Tuning the magnetic properties of Sn1-x-yCe4+xCe3+yO2 nanoparticles: an experimental and theoretical approach

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniv Nacl San Agustin Arequipa-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorUniversidade Federal de São Carlos (UFSCar)-
Autor(es): dc.contributorUniversidade Estadual de Campinas (UNICAMP)-
Autor(es): dc.contributorUniversidade de Brasília (UnB)-
Autor(es): dc.creatorAragon, F. F. H.-
Autor(es): dc.creatorVillegas-Lelovsky, L. [UNESP]-
Autor(es): dc.creatorCabral, L.-
Autor(es): dc.creatorLima, M. P.-
Autor(es): dc.creatorMesquita, A. [UNESP]-
Autor(es): dc.creatorCoaquira, J. A. H.-
Data de aceite: dc.date.accessioned2022-02-22T00:58:39Z-
Data de disponibilização: dc.date.available2022-02-22T00:58:39Z-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-06-25-
Data de envio: dc.date.issued2021-03-07-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1039/d0na00700e-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/210137-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/210137-
Descrição: dc.descriptionDuring the last decade, there was a substantial increase in the research on metal-doped oxide semiconductor nanoparticles due to advances in the engineering of nanomaterials and their potential application in spintronics, biomedicine and photocatalysis fields. In this regard, doping a nanomaterial is a powerful tool to tune its physicochemical properties. The aim of this work is to shine a new light on the role of the neighbouring elements on the oxidation state of the Ce-impurity, from both experimental and theoretical points of view. Herein, we present an accurate study of the mechanisms involved in the oxidation states of the Ce-ions during the doping process of SnO2 nanoparticles (NPs) prepared by the polymeric precursor method. X-ray diffraction measurements have displayed the tetragonal rutile-type SnO2 phase in all samples. However, the Bragg's peak (111) and (220) located at 2 theta similar to 29 degrees and similar to 47 degrees evidence the formation of a secondary CeO2 phase for samples with Ce content up to 10%. X-ray absorption near-edge structure (XANES) measurements, at Ce L3 edge, were performed on the NPs as a function of Ce content. The results show, on one side, the coexistence of Ce3+ and Ce4+ states in all samples; and on the other side, a clear reduction in the Ce3+ population driven by the increase of Ce content. It is shown that this is induced by the neighboring cation, and confirmed by magnetic measurements. The monotonic damping of the Ce3+/Ce4+ ratio experimentally, was connected with theoretical calculations via density functional theory by simulating a variety of point defects composed of Ce impurities and surrounding oxygen vacancies. We found that the number of oxygen vacancies around the Ce-ions is the main ingredient to change the Ce oxidation state, and hence the magnetic properties of Ce-doped SnO2 NPs. The presented results pave the way for handling the magnetic properties of oxides through the control of the oxidation state of impurities.-
Descrição: dc.descriptionCONCYTEC -FONDECYT-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFAPDF-
Descrição: dc.descriptionUniv Nacl San Agustin Arequipa, Lab Peliculas Delgadas, Escuela Profes Fis, Ave Independencia S-N, Arequipa, Peru-
Descrição: dc.descriptionUniv Estadual Paulista, Dept Fis, IGCE, BR-13506900 Rio Claro, SP, Brazil-
Descrição: dc.descriptionUniv Fed Sao Carlos, Ctr Ciencias Exatas & Tecnol, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil-
Descrição: dc.descriptionUniv Estadual Campinas, Inst Fis Gleb Wataghin IFGW, BR-13083859 Campinas, SP, Brazil-
Descrição: dc.descriptionUniv Brasilia, Nucleo Fis Aplicada, Inst Fis, BR-70910900 Brasilia, DF, Brazil-
Descrição: dc.descriptionUniv Estadual Paulista, Dept Fis, IGCE, BR-13506900 Rio Claro, SP, Brazil-
Descrição: dc.descriptionCONCYTEC -FONDECYT: E038-01-
Descrição: dc.descriptionCONCYTEC -FONDECYT: 07-2019-FONDECYT-BM-INC-
Descrição: dc.descriptionCAPES: 88887.319028/2019-00-
Descrição: dc.descriptionFAPESP: 2018/20729-9-
Descrição: dc.descriptionFAPESP: 17/02317-2-
Descrição: dc.descriptionFAPESP: 2013/12993-4-
Descrição: dc.descriptionCNPq: 301455/2017-1-
Descrição: dc.descriptionCNPq: 443652/2018-0-
Descrição: dc.descriptionFAPDF: 00193.0000151/2019-20-
Formato: dc.format1484-1495-
Idioma: dc.languageen-
Publicador: dc.publisherRoyal Soc Chemistry-
Relação: dc.relationNanoscale Advances-
???dc.source???: dc.sourceWeb of Science-
Título: dc.titleTuning the magnetic properties of Sn1-x-yCe4+xCe3+yO2 nanoparticles: an experimental and theoretical approach-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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