Quantification of MgO surface excess on the SnO 2 nanoparticles and relationship with nanostability and growth

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dc.contributor.authorGOUVEA, D.
dc.contributor.authorPEREIRA, G. J.
dc.contributor.authorGENGEMBRE, L.
dc.contributor.authorSTEIL, M. C.
dc.contributor.authorROUSSEL, P.
dc.contributor.authorRUBBENS, A.
dc.contributor.authorHIDALGO, P.
dc.contributor.authorCASTRO, R. H. R.
dc.date.accessioned2022-01-12T22:03:33Z
dc.date.available2022-01-12T22:03:33Z
dc.date.issued2011-02-15
dc.description.abstractIn this work, we experimentally showed that the spontaneous segregation of MgO as surface excess in MgO doped SnO 2 nanoparticles plays an important role in the system's energetics and stability. Using X-ray fluorescence in specially treated samples, we quantitatively determined the fraction of MgO forming surface excess when doping SnO 2 with several different concentrations and established a relationship between this amount and the surface energy of the nanoparticles using the Gibbs approach. We concluded that the amount of Mg ions on the surface was directly related to the nanoparticles total free energy, in a sense that the dopant will always spontaneously distribute itself to minimize it if enough diffusion is provided. Because we were dealing with nanosized particles, the effect of MgO on the surface was particularly important and has a direct effect on the equilibrium particle size (nanoparticle stability), such that the lower the surface energy is, the smaller the particle sizes are, evidencing and quantifying the thermodynamic basis of using additives to control SnO 2 nanoparticles stability. © 2010 Elsevier B.V.
dc.description.firstpage4219
dc.description.issuenumber9
dc.description.lastpage4226
dc.description.volume257
dc.identifier.citationGOUVEA, D.; PEREIRA, G. J.; GENGEMBRE, L.; STEIL, M. C.; ROUSSEL, P.; RUBBENS, A.; HIDALGO, P.; CASTRO, R. H. R. Quantification of MgO surface excess on the SnO 2 nanoparticles and relationship with nanostability and growth. Applied Surface Science, v. 257, n. 9, p. 4219-4226, Feb. 2011.
dc.identifier.doi10.1016/j.apsusc.2010.12.023
dc.identifier.issn0169-4332
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/4211
dc.relation.ispartofApplied Surface Science
dc.rightsAcesso Aberto
dc.subject.otherlanguageDopant
dc.subject.otherlanguageMgO
dc.subject.otherlanguageNanoparticles
dc.subject.otherlanguageStability
dc.titleQuantification of MgO surface excess on the SnO 2 nanoparticles and relationship with nanostability and growth
dc.typeArtigo
fei.scopus.citations41
fei.scopus.eid2-s2.0-78951482928
fei.scopus.subjectMgO surfaces
fei.scopus.subjectNano-sized particles
fei.scopus.subjectSurface excess
fei.scopus.subjectTotal free energy
fei.scopus.subjectX ray fluorescence
fei.scopus.updated2024-08-01
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78951482928&origin=inward
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