
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