Evidence of progressive Fe2+ to Fe3+oxidation in Fe2+-doped ZnO nanoparticles

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dc.contributor.authorAragón, F. F.H.
dc.contributor.authorVillegas-Lelovsky, L. [UNESP]
dc.contributor.authorParizaka, J. G.
dc.contributor.authorZela, E. G.
dc.contributor.authorBendezu, R.
dc.contributor.authorGallegos, R. O.
dc.contributor.authorPacheco-Salazar, D. G.
dc.contributor.authorda Silva, S. W.
dc.contributor.authorCohen, R.
dc.contributor.authorNagamine, L. C.C.M.
dc.contributor.authorCoaquira, J. A.H.
dc.contributor.authorMorais, P. C.
dc.contributor.institutionAv Independencia SN
dc.contributor.institutionInstitute of Physics
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionGenomic Sciences and Biotechnology
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2023-07-29T13:45:44Z
dc.date.available2023-07-29T13:45:44Z
dc.date.issued2023-02-08
dc.description.abstractOxide-diluted magnetic semiconductors have received considerable attention in diverse scientific and technological fields because they combine the optoelectronic properties of the hosting semiconductor with the magnetic properties of the metal dopant. In this report, the role of Fe doping on the structural, vibrational, optical, hyperfine, and magnetic properties of Fe-doped ZnO nanoparticles (Zn1−xFexO) synthesized via a polymeric precursor method is presented. Our findings display that the crystallite size decreases from ∼23 nm (x = 0.000) to ∼8 nm (x = 0.200) as the Fe-content (x) is increased. From the XRD data analysis, our results suggest an isovalent solid solution between Fe2+ and Zn2+ ions for lower Fe-content (up to 0.075) and aliovalent solution (Fe3+ and Zn2+ ions) for higher Fe-content. Elliot's theory was used to assess the band gap energy of Eg ∼ 3.4 eV, and an exciton binding energy of Eb ∼ 66 meV for the undoped sample. The excitonic peak exhibits a broadening trend with increasing Fe-content, suggesting disorder enhancement in the ZnO matrix. Besides, FTIR data analysis suggests that the Zn-O bond length increases with Fe-content up to 0.075 and decreases above this value. The intensity ratio of the O-H and Zn-O modes shows a discontinuity as the Fe-content is increased. Room temperature Mössbauer spectra carried out for samples with x = 0.050, 0.075, and 0.200 show that the isomer shift and quadrupole splitting increase with the Fe-content, in agreement with the structural properties. Magnetic measurements suggest that the iron ions stabilize as Fe2+ in samples with low Fe-content and then as Fe3+ in samples with high Fe-content. Besides, the occurrence of short-range antiferromagnetic interactions was determined, which becomes stronger as the Fe-content is increased.en
dc.description.affiliationUniversidad Nacional de San Agustín de Arequipa Av Independencia SN
dc.description.affiliationUniversity of Brasília Institute of Physics
dc.description.affiliationDepartamento de Física Centro de Ciências Exatas e de Tecnologia Universidade Federal de São Carlos, SP
dc.description.affiliationInstituto de Física Universidade de São Paulo, SP
dc.description.affiliationCatholic University of Brasília Genomic Sciences and Biotechnology, DF
dc.description.affiliationPhysics Department IGCE Paulista State University, CEP 13506-900, SP
dc.description.affiliationUnespPhysics Department IGCE Paulista State University, CEP 13506-900, SP
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent1389-1402
dc.identifierhttp://dx.doi.org/10.1039/d3ma00053b
dc.identifier.citationMaterials Advances, v. 4, n. 5, p. 1389-1402, 2023.
dc.identifier.doi10.1039/d3ma00053b
dc.identifier.issn2633-5409
dc.identifier.scopus2-s2.0-85149815545
dc.identifier.urihttp://hdl.handle.net/11449/248499
dc.language.isoeng
dc.relation.ispartofMaterials Advances
dc.sourceScopus
dc.titleEvidence of progressive Fe2+ to Fe3+oxidation in Fe2+-doped ZnO nanoparticlesen
dc.typeArtigo
unesp.author.orcid0000-0001-5336-1131 0000-0001-5336-1131[1]
unesp.author.orcid0000-0002-3408-3612 0000-0002-3408-3612[2]
unesp.author.orcid0000-0001-7331-2273[6]
unesp.author.orcid0000-0003-4685-2244[7]
unesp.author.orcid0000-0003-4483-9687[8]
unesp.author.orcid0000-0001-9722-7989[9]
unesp.author.orcid0000-0001-6907-9579[10]
unesp.author.orcid0000-0002-8782-6838[11]
unesp.author.orcid0000-0001-6181-7709 0000-0001-6181-7709[12]

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