Effect of reaction time on the particle size of ZnO and ZnO : Ce obtained by a sol-gel method

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dc.contributor.authorFlor, J.
dc.contributor.authorde Lima, SAM
dc.contributor.authorDavolos, Marian Rosaly [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:30:09Z
dc.date.available2014-05-20T15:30:09Z
dc.date.issued2004-01-01
dc.description.abstractIn this work particles of ZnO of size range 33-56 Angstrom were prepared by a sol-gel method. The effect of reaction time on the particle size of ZnO or ZnO:Ce was investigated by transmission electron microscopy measurements, UV-vis absorption and luminescence spectroscopy. A linear increase of the mean particle size is observed as a function of reaction time. The cerium-doped particles are bigger than the pure ZnO ones obtained at the same reaction time. A shift to lower energy at the maximum of the bands is observed in all absorption, emission and excitation spectra as a function of particle growth. From the absorption spectra the optical energy gap values (Eg) for these particles were determined. In the quantum size regime, Eg was found to decrease with particle growth.en
dc.description.affiliationUniv Estadual Paulista, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.format.extent239-243
dc.identifierhttp://dx.doi.org/10.1007/b97093
dc.identifier.citationSurface and Colloid Science. Berlin: Springer-verlag Berlin, v. 128, p. 239-243, 2004.
dc.identifier.doi10.1007/b97093
dc.identifier.issn0340-255X
dc.identifier.lattes4284809342546287
dc.identifier.urihttp://hdl.handle.net/11449/39599
dc.identifier.wosWOS:000227020900046
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofSurface and Colloid Science
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectceriumpt
dc.subjectzinc oxidept
dc.subjectnanoparticlept
dc.subjectluminescencept
dc.titleEffect of reaction time on the particle size of ZnO and ZnO : Ce obtained by a sol-gel methoden
dc.typeTrabalho apresentado em evento
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
unesp.author.lattes4284809342546287
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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