Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
DOI: | 10.5772/58923 |
Texto Completo: | http://dx.doi.org/10.5772/58923 http://hdl.handle.net/11449/117629 |
Resumo: | Silver molybdate (Ag2MoO4) and silver tungstate (Ag2WO4) nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 degrees C) and co-precipitation (pH 4, 70 degrees C), and were then used to prepare two core/shell composites, namely alpha-Ag2WO4/beta-Ag2MoO4 (MAH, pH 4, 140 degrees C) and beta-Ag2MoO4/beta-Ag2WO4 (co-precipitation, pH 4, 70 degrees C). The shape and size of the microcrystals were observed by field emission scanning electron microscopy (FE-SEM), different morphologies such as balls and nanorods. These powders were characterized by X-ray powder diffraction and UV-vis (diffuse reflectance and photoluminescence). X-ray diffraction patterns showed that the Ag2MoO4 samples obtained by the two methods were single-phased and belonged to the beta-Ag2MoO4 structure (spinel type). In contrast, the Ag2WO4 obtained in the two syntheses were structurally different: MAH exhibited the well-known tetrameric stable structure alpha-Ag2WO4, while co-precipitation afforded the metastable beta-Ag2WO4 allotrope, coexisting with a weak amount of the alpha-phase. The optical gap of beta-Ag2WO4 (3.3 eV) was evaluated for the first time. In contrast to beta-Ag2MoO4/beta-Ag2WO4, the alpha-Ag2WO4/beta-Ag2MoO4 exhibited strongly-enhanced photoluminescence in the low-energy band (650 nm), tentatively explained by the creation of a large density of local defects (distortions) at the core-shell interface, due to the presence of two different types of MOx polyhedra in the two structures. |
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Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced PhotoluminescenceSilver MolybdateSilver TungstatePhotoluminescenceDecorated SystemSilver molybdate (Ag2MoO4) and silver tungstate (Ag2WO4) nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 degrees C) and co-precipitation (pH 4, 70 degrees C), and were then used to prepare two core/shell composites, namely alpha-Ag2WO4/beta-Ag2MoO4 (MAH, pH 4, 140 degrees C) and beta-Ag2MoO4/beta-Ag2WO4 (co-precipitation, pH 4, 70 degrees C). The shape and size of the microcrystals were observed by field emission scanning electron microscopy (FE-SEM), different morphologies such as balls and nanorods. These powders were characterized by X-ray powder diffraction and UV-vis (diffuse reflectance and photoluminescence). X-ray diffraction patterns showed that the Ag2MoO4 samples obtained by the two methods were single-phased and belonged to the beta-Ag2MoO4 structure (spinel type). In contrast, the Ag2WO4 obtained in the two syntheses were structurally different: MAH exhibited the well-known tetrameric stable structure alpha-Ag2WO4, while co-precipitation afforded the metastable beta-Ag2WO4 allotrope, coexisting with a weak amount of the alpha-phase. The optical gap of beta-Ag2WO4 (3.3 eV) was evaluated for the first time. In contrast to beta-Ag2MoO4/beta-Ag2WO4, the alpha-Ag2WO4/beta-Ag2MoO4 exhibited strongly-enhanced photoluminescence in the low-energy band (650 nm), tentatively explained by the creation of a large density of local defects (distortions) at the core-shell interface, due to the presence of two different types of MOx polyhedra in the two structures.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)state of Sao PauloUniv Estadual Paulista, UNESP, CDMF INCTMN, Araraquara, SP, BrazilUniv Fed Sao Carlos, UFSCar, CDMF INCTMN, BR-13560 Sao Carlos, SP, BrazilUniv Rennes 1, Rennes, FranceUniv Jaume 1, Dept Expt Sci, Castellon de La Plana, SpainUniv Estadual Paulista, UNESP, CDMF INCTMN, Araraquara, SP, BrazilCNPq: 573636/2008-7FAPESP: 13/07296-2FAPESP: 08/57872-1state of Sao Paulo2012/22823-6Intech EuropeUniversidade Estadual Paulista (Unesp)Universidade Federal de São Carlos (UFSCar)Univ Rennes 1Univ Jaume 1De Santana, Yuri V. B. [UNESP]Cardoso Gomes, Jose ErnaneMatos, LeandroCruvinel, Guilherme HenriquePerrin, AndrePerrin, ChristianeAndres, JuanVarela, José Arana [UNESP]Longo, Elson [UNESP]2015-03-18T15:56:35Z2015-03-18T15:56:35Z2014-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10application/pdfhttp://dx.doi.org/10.5772/58923Nanomaterials And Nanotechnology. Rijeka: Intech Europe, v. 4, 10 p., 2014.1847-9804http://hdl.handle.net/11449/11762910.5772/58923WOS:000341353100001WOS000341353100001.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengNanomaterials And Nanotechnology1.7300,366info:eu-repo/semantics/openAccess2023-10-31T06:07:08Zoai:repositorio.unesp.br:11449/117629Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:30:19.580203Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence |
