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

Oliveira-Filho, G.B.; Atoche Medrano, Jason Jerry; Aragon, F.F.H.; Mantilla Ochoa, J.C.; Salazar, D.G. Pacheco; Silva, S.W. da; Huamaní Coaquira, José Antonio

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Campo DC	Valor	Idioma
dc.contributor.author	Oliveira-Filho, G.B.	-
dc.contributor.author	Atoche Medrano, Jason Jerry	-
dc.contributor.author	Aragon, F.F.H.	-
dc.contributor.author	Mantilla Ochoa, J.C.	-
dc.contributor.author	Salazar, D.G. Pacheco	-
dc.contributor.author	Silva, S.W. da	-
dc.contributor.author	Huamaní Coaquira, José Antonio	-
dc.date.accessioned	2022-05-04T20:29:55Z	-
dc.date.available	2022-05-04T20:29:55Z	-
dc.date.issued	2021-10-15	-
dc.identifier.citation	OLIVEIRA-FILHO, G. B. et al. Core-shell Au/Fe3O4 nanocomposite synthesized by thermal decomposition method: structural, optical, and magnetic properties. Applied Surface Science, v. 563, art. 150290, p. 1-6, out. 2021. DOI 10.1016/j.apsusc.2021.150290. Disponível em: https://doi.org/10.1016/j.apsusc.2021.150290. Acesso em: 04 maio 2022.	pt_BR
dc.identifier.uri	https://repositorio.unb.br/handle/10482/43641	-
dc.language.iso	Inglês	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Acesso Restrito	pt_BR
dc.title	Core-shell Au/Fe3O4 nanocomposite synthesized by thermal decomposition method : structural, optical, and magnetic properties	pt_BR
dc.type	Artigo	pt_BR
dc.subject.keyword	Nanopartículas	pt_BR
dc.subject.keyword	Superparamagnetismo	pt_BR
dc.subject.keyword	Anisotropia	pt_BR
dc.identifier.doi	https://doi.org/10.1016/j.apsusc.2021.150290	pt_BR
dc.relation.publisherversion	https://www.sciencedirect.com/science/article/pii/S0169433221013659?via%3Dihub	pt_BR
dc.description.abstract1	Core-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.	pt_BR
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