A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation

Detalhes bibliográficos
Autor(a) principal: Boita, Jocenir
Data de Publicação: 2015
Outros Autores: Castegnaro, Marcus Vinicíus, Alves, Maria do Carmo Martins, Morais, Jonder
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/117076
Resumo: In situ time-resolved X-ray absorption spectroscopy (XAS) measurements collected at the Pt L3-edge during the synthesis of Pt nanoparticles (NPs) in aqueous solution are reported. A specially designed dispenser–reactor apparatus allowed for monitoring changes in the XAS spectra from the earliest moments of Pt ions in solution until the formation of metallic nanoparticles with a mean diameter of 4.9 1.1 nm. By monitoring the changes in the local chemical environment of the Pt atoms in real time, it was possible to observe that the NPs formation kinetics involved two stages: a reduction-nucleation burst followed by a slow growth and stabilization of NPs. Subsequently, the synthesized Pt NPs were supported on activated carbon and characterized by synchrotron-radiation-excited X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS). The supported Pt NPs remained in the metallic chemical state and with a reduced size, presenting slight lattice parameter contraction in comparison with the bulk Pt values.
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spelling Boita, JocenirCastegnaro, Marcus VinicíusAlves, Maria do Carmo MartinsMorais, Jonder2015-05-23T02:01:40Z20151600-5775http://hdl.handle.net/10183/117076000967111In situ time-resolved X-ray absorption spectroscopy (XAS) measurements collected at the Pt L3-edge during the synthesis of Pt nanoparticles (NPs) in aqueous solution are reported. A specially designed dispenser–reactor apparatus allowed for monitoring changes in the XAS spectra from the earliest moments of Pt ions in solution until the formation of metallic nanoparticles with a mean diameter of 4.9 1.1 nm. By monitoring the changes in the local chemical environment of the Pt atoms in real time, it was possible to observe that the NPs formation kinetics involved two stages: a reduction-nucleation burst followed by a slow growth and stabilization of NPs. Subsequently, the synthesized Pt NPs were supported on activated carbon and characterized by synchrotron-radiation-excited X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS). The supported Pt NPs remained in the metallic chemical state and with a reduced size, presenting slight lattice parameter contraction in comparison with the bulk Pt values.application/pdfengJournal of synchrotron radiation. Copenhagen. Vol. 22, no. 3 (May 2015), p. 736-744NanopartículasEspectroscopia de absorção de raios-xDifração de raios XPlatinaA dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formationEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000967111.pdf000967111.pdfTexto completo (inglês)application/pdf1244969http://www.lume.ufrgs.br/bitstream/10183/117076/1/000967111.pdf78c1fee1899aa9f48620c350af3fcab5MD51TEXT000967111.pdf.txt000967111.pdf.txtExtracted Texttext/plain40889http://www.lume.ufrgs.br/bitstream/10183/117076/2/000967111.pdf.txt3263c37bffbab73141bf5674ff2bd1e4MD52THUMBNAIL000967111.pdf.jpg000967111.pdf.jpgGenerated Thumbnailimage/jpeg1443http://www.lume.ufrgs.br/bitstream/10183/117076/3/000967111.pdf.jpgba0a7f062200fc4c8514a5c2da9cfaacMD5310183/1170762024-07-20 06:22:03.677094oai:www.lume.ufrgs.br:10183/117076Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2024-07-20T09:22:03Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation
title A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation
spellingShingle A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation
Boita, Jocenir
Nanopartículas
Espectroscopia de absorção de raios-x
Difração de raios X
Platina
title_short A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation
title_full A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation
title_fullStr A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation
title_full_unstemmed A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation
title_sort A dispenser–reactor apparatus applied for in situ XAS monitoring of Pt nanoparticle formation
author Boita, Jocenir
author_facet Boita, Jocenir
Castegnaro, Marcus Vinicíus
Alves, Maria do Carmo Martins
Morais, Jonder
author_role author
author2 Castegnaro, Marcus Vinicíus
Alves, Maria do Carmo Martins
Morais, Jonder
author2_role author
author
author
dc.contributor.author.fl_str_mv Boita, Jocenir
Castegnaro, Marcus Vinicíus
Alves, Maria do Carmo Martins
Morais, Jonder
dc.subject.por.fl_str_mv Nanopartículas
Espectroscopia de absorção de raios-x
Difração de raios X
Platina
topic Nanopartículas
Espectroscopia de absorção de raios-x
Difração de raios X
Platina
description In situ time-resolved X-ray absorption spectroscopy (XAS) measurements collected at the Pt L3-edge during the synthesis of Pt nanoparticles (NPs) in aqueous solution are reported. A specially designed dispenser–reactor apparatus allowed for monitoring changes in the XAS spectra from the earliest moments of Pt ions in solution until the formation of metallic nanoparticles with a mean diameter of 4.9 1.1 nm. By monitoring the changes in the local chemical environment of the Pt atoms in real time, it was possible to observe that the NPs formation kinetics involved two stages: a reduction-nucleation burst followed by a slow growth and stabilization of NPs. Subsequently, the synthesized Pt NPs were supported on activated carbon and characterized by synchrotron-radiation-excited X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS). The supported Pt NPs remained in the metallic chemical state and with a reduced size, presenting slight lattice parameter contraction in comparison with the bulk Pt values.
publishDate 2015
dc.date.accessioned.fl_str_mv 2015-05-23T02:01:40Z
dc.date.issued.fl_str_mv 2015
dc.type.driver.fl_str_mv Estrangeiro
info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/117076
dc.identifier.issn.pt_BR.fl_str_mv 1600-5775
dc.identifier.nrb.pt_BR.fl_str_mv 000967111
identifier_str_mv 1600-5775
000967111
url http://hdl.handle.net/10183/117076
dc.language.iso.fl_str_mv eng
language eng
dc.relation.ispartof.pt_BR.fl_str_mv Journal of synchrotron radiation. Copenhagen. Vol. 22, no. 3 (May 2015), p. 736-744
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eu_rights_str_mv openAccess
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