title |
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence |
spellingShingle |
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence De Santana, Yuri V. B. [UNESP] Silver Molybdate Silver Tungstate Photoluminescence Decorated System De Santana, Yuri V. B. [UNESP] Silver Molybdate Silver Tungstate Photoluminescence Decorated System |
title_short |
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence |
title_full |
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence |
title_fullStr |
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence |
title_full_unstemmed |
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence |
title_sort |
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence |
author |
De Santana, Yuri V. B. [UNESP] |
author_facet |
De Santana, Yuri V. B. [UNESP] De Santana, Yuri V. B. [UNESP] Cardoso Gomes, Jose Ernane Matos, Leandro Cruvinel, Guilherme Henrique Perrin, Andre Perrin, Christiane Andres, Juan Varela, José Arana [UNESP] Longo, Elson [UNESP] Cardoso Gomes, Jose Ernane Matos, Leandro Cruvinel, Guilherme Henrique Perrin, Andre Perrin, Christiane Andres, Juan Varela, José Arana [UNESP] Longo, Elson [UNESP] |
author_role |
author |
author2 |
Cardoso Gomes, Jose Ernane Matos, Leandro Cruvinel, Guilherme Henrique Perrin, Andre Perrin, Christiane Andres, Juan Varela, José Arana [UNESP] Longo, Elson [UNESP] |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Federal de São Carlos (UFSCar) Univ Rennes 1 Univ Jaume 1 |
dc.contributor.author.fl_str_mv |
De Santana, Yuri V. B. [UNESP] Cardoso Gomes, Jose Ernane Matos, Leandro Cruvinel, Guilherme Henrique Perrin, Andre Perrin, Christiane Andres, Juan Varela, José Arana [UNESP] Longo, Elson [UNESP] |
dc.subject.por.fl_str_mv |
Silver Molybdate Silver Tungstate Photoluminescence Decorated System |
topic |
Silver Molybdate Silver Tungstate Photoluminescence Decorated System |
description |
Silver molybdate (Ag2MoO4) and silver tungstate (Ag2WO4) nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 degrees C) and co-precipitation (pH 4, 70 degrees C), and were then used to prepare two core/shell composites, namely alpha-Ag2WO4/beta-Ag2MoO4 (MAH, pH 4, 140 degrees C) and beta-Ag2MoO4/beta-Ag2WO4 (co-precipitation, pH 4, 70 degrees C). The shape and size of the microcrystals were observed by field emission scanning electron microscopy (FE-SEM), different morphologies such as balls and nanorods. These powders were characterized by X-ray powder diffraction and UV-vis (diffuse reflectance and photoluminescence). X-ray diffraction patterns showed that the Ag2MoO4 samples obtained by the two methods were single-phased and belonged to the beta-Ag2MoO4 structure (spinel type). In contrast, the Ag2WO4 obtained in the two syntheses were structurally different: MAH exhibited the well-known tetrameric stable structure alpha-Ag2WO4, while co-precipitation afforded the metastable beta-Ag2WO4 allotrope, coexisting with a weak amount of the alpha-phase. The optical gap of beta-Ag2WO4 (3.3 eV) was evaluated for the first time. In contrast to beta-Ag2MoO4/beta-Ag2WO4, the alpha-Ag2WO4/beta-Ag2MoO4 exhibited strongly-enhanced photoluminescence in the low-energy band (650 nm), tentatively explained by the creation of a large density of local defects (distortions) at the core-shell interface, due to the presence of two different types of MOx polyhedra in the two structures. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-08-01 2015-03-18T15:56:35Z 2015-03-18T15:56:35Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.5772/58923 Nanomaterials And Nanotechnology. Rijeka: Intech Europe, v. 4, 10 p., 2014. 1847-9804 http://hdl.handle.net/11449/117629 10.5772/58923 WOS:000341353100001 WOS000341353100001.pdf |
url |
http://dx.doi.org/10.5772/58923 http://hdl.handle.net/11449/117629 |
identifier_str_mv |
Nanomaterials And Nanotechnology. Rijeka: Intech Europe, v. 4, 10 p., 2014. 1847-9804 10.5772/58923 WOS:000341353100001 WOS000341353100001.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Nanomaterials And Nanotechnology 1.730 0,366 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
10 application/pdf |
dc.publisher.none.fl_str_mv |
Intech Europe |
publisher.none.fl_str_mv |
Intech Europe |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1822182482666061824 |
dc.identifier.doi.none.fl_str_mv |
10.5772/58923 |