Metal sulfides: photoluminescence and photocatalytic properties

Detalhes bibliográficos
Ano de defesa: 2013
Autor(a) principal: Ratmann, Cristiane Wienke Raubach
Orientador(a): Silva, Elson Longo da lattes
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de São Carlos
Programa de Pós-Graduação: Programa de Pós-Graduação em Química - PPGQ
Departamento: Não Informado pela instituição
País: BR
Palavras-chave em Português:
Fotocatálise
Sulfetos
Microondas
Fotoluminescência
Área do conhecimento CNPq:
CIENCIAS EXATAS E DA TERRA::QUIMICA
Link de acesso: https://repositorio.ufscar.br/handle/ufscar/6279
Resumo: In this work we report an experimental and theoretical study of photoluminescence (PL) and photocatalytic activity of pure metal sulfides and systems furnished prepared by microwave assisted solvothermal (MAS) method. The theoretical model of the decorated system was created in order to analyze the electronic transition, especially in their interfaces. The results show that the system interface decorated (core-shell) produces an electron charge transfer of holes from cadmium sulfide (CdS) to zinc sulfide (ZnS), which helps increase the PL and photocatalytic activity of the system. For the pure systems, was observed the efficacy of the method synthesis employed verified that the process for obtaining the ZnS and calcium sulfide (CaS) was extremely important. Through the theoretical models was possible to evaluate the influence caused by the solvothermal influence caused by the MAS method. The variation in the synthesis parameters shows a direct influence on the PL properties of sulfides obtained which can be attributed to structural organization. The theoretical results how this order and disorder of the system can affect these properties of the obtained materials.
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spelling Ratmann, Cristiane Wienke RaubachSilva, Elson Longo dahttp://lattes.cnpq.br/9848311210578810http://lattes.cnpq.br/95809261012292392016-06-02T20:34:46Z2013-09-122016-06-02T20:34:46Z2013-08-30https://repositorio.ufscar.br/handle/ufscar/6279In this work we report an experimental and theoretical study of photoluminescence (PL) and photocatalytic activity of pure metal sulfides and systems furnished prepared by microwave assisted solvothermal (MAS) method. The theoretical model of the decorated system was created in order to analyze the electronic transition, especially in their interfaces. The results show that the system interface decorated (core-shell) produces an electron charge transfer of holes from cadmium sulfide (CdS) to zinc sulfide (ZnS), which helps increase the PL and photocatalytic activity of the system. For the pure systems, was observed the efficacy of the method synthesis employed verified that the process for obtaining the ZnS and calcium sulfide (CaS) was extremely important. Through the theoretical models was possible to evaluate the influence caused by the solvothermal influence caused by the MAS method. The variation in the synthesis parameters shows a direct influence on the PL properties of sulfides obtained which can be attributed to structural organization. The theoretical results how this order and disorder of the system can affect these properties of the obtained materials.Neste trabalho relata-se um estudo teórico e experimental da atividade fotoluminescente (FL) e fotocatalítica de sulfetos metálicos puros e em sistemas decorados preparados por intermédio do método solvotérmico assistido por micro-ondas. O modelo teórico do sistema decorado foi criado de forma a analisar a transição eletrônica, principalmente nas suas interfaces. Os resultados mostram que a interface do sistema decorado (core-shell) produz uma transferência de carga do elétron do sulfeto de cádmio (CdS) para os buracos do sulfeto de zinco (ZnS), o que ajuda a aumentar a atividade fotoluminescente e fotocatalítica do sistema. Para os sistemas puros, observou-se a eficácia do método de síntese empregado, sendo verificado que o processo de obtenção do ZnS e sulfeto de cálcio (CaS) foi de extrema importância. Por intermédio dos modelos teóricos foi possível avaliar a influência causada pelo método. A variação nos parâmetros de síntese mostra uma influência direta nas propriedades FL dos sulfetos obtidos que pode ser atribuída a organização