Core-shell Au/Fe3O4 nanocomposite synthesized by thermal decomposition method : structural, optical, and magnetic properties

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorOliveira-Filho, G.B.-
Autor(es): dc.creatorAtoche Medrano, Jason Jerry-
Autor(es): dc.creatorAragon, F.F.H.-
Autor(es): dc.creatorMantilla Ochoa, J.C.-
Autor(es): dc.creatorSalazar, D.G. Pacheco-
Autor(es): dc.creatorSilva, S.W. da-
Autor(es): dc.creatorHuamaní Coaquira, José Antonio-
Data de aceite: dc.date.accessioned2024-10-23T16:41:39Z-
Data de disponibilização: dc.date.available2024-10-23T16:41:39Z-
Data de envio: dc.date.issued2022-05-04-
Data de envio: dc.date.issued2022-05-04-
Data de envio: dc.date.issued2021-10-15-
Fonte completa do material: dc.identifierhttps://repositorio.unb.br/handle/10482/43641-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.apsusc.2021.150290-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/914873-
Descrição: dc.descriptionCore-shell structure Au@Fe3O4 nanoparticles was synthesized via a thermal decomposition method, evidencing through interplanar atomic distances of ~ 0.23 nm and ~ 0.48 nm finding in the center and the shell of the particles, matching to the (1 1 1) Au and (1 1 1) magnetite planes, respectively. The nanocomposite has an average diameter of the core of ~ 10.5 nm and a thickness of the shell of ~1.85 nm, accessed by TEM. X-ray diffraction carried out on the sample shows the crystal structure of fcc Au and fcc Fe3O4 without a spurious crystalline phase. Besides, Rietveld refinement displays an outer diameter of ~ 8.1 and ~ 12.3 for the core and shell, respectively, the latter using the Scherrer constant of 0.9 and 1.43, respectively. The UV–vis characterization result shows a surface plasmon resonance spectra of Au@Fe3O4 nanoparticles at ~ 540 nm, which advise a successful core–shell coupling of Au and the Fe3O4. Finally, the magnetic response displays a system with a superparamagnetic state at room temperature and with a distribution of blocking temperatures associated with the enhanced surface contribution related to the hollow magnetite structure's inner and outer surface. From the mean TB, the effective magnetic anisotropy J/m3 was obtained, which is in agreement with the expected for the magnetite phase.-
Publicador: dc.publisherElsevier-
Relação: dc.relationhttps://www.sciencedirect.com/science/article/pii/S0169433221013659?via%3Dihub-
Direitos: dc.rightsAcesso Restrito-
Palavras-chave: dc.subjectNanopartículas-
Palavras-chave: dc.subjectSuperparamagnetismo-
Palavras-chave: dc.subjectAnisotropia-
Título: dc.titleCore-shell Au/Fe3O4 nanocomposite synthesized by thermal decomposition method : structural, optical, and magnetic properties-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional – UNB

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