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Structural Refinement and Photoluminescence Properties of MnWO4 Nanorods Obtained by Microwave-Hydrothermal Synthesis

dc.contributor.authorAlmeida, M. A. P.
dc.contributor.authorCavalcante, L. S. [UNESP]
dc.contributor.authorSiu Li, M.
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T15:29:59Z
dc.date.available2014-05-20T15:29:59Z
dc.date.issued2012-01-01
dc.description.abstractManganese tungstate (MnWO4) nanorods were prepared at room temperature by the co-precipitation method and synthesized after processing in a microwave-hydrothermal (MH) system at 140 degrees C for 6-96 min. These nanorods were structurally characterized by X-ray diffraction (XRD), Rietveld refinements and Fourier transform (FT)-Raman spectroscopy. The growth direction, shape and average size distribution of nanorods were observed by means of transmission electron microscopy (TEM) and high resolution TEM (HR-TEM). The optical properties of the nanorods were investigated by ultraviolet visible (UV-vis) absorption and photoluminescence (PL) measurements. XRD patterns, Rietveld refinement data and FT-Raman spectroscopy indicate that the MnWO4 precipitate is not a single phase structure while the nanorods synthesized by MH processing have a wolframite-type monoclinic structure without deleterious phases. FT-Raman spectra exhibited the presence of 17 Raman-active modes from 50 to 1,000 cm(-1). TEM and HR-TEM micrographs indicated that the nanorods are aggregated due to surface energy by Van der Waals forces and grow along the [100] direction. UV-vis absorption measurements confirmed non-linear values for the optical band gap (from 3.2 to 2.72 eV), which increased as the MH processing time increased. The structural characterizations indicated that the presence of defects in the MnWO4 precipitate promotes a significant contribution to maximum PL emission, while MnWO4 nanorods obtained by MH processing decrease the PL emission due to the reduction of defects in the lattice.en
dc.description.affiliationLIEC IQ Univ Estadual Paulista, BR-14801907 Araraquara, SP, Brazil
dc.description.affiliationLIEC DQ Universidade Federal de São Carlos (UFSCar), BR-13565905 São Carlos, SP, Brazil
dc.description.affiliationUniv São Paulo, IFSC, BR-13560970 São Carlos, SP, Brazil
dc.description.affiliationUnespLIEC IQ Univ Estadual Paulista, BR-14801907 Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 09/53189-8/50303-4
dc.format.extent264-271
dc.identifierhttp://dx.doi.org/10.1007/s10904-011-9548-9
dc.identifier.citationJournal of Inorganic and Organometallic Polymers and Materials. Dordrecht: Springer, v. 22, n. 1, p. 264-271, 2012.
dc.identifier.doi10.1007/s10904-011-9548-9
dc.identifier.issn1574-1443
dc.identifier.urihttp://hdl.handle.net/11449/39450
dc.identifier.wosWOS:000301518100039
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofJournal of Inorganic and Organometallic Polymers and Materials
dc.relation.ispartofjcr1.754
dc.relation.ispartofsjr0,402
dc.rights.accessRightsAcesso restritopt
dc.sourceWeb of Science
dc.subjectMnWO4en
dc.subjectMicrowave-hydrothermalen
dc.subjectRietveld refinementen
dc.subjectPhotoluminescenceen
dc.titleStructural Refinement and Photoluminescence Properties of MnWO4 Nanorods Obtained by Microwave-Hydrothermal Synthesisen
dc.typeArtigopt
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
dspace.entity.typePublication
relation.isOrgUnitOfPublicationbc74a1ce-4c4c-4dad-8378-83962d76c4fd
relation.isOrgUnitOfPublication.latestForDiscoverybc74a1ce-4c4c-4dad-8378-83962d76c4fd
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentBioquímica e Tecnologia - IQARpt
unesp.departmentFísico-Química - IQARpt

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