estrutural. O modelo teórico mostra como essa ordem e desordem do sistema podem afetar essas propriedades dos materiais obtidos.Universidade Federal de Minas Geraisapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Química - PPGQUFSCarBRFotocatáliseSulfetosMicroondasFotoluminescênciaCIENCIAS EXATAS E DA TERRA::QUIMICAMetal sulfides: photoluminescence and photocatalytic propertiesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL5401.pdfapplication/pdf5113907https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/6279/1/5401.pdfbc63a1e068663b50eac2b2108398f3f0MD51TEXT5401.pdf.txt5401.pdf.txtExtracted texttext/plain0https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/6279/4/5401.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD54THUMBNAIL5401.pdf.jpg5401.pdf.jpgIM Thumbnailimage/jpeg6150https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/6279/5/5401.pdf.jpg8bc63ed5d2c5c510f4c469bfb79c1e51MD55ufscar/62792020-03-23 19:44:56.908oai:repositorio.ufscar.br:ufscar/6279Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-05-25T12:51:04.800009Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false
dc.title.por.fl_str_mv Metal sulfides: photoluminescence and photocatalytic properties
title Metal sulfides: photoluminescence and photocatalytic properties
spellingShingle Metal sulfides: photoluminescence and photocatalytic properties
Ratmann, Cristiane Wienke Raubach
Fotocatálise
Sulfetos
Microondas
Fotoluminescência
CIENCIAS EXATAS E DA TERRA::QUIMICA
title_short Metal sulfides: photoluminescence and photocatalytic properties
title_full Metal sulfides: photoluminescence and photocatalytic properties
title_fullStr Metal sulfides: photoluminescence and photocatalytic properties
title_full_unstemmed Metal sulfides: photoluminescence and photocatalytic properties
title_sort Metal sulfides: photoluminescence and photocatalytic properties
author Ratmann, Cristiane Wienke Raubach
author_facet Ratmann, Cristiane Wienke Raubach
author_role author
dc.contributor.authorlattes.por.fl_str_mv http://lattes.cnpq.br/9580926101229239
dc.contributor.author.fl_str_mv Ratmann, Cristiane Wienke Raubach
dc.contributor.advisor1.fl_str_mv Silva, Elson Longo da
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/9848311210578810
contributor_str_mv Silva, Elson Longo da
dc.subject.por.fl_str_mv Fotocatálise
Sulfetos
Microondas
Fotoluminescência
topic Fotocatálise
Sulfetos
Microondas
Fotoluminescência
CIENCIAS EXATAS E DA TERRA::QUIMICA
dc.subject.cnpq.fl_str_mv CIENCIAS EXATAS E DA TERRA::QUIMICA
description In this work we report an experimental and theoretical study of photoluminescence (PL) and photocatalytic activity of pure metal sulfides and systems furnished prepared by microwave assisted solvothermal (MAS) method. The theoretical model of the decorated system was created in order to analyze the electronic transition, especially in their interfaces. The results show that the system interface decorated (core-shell) produces an electron charge transfer of holes from cadmium sulfide (CdS) to zinc sulfide (ZnS), which helps increase the PL and photocatalytic activity of the system. For the pure systems, was observed the efficacy of the method synthesis employed verified that the process for obtaining the ZnS and calcium sulfide (CaS) was extremely important. Through the theoretical models was possible to evaluate the influence caused by the solvothermal influence caused by the MAS method. The variation in the synthesis parameters shows a direct influence on the PL properties of sulfides obtained which can be attributed to structural organization. The theoretical results how this order and disorder of the system can affect these properties of the obtained materials.
publishDate 2013
dc.date.available.fl_str_mv 2013-09-12
2016-06-02T20:34:46Z
dc.date.issued.fl_str_mv 2013-08-30
dc.date.accessioned.fl_str_mv 2016-06-02T20:34:46Z
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dc.publisher.none.fl_str_mv Universidade Federal de São Carlos
dc.publisher.program.fl_str_mv Programa de Pós-Graduação em Química - PPGQ
dc.publisher.initials.fl_str_mv UFSCar
dc.publisher.country.fl_str_mv BR
publisher.none.fl_str_mv Universidade Federal de São Carlos
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFSCAR
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