Cluster Coordination and Photoluminescence Properties of alpha-Ag2WO4 Microcrystals

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dc.contributor.authorCavalcante, L. S. [UNESP]
dc.contributor.authorAlmeida, M. A. P.
dc.contributor.authorAvansi, W. [UNESP]
dc.contributor.authorTranquilin, R. L.
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.authorBatista, N. C.
dc.contributor.authorMastelaro, V. R.
dc.contributor.authorSiu Li, M.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual do Piauí (UESPI)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T15:31:38Z
dc.date.available2014-05-20T15:31:38Z
dc.date.issued2012-10-15
dc.description.abstractIn this paper, we report our initial research to obtain hexagonal rod-like elongated silver tungstate (alpha-Ag2WO4) microcrystals by different methods [sonochemistry (SC), coprecipitation (CP), and conventional hydrothermal (CH)] and to study their cluster coordination and optical properties. These microcrystals were structurally characterized by X-ray diffraction (XRD), Rietveld refinements, Fourier transform infrared (FT-IR), X-ray absorption near-edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) spectroscopies. The shape and average size of these alpha-Ag2WO4 microcrystals were observed by field-emission scanning electron microscopy (FE-SEM). The optical properties of these microcrystals were investigated by ultraviolet-visible (UV-vis) spectroscopy and photoluminescence (PL) measurements. XRD patterns and Rietveld refinement data confirmed that alpha-Ag2WO4 microcrystals have an orthorhombic structure. FT-IR spectra exhibited four IR-active modes in a range from 250 to 1000 cm(-1). XANES spectra at the W L-3-edge showed distorted octahedral [WO6] clusters in the lattice, while EXAFS analyses confirmed that W atoms are coordinated by six O atoms. FE-SEM images suggest that the alpha-Ag2WO4 microcrystals grow by aggregation and the Ostwald ripening process. PL properties of alpha-Ag2WO4 microcrystals decrease with an increase in the optical band-gap values (3.19-3.23 eV). Finally, we observed that large hexagonal rod-like alpha-Ag2WO4 microcrystals prepared by the SC method exhibited a major PL emission intensity relative to alpha-Ag2WO4 microcrystals prepared by the CP and CH methods.en
dc.description.affiliationUniv Estadual Paulista, BR-14801907 São Paulo, Brazil
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), BR-13565905 São Paulo, Brazil
dc.description.affiliationUESPI CCN, Dept Quim, BR-64002150 Teresina, PI, Brazil
dc.description.affiliationUniv São Paulo, IFSC, BR-13560970 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, BR-14801907 São Paulo, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Piauí (FAPEPI)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdCNPq: 159710/2011-1
dc.description.sponsorshipIdFAPESP: 09/53189-8
dc.description.sponsorshipIdFAPEPI-GERATEC: 01.08.0506.00
dc.format.extent10675-10687
dc.identifierhttp://dx.doi.org/10.1021/ic300948n
dc.identifier.citationInorganic Chemistry. Washington: Amer Chemical Soc, v. 51, n. 20, p. 10675-10687, 2012.
dc.identifier.doi10.1021/ic300948n
dc.identifier.issn0020-1669
dc.identifier.urihttp://hdl.handle.net/11449/40710
dc.identifier.wosWOS:000309739100024
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofInorganic Chemistry
dc.relation.ispartofjcr4.700
dc.relation.ispartofsjr1,892
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleCluster Coordination and Photoluminescence Properties of alpha-Ag2WO4 Microcrystalsen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/page/copyright/index.html
dcterms.rightsHolderAmer Chemical Soc
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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