dc.contributorRosa, Ieda Lucia Viana
dc.contributorhttp://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4728685Z6
dc.contributorhttp://lattes.cnpq.br/1461337173265474
dc.creatorOliveira, Larissa Helena de
dc.date.accessioned2009-06-30
dc.date.accessioned2016-06-02T20:36:16Z
dc.date.available2009-06-30
dc.date.available2016-06-02T20:36:16Z
dc.date.created2009-06-30
dc.date.created2016-06-02T20:36:16Z
dc.date.issued2008-08-22
dc.identifierOLIVEIRA, Larissa Helena de. SiO2-GeO2 Soot Perform as a core for Eu2O3 nanocoating: Synthesis and Photophysical study. 2008. 71 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2008.
dc.identifierhttps://repositorio.ufscar.br/handle/ufscar/6420
dc.description.abstractSome materials can be encapsulated with metals, inorganic solids and biomolecules, in a nanometric scale, to form a nanocomposite which has specific properties that can be open to research and technology works. In the literature, they are represented as core@shell. When silica particles are coated with a luminescent material, as the Eu2O3, the final material will have different properties from the core and the shell material. The silica used as a core in this work is the silica-germania VAD, synthesized by the Vapor-phase Axial Deposition (VAD) technique, which has been given by the PhD. Carlos K. Suzuki from FEM-UNICAMP. The luminescent properties of the Eu3+ ion in the SiO2-GeO2@Eu2O3 material, has been studied to get some information about the environment around this ion during the heat treatment process. The emission spectra of the samples presented the main Eu3+ characteristics 5D0→7FJ ( J= 0,1,2,3, 4) bands. The degradation of the polymeric shell which involves the Eu3+ ions degradation occurs as the temperature increases, causing structural changes around this ion. With its degradation, the Eu3+ ion is incorporated to the silica-germania matrix. The interaction between this ion and the matrix is through Ge-O-Eu linkages, which suppress the Eu3+ luminescence. The same luminescence behavior is observed for the SiO2@Eu2O3 and SiO2@Eu2O3 spherical samples heat treat in the same temperatures. The lifetime curves for these materials when they are excited in its respective maximum of emission and excitation, present a mono-exponential feature and the values are higher than Eu2O3 pure. This material presented some novel optical properties, which makes it in a potential candidate to be used in a photonic area.
dc.publisherUniversidade Federal de São Carlos
dc.publisherBR
dc.publisherUFSCar
dc.publisherPrograma de Pós-Graduação em Química - PPGQ
dc.rightsAcesso Aberto
dc.subjectLuminescência
dc.subjectEurópio
dc.subjectEncapsulamento
dc.subjectPartículas core-shell
dc.subjectSiO2-GeO2
dc.titleSíntese, caracterização e estudo das propriedades fotofísicas de SiO2-GeO2 VAD encapsulada com Eu2O3
dc.typeTesis


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