Obtenção e caracterização elétrica de filmes finos de SnO2:Sb
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/876 |
Resumo: | The growing demand for advanced electronic devices based on nanomaterials has motivated efforts to produce nanoscale building blocks with designed functions. Transparent conducting oxide nanocrystals (TCONs) are particularly promising for the development of such devices. TCONs synthesized in an organic medium play an important role as building blocks because nonaqueous processes allow for greater control of the reaction pathways on a molecular level, enabling the synthesis of nanomaterials with high crystallinity and well-defined and uniform particle morphologies. This work describes the synthesis of highly conducting antimony-doped tin oxide (ATO) nanocrystals prepared via a nonaqueous sol-gel route in the size range of 4-7 nm, as well as insights into its electrical properties when processed as pellet and thin films. The antimony composition was varied from 1 to 18 mol% and the lowest resistivity (4.0x10-4 Ωcm) was observed at room temperature in the SnO2:8.8%molSb composition. The samples were evaluated by XRD, HRTEM, EDX, and SEM, resistivity measurements were taken in the four-probe mode in the temperature range of 77-300K and Hall-effect measurements were taken at room temperature. The preparation of crystalline ATO nanoparticles fully redispersible in organic solvents consists in one pot reaction under solvothermal treatment of tin (IV) chloride and antimony (III) chloride in benzyl alcohol at 150°C for 48h. The ATO nanocrystals were collected by centrifugation and washed twice with THF. The pellets were prepared by pressing 200mg of ATO nanoparticles under 4 MPa into a rigid die in a single axial direction through a rigid punch and the thin films produced via dip-coating deposition on quartz substrate. The results show highly crystalline nanoparticles in a monodisperse colloidal system, dependence on the shape of ATO nanoparticles as a function of Sb distribution and low resistivity. |
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Conti, Tiago de GóesLeite, Edson Robertohttp://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783657E4http://lattes.cnpq.br/20913517419822514d3d74f4-d9a5-44e5-8d35-458f80a9dfc42016-06-02T19:12:22Z2012-10-022016-06-02T19:12:22Z2011-03-03CONTI, Tiago de Góes. Deposition and electrical properties of sno2:sb films abstract. 2011. 94 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2011.https://repositorio.ufscar.br/handle/ufscar/876The growing demand for advanced electronic devices based on nanomaterials has motivated efforts to produce nanoscale building blocks with designed functions. Transparent conducting oxide nanocrystals (TCONs) are particularly promising for the development of such devices. TCONs synthesized in an organic medium play an important role as building blocks because nonaqueous processes allow for greater control of the reaction pathways on a molecular level, enabling the synthesis of nanomaterials with high crystallinity and well-defined and uniform particle morphologies. This work describes the synthesis of highly conducting antimony-doped tin oxide (ATO) nanocrystals prepared via a nonaqueous sol-gel route in the size range of 4-7 nm, as well as insights into its electrical properties when processed as pellet and thin films. The antimony composition was varied from 1 to 18 mol% and the lowest resistivity (4.0x10-4 Ωcm) was observed at room temperature in the SnO2:8.8%molSb composition. The samples were evaluated by XRD, HRTEM, EDX, and SEM, resistivity measurements were taken in the four-probe mode in the temperature range of 77-300K and Hall-effect measurements were taken at room temperature. The preparation of crystalline ATO nanoparticles fully redispersible in organic solvents consists in one pot reaction under solvothermal treatment of tin (IV) chloride and antimony (III) chloride in benzyl alcohol at 150°C for 48h. The ATO nanocrystals were collected by centrifugation and washed twice with THF. The pellets were prepared by pressing 200mg of ATO nanoparticles under 4 MPa into a rigid die in a single axial direction through a rigid punch and the thin films produced via dip-coating deposition on quartz substrate. The results show highly crystalline nanoparticles in a monodisperse colloidal system, dependence on the shape of ATO nanoparticles as a function of Sb distribution and low resistivity.A crescente demanda por dispositivos eletrônicos avançados baseados em nanomateriais tem motivado esforços para produção de blocos de construção com funções específicas. Nanocristais de Óxidos Condutores Transparentes (TCONs) são promissores para o desenvolvimento de displays de alta resolução, células fotovoltaicas, telas sensíveis ao toque, etc. TCONs sintetizados em meio orgânico são muito importantes como blocos de construção, pois processos não aquosos possibilitam excelente controle dos caminhos reacionais a nível molecular, permitem a síntese de nanomateriais com alta cristalinidade e com morfologias uniformes e bem definidas. Este trabalho descreve a síntese de nanopartículas altamente cristalinas de dióxido de estanho dopado com antimônio (ATO) preparados via rota sol-gel não aquosa com tamanhos variando entre 4-7 nm, assim como, estudos de suas propriedades elétricas quando processados como pastilhas e filmes finos. A composição do antimônio foi variada de 1 a 18% mol e o menor valor de resistividade a temperatura ambiente foi observado nas amostras com ~8,8%mol de Sb (4,0x10-4 Ωcm). As amostras foram estudadas por difração de raios-X (DRX), microscopia eletrônica de transmissão em alta resolução (HRTEM), microscopia eletrônica de varredura (FEG-SEM), espectroscopia de energia dispersiva de raios-X (EDX), medidas de resistividade foram feita utilizando-se o método da sonda quatro pontas entre 77 e 300K e medidas de efeito Hall foram feitas a temperatura ambiente. A preparação das nanopartículas altamente cristalinas de ATO em sistema coloidal monodisperso completamente re-dispersiveis em solventes orgânicos consiste do tratamento