Hydrothermal Microwave: A New Route to Obtain Photoluminescent Crystalline BaTiO3 Nanoparticles

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dc.contributor.authorMoreira, M. L.
dc.contributor.authorMambrini, G. P.
dc.contributor.authorVolanti, D. P. [UNESP]
dc.contributor.authorLeite, E. R.
dc.contributor.authorOrlandi, M. O. [UNESP]
dc.contributor.authorPizani, P. S.
dc.contributor.authorMastelaro, V. R.
dc.contributor.authorPaiva-Santos, C. O. [UNESP]
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2014-05-20T13:29:47Z
dc.date.available2014-05-20T13:29:47Z
dc.date.issued2008-08-26
dc.description.abstractHydrothermal microwave method was used as a new route to synthesize pure BaTiO3 (BT) nanoparticles at 140 degrees C for 10 min under rapid reacting with stoichiometric Ba/Ti ratio. The crystalline products were characterized by X-ray powder diffraction (XRD) and the structure was refined by the Rietveld method from the tetragonal structure, which was supported by the Ti K-edge X-ray absorption near-edge structure (XANES). The pre-edge of Ti in the XANES spectra indicated that titanium ions are localized in a nonregular octahedron. Typical FT-Raman spectra for tetragonal BaTiO3 nanoparticles presented well-defined peaks, indicating a substantial short-range order in the system. However, a scattering peak at 810 cm was attributed to the presence of lattice OH groups, commonly found in materials obtained by hydrothermal process. Besides, the peak at 716 cm(-1) can be related to eventual Ba2+ defects in the BaTiO3 lattice. BaTiO3 (BT) nanoparticles presented spherical morphology with a non-uniform distribution of particle sizes. An intense and broad photoluminescence band was observed around the green color emission at room temperature. By means of an excitation energy of 2.54 eV (488 nm), it was noted that the maximum profile emission (2.2 eV) is smaller than the forbidden band gap energy of BaTiO3, indicating that certain localized levels within the band gap must exist.en
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), Dept Quim, LIEC, BR-13565905 São Carlos, SP, Brazil
dc.description.affiliationUNESP, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.affiliationUniversidade Federal de São Carlos (UFSCar), Dept Fis, BR-13565905 São Carlos, SP, Brazil
dc.description.affiliationUSP, Inst Fis, BR-13560970 São Carlos, SP, Brazil
dc.description.affiliationUNESP, Inst Quim, LIEC, BR-14801907 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Quim, LIEC, BR-14801907 Araraquara, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent5381-5387
dc.identifierhttp://dx.doi.org/10.1021/cm801638d
dc.identifier.citationChemistry of Materials. Washington: Amer Chemical Soc, v. 20, n. 16, p. 5381-5387, 2008.
dc.identifier.doi10.1021/cm801638d
dc.identifier.issn0897-4756
dc.identifier.lattes2354739980406725
dc.identifier.orcid0000-0001-9315-9392
dc.identifier.urihttp://hdl.handle.net/11449/10084
dc.identifier.wosWOS:000258580500042
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofChemistry of Materials
dc.relation.ispartofjcr9.890
dc.relation.ispartofsjr4,675
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleHydrothermal Microwave: A New Route to Obtain Photoluminescent Crystalline BaTiO3 Nanoparticlesen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/page/copyright/index.html
dcterms.rightsHolderAmer Chemical Soc
unesp.author.lattes2354739980406725[3]
unesp.author.orcid0000-0001-9315-9392[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

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Artigos - Física e Química - FEIS