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

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Autor(es): dc.contributorAv Independencia SN-
Autor(es): dc.contributorInstitute of Physics-
Autor(es): dc.contributorUniversidade Federal de São Carlos (UFSCar)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorGenomic Sciences and Biotechnology-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorAragón, F. F.H.-
Autor(es): dc.creatorVillegas-Lelovsky, L.-
Autor(es): dc.creatorParizaka, J. G.-
Autor(es): dc.creatorZela, E. G.-
Autor(es): dc.creatorBendezu, R.-
Autor(es): dc.creatorGallegos, R. O.-
Autor(es): dc.creatorPacheco-Salazar, D. G.-
Autor(es): dc.creatorda Silva, S. W.-
Autor(es): dc.creatorCohen, R.-
Autor(es): dc.creatorNagamine, L. C.C.M.-
Autor(es): dc.creatorCoaquira, J. A.H.-
Autor(es): dc.creatorMorais, P. C.-
Data de aceite: dc.date.accessioned2025-08-21T23:47:19Z-
Data de disponibilização: dc.date.available2025-08-21T23:47:19Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-02-07-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1039/d3ma00053b-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/248499-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/248499-
Descrição: dc.descriptionOxide-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.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionUniversidad Nacional de San Agustín de Arequipa Av Independencia SN-
Descrição: dc.descriptionUniversity of Brasília Institute of Physics-
Descrição: dc.descriptionDepartamento de Física Centro de Ciências Exatas e de Tecnologia Universidade Federal de São Carlos, SP-
Descrição: dc.descriptionInstituto de Física Universidade de São Paulo, SP-
Descrição: dc.descriptionCatholic University of Brasília Genomic Sciences and Biotechnology, DF-
Descrição: dc.descriptionPhysics Department IGCE Paulista State University, CEP 13506-900, SP-
Descrição: dc.descriptionPhysics Department IGCE Paulista State University, CEP 13506-900, SP-
Formato: dc.format1389-1402-
Idioma: dc.languageen-
Relação: dc.relationMaterials Advances-
???dc.source???: dc.sourceScopus-
Título: dc.titleEvidence of progressive Fe2+ to Fe3+oxidation in Fe2+-doped ZnO nanoparticles-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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