solvotermal do cloreto de estanho (IV) com cloreto de antimônio (III) em álcool benzílico a 150 °C por 48 horas. Os nanocristais de ATO foram coletados por centrifugação e lavados duas vezes com tetrahidrofurano (THF). As pastilhas foram preparadas por prensagem uniaxial de 200mg de ATO em pó (seco) em um molde rígido sob 4 MPa e os filmes finos foram obtidos por dip-coating em substratos de quartzo amorfo. Os resultados de caracterização de transporte eletrônico permitem inferir que o material apresenta baixa resistividade, da ordem de 10-3 _.cm à temperatura ambiente.application/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBREngenharia de materiaisSol-gel métodoNanopartículasFilmes finosMedidas elétricasENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAObtenção e caracterização elétrica de filmes finos de SnO2:SbDeposition and electrical properties of sno2:sb films abstractinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-19c25e6a7-a2cd-4058-97ed-441bc2793123info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL4553.pdfapplication/pdf5605297https://repositorio.ufscar.br/bitstream/ufscar/876/1/4553.pdf40998e25cf62582e60472d429440f99eMD51TEXT4553.pdf.txt4553.pdf.txtExtracted texttext/plain0https://repositorio.ufscar.br/bitstream/ufscar/876/2/4553.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL4553.pdf.jpg4553.pdf.jpgIM Thumbnailimage/jpeg6240https://repositorio.ufscar.br/bitstream/ufscar/876/3/4553.pdf.jpg8494063eda12f34285bb79aefe9ea209MD53ufscar/8762023-09-18 18:31:28.143oai:repositorio.ufscar.br:ufscar/876Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:28Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Obtenção e caracterização elétrica de filmes finos de SnO2:Sb |
dc.title.alternative.eng.fl_str_mv |
Deposition and electrical properties of sno2:sb films abstract |
title |
Obtenção e caracterização elétrica de filmes finos de SnO2:Sb |
spellingShingle |
Obtenção e caracterização elétrica de filmes finos de SnO2:Sb Conti, Tiago de Góes Engenharia de materiais Sol-gel método Nanopartículas Filmes finos Medidas elétricas ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Obtenção e caracterização elétrica de filmes finos de SnO2:Sb |
title_full |
Obtenção e caracterização elétrica de filmes finos de SnO2:Sb |
title_fullStr |
Obtenção e caracterização elétrica de filmes finos de SnO2:Sb |
title_full_unstemmed |
Obtenção e caracterização elétrica de filmes finos de SnO2:Sb |
title_sort |
Obtenção e caracterização elétrica de filmes finos de SnO2:Sb |
author |
Conti, Tiago de Góes |
author_facet |
Conti, Tiago de Góes |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/2091351741982251 |
dc.contributor.author.fl_str_mv |
Conti, Tiago de Góes |
dc.contributor.advisor1.fl_str_mv |
Leite, Edson Roberto |
dc.contributor.advisor1Lattes.fl_str_mv |
http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783657E4 |
dc.contributor.authorID.fl_str_mv |
4d3d74f4-d9a5-44e5-8d35-458f80a9dfc4 |
contributor_str_mv |
Leite, Edson Roberto |
dc.subject.por.fl_str_mv |
Engenharia de materiais Sol-gel método Nanopartículas Filmes finos Medidas elétricas |
topic |
Engenharia de materiais Sol-gel método Nanopartículas Filmes finos Medidas elétricas ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
The growing demand for advanced electronic devices based on nanomaterials has motivated efforts to produce nanoscale building blocks with designed functions. Transparent conducting oxide nanocrystals (TCONs) are particularly promising for the development of such devices. TCONs synthesized in an organic medium play an important role as building blocks because nonaqueous processes allow for greater control of the reaction pathways on a molecular level, enabling the synthesis of nanomaterials with high crystallinity and well-defined and uniform particle morphologies. This work describes the synthesis of highly conducting antimony-doped tin oxide (ATO) nanocrystals prepared via a nonaqueous sol-gel route in the size range of 4-7 nm, as well as insights into its electrical properties when processed as pellet and thin films. The antimony composition was varied from 1 to 18 mol% and the lowest resistivity (4.0x10-4 Ωcm) was observed at room temperature in the SnO2:8.8%molSb composition. The samples were evaluated by XRD, HRTEM, EDX, and SEM, resistivity measurements were taken in the four-probe mode in the temperature range of 77-300K and Hall-effect measurements were taken at room temperature. The preparation of crystalline ATO nanoparticles fully redispersible in organic solvents consists in one pot reaction under solvothermal treatment of tin (IV) chloride and antimony (III) chloride in benzyl alcohol at 150°C for 48h. The ATO nanocrystals were collected by centrifugation and washed twice with THF. The pellets were prepared by pressing 200mg of ATO nanoparticles under 4 MPa into a rigid die in a single axial direction through a rigid punch and the thin films produced via dip-coating deposition on quartz substrate. The results show highly crystalline nanoparticles in a monodisperse colloidal system, dependence on the shape of ATO nanoparticles as a function of Sb distribution and low resistivity. |
publishDate |
2011 |
dc.date.issued.fl_str_mv |
2011-03-03 |
dc.date.available.fl_str_mv |
2012-10-02 2016-06-02T19:12:22Z |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:12:22Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
CONTI, Tiago de Góes. Deposition and electrical properties of sno2:sb films abstract. 2011. 94 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2011. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/876 |
identifier_str_mv |
CONTI, Tiago de Góes. Deposition and electrical properties of sno2:sb films abstract. 2011. 94 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2011. |
url |
https://repositorio.ufscar.br/handle/ufscar/876 |
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openAccess |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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Universidade Federal de São Carlos |
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