Nanoparticle characterization of Er-doped SnO2 pellets obtained with different pH of colloidal suspension

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorRavaro, Leandro P.
dc.creatorScalvi, Luis Vicente de Andrade
dc.creatorTabata, Américo Sheitiro
dc.creatorPontes, Fenelon Martinho Lima
dc.creatorOliveira, José Brás Barreto de
dc.date2014-05-27T11:30:16Z
dc.date2016-10-25T18:53:00Z
dc.date2014-05-27T11:30:16Z
dc.date2016-10-25T18:53:00Z
dc.date2013-08-28
dc.date.accessioned2017-04-06T02:36:17Z
dc.date.available2017-04-06T02:36:17Z
dc.identifierJournal of Applied Physics, v. 114, n. 8, 2013.
dc.identifier0021-8979
dc.identifierhttp://hdl.handle.net/11449/76345
dc.identifierhttp://acervodigital.unesp.br/handle/11449/76345
dc.identifier10.1063/1.4819089
dc.identifierWOS:000323911100083
dc.identifier2-s2.0-84883865470.pdf
dc.identifier2-s2.0-84883865470
dc.identifierhttp://dx.doi.org/10.1063/1.4819089
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/897045
dc.descriptionSnO2:2 at. %Er xerogel samples were obtained by sol-gel technique from colloidal suspensions with distinct pHs. The evaluation of critical regions inside the nanocrystallite is fundamental for the interpretation of the influence of pH on the emission data. In this way, the nanocrystal depletion layer thickness was obtained with the help of photoluminescence, Raman, X-ray diffraction, and field-emission gun scanning electron microscopy measurements. It was observed that acid suspensions (pH < 7) lead to high surface disorder in which a larger number of cross-linked bonds Sn-O-Sn among nanoparticles are present. For these samples, the nanoparticle depletion layer is larger as compared to samples obtained from other pH. Photoluminescence measurement in the near infrared region indicates that the emission intensity of the transition 4I13/2 → 4I15/2 is also influenced by the pH of the starting colloidal suspension, generating peaks more or less broadened, depending on location of Er3+ ions in the SnO2 lattice (high or low symmetry sites). © 2013 AIP Publishing LLC.
dc.languageeng
dc.relationJournal of Applied Physics
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectColloidal suspensions
dc.subjectDepletion-layer thickness
dc.subjectEmission intensity
dc.subjectField emission guns
dc.subjectNear infrared region
dc.subjectPhotoluminescence measurements
dc.subjectSol-gel technique
dc.subjectSurface disorder
dc.subjectErbium
dc.subjectNanoparticles
dc.subjectPhotoluminescence
dc.subjectScanning electron microscopy
dc.subjectSol-gels
dc.subjectTin
dc.subjectX ray diffraction
dc.subjectSuspensions (fluids)
dc.titleNanoparticle characterization of Er-doped SnO2 pellets obtained with different pH of colloidal suspension
dc.typeOtro


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