Structural evolution, growth mechanism and photoluminescence properties of CuWO4 nanocrystals

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dc.contributor.authorSouza, E. L. S.
dc.contributor.authorSczancoski, J. C.
dc.contributor.authorNogueira, I. C.
dc.contributor.authorAlmeida, M. A. P.
dc.contributor.authorOrlandi, M. O. [UNESP]
dc.contributor.authorLi, M. S.
dc.contributor.authorLuz, R. A. S.
dc.contributor.authorFilho, M. G. R.
dc.contributor.authorLongo, E. [UNESP]
dc.contributor.authorCavalcante, L. S.
dc.contributor.institutionUniv Estadual Piaui
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionICE Univ Fed Amazonas
dc.contributor.institutionCCT Univ Fed Maranhao
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2018-11-26T17:35:05Z
dc.date.available2018-11-26T17:35:05Z
dc.date.issued2017-09-01
dc.description.abstractCopper tungstate (CuWO4) crystals were synthesized by the sonochemistry (SC) method, and then, heat treated in a conventional furnace at different temperatures for 1 h. The structural evolution, growth mechanism and photoluminescence (PL) properties of these crystals were thoroughly investigated. Xray diffraction patterns, micro-Raman spectra and Fourier transformed infrared spectra indicated that crystals heat treated and 100 C and 200 C have water molecules in their lattice (copper tungstate dihydrate (CuWO4.2H(2)O) with monoclinic structure), when the crystals are calcinated at 300 C have the presence of two phase (CuWO4.2H(2)O and CuWO4), while the others heat treated at 400 C and 500 C have a single CuWO4 triclinic structure. Field emission scanning electron microscopy revealed a change in the morphological features of these crystals with the increase of the heat treatment temperature. Transmission electron microscopy (TEM), high resolution-TEM images and selected area electron diffraction were employed to examine the shape, size and structure of these crystals. Ultraviolet-Visible spectra evidenced a decrease of band gap values with the increase of the temperature, which were correlated with the reduction of intermediary energy levels within the band gap. The intense photoluminescence (PL) emission was detected for the sample heat treat at 300 C for 1 h, which have a mixture of CuWO4.2H(2)O and CuWO4 phases. Therefore, there is a synergic effect between the intermediary energy levels arising from these two phases during the electronic transitions responsible for PL emissions. (C) 2017 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Estadual Piaui, PPGQ CCN GERATEC, Rua Joao Cabral,N 2231,POB 381, BR-64002150 Teresina, PI, Brazil
dc.description.affiliationUniv Fed Sao Carlos, DQ UFSCar, POB 676, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationICE Univ Fed Amazonas, Av Rodrigo Otavio Japiim,POB 670, BR-69077000 Manaus, Amazonas, Brazil
dc.description.affiliationCCT Univ Fed Maranhao, POB 322, BR-65080805 Sao Luis, MA, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Fis Quim, BR-14800060 Araraquara, SP, Brazil
dc.description.affiliationIFSC Univ Sao Paulo, POB 369, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Fis Quim, BR-14800060 Araraquara, SP, 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.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdCNPq: 479644/2012-8
dc.description.sponsorshipIdCNPq: 304531/2013-8
dc.description.sponsorshipIdFAPESP: 2012/14004-5
dc.description.sponsorshipIdFAPESP: 2013/07296-2
dc.description.sponsorshipIdCAPES: 1268069
dc.format.extent256-270
dc.identifierhttp://dx.doi.org/10.1016/j.ultsonch.2017.03.007
dc.identifier.citationUltrasonics Sonochemistry. Amsterdam: Elsevier Science Bv, v. 38, p. 256-270, 2017.
dc.identifier.doi10.1016/j.ultsonch.2017.03.007
dc.identifier.fileWOS000404814700026.pdf
dc.identifier.issn1350-4177
dc.identifier.urihttp://hdl.handle.net/11449/162958
dc.identifier.wosWOS:000404814700026
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofUltrasonics Sonochemistry
dc.relation.ispartofsjr1,412
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectCuWO4 crystals
dc.subjectSonochemistry
dc.subjectClusters
dc.subjectRaman spectroscopy
dc.subjectTEM images
dc.subjectPhotoluminescence properties
dc.titleStructural evolution, growth mechanism and photoluminescence properties of CuWO4 nanocrystalsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.

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