Synthesis and characterization of Fe3O4-HfO2 nanoparticles by hyperfine interactions measurements
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2021
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Nanoparticles (NPs) that combine biocompatibility and enhanced physical characteristics for biomedical applications are currently an area
of intense scientific research. Hafnium oxide NPs are an innovative approach in the anticancer treatment by radiotherapy due to their low
toxicity and enhancement of local dose in the tumor reducing the total radiation dose for the patient. The combination of this property with
the excellent magnetic hyperthermia performance of Fe3O4 NPs can produce a promising nanomaterial for cancer therapy. In this work, we
attempted to synthesize nanoscale samples of HfO2 doped with nominal 10 at.% Fe, and Fe3O4 doped with Hf at 10 at.% level using simple
chemical routes. The crystal structure of the samples was characterized by X-ray diffraction. The material was irradiated with neutrons in
a research reactor, the nuclear reaction 180Hf(n, γ)181Hf yielding the probe nucleus 181Hf(181Ta) used in the perturbed angular correlations
experiments to measure hyperfine interactions. Despite their immediate response to the external magnetic field, at local level both samples
showed only electric quadrupole interaction typical of the monoclinic hafnia indicating that Fe replaces Hf in HfO2 NPs, but, rather than
substituting Fe, Hf enters magnetite in the form of HfO2 clusters. Transmission Electron Microscopy was exploited to study the morphology
of these complex systems, as well as to localize hafnia clusters and understand the nature of their coupling to Fe3O4 specks.
Como referenciar
SALES, T.S.N.; BURIMOVA, A.; RODRIGUES, P.S.; MATOS, I.T.; CABRERA-PASCA, G.A.; SAXENA, R.N.; PEREIRA, L.F.D.; OTUBO, L.; CARBONARI, A.W. Synthesis and characterization of Fe3O4-HfO2 nanoparticles by hyperfine interactions measurements. AIP Advances, v. 11, n. 1, p. 015047-1 - 015047-4, 2021. DOI: 10.1063/9.0000235. Disponível em: http://repositorio.ipen.br/handle/123456789/31980. Acesso em: 24 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.