Bifunctional optical and magnetic nanocomposites containing Fe3O4 grafted inorganic matrices and functionalize with RE3+ complexes
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2016
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INTERNATIONAL CONFERENCE ON EXCITED STATES OF TRANSITION ELEMENTS, 6th
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The design of bifunctional magnetic luminescent nanomaterials containing Fe3O4
functionalized with rare earth ion complexes of calixarene and β-diketonate ligands is
reported. Their preparation is accessible through a facile onepot method. These novel
Fe3O4@calix-Eu(TTA) (TTA = thenoyltrifluoroacetonate) and Fe3O4@calix-Tb(ACAC)
(ACAC = acetylacetonate) magnetic luminescent nanomaterials show interesting
superparamagnetic and photonic properties. Besides, the preparation of bifunctional
nanocomposites, co-assembling photonic (RE3+) and magnetic (Fe3O4) features into single
entity nanostructures is reported through a facile method, using Fe3O4 as core nanoparticles,
which were coated with SiO2 shell and further grafted with Eu3+ and Tb3+ complexes. The
sophisticated structural features and morphologies of the core-shell Fe3O4@SiO2-(TTA-RE-L)
nanomaterials were studied by SAXS analysis.
The core mean size , shell thickness , cluster
size ξ and fractal dimension DF were determined by
fitting the experimental SAXS data, corroborating
through Transmission Electron Microscopy images. The
DC magnetic properties at temperatures of 2 and 300 K
were explored in support to the structural conclusions
from SAXS and TEM analyses. The magnetic
contributions of the RE3+ ions to the magnetizations of
the Eu3+ and Tb3+ nanocomposites were discussed. The
photoluminescence properties of the Eu3+ and Tb3+
nanocomposites based on the emission spectral data and
luminescence decay curves were studied (Fig.1). The
experimental intensity parameters (), lifetimes (),
emission quantum efficiencies () as well as radiative (Arad) and non-radiative (Anrad) decay
rates were calculated and discussed, in addition, the structural conclusions from the values of
the 4f-4f intensity parameters in the case of the Eu3+ ion. These novel Eu3+ and Tb3+
nanocomposites may act as red and green emitting layers for magnetic and light converting
molecular devices.
Como referenciar
KHAN, L.U.; MURACA, D.; BRITO, H.F.; MOSCOSO-LONDONO, O.; FELINTO, M.C.F.C.; PIROTA, K.R.; TEOTONIO, E.E.S.; MALTA, O.L. Bifunctional optical and magnetic nanocomposites containing Fe3O4 grafted inorganic matrices and functionalize with RE3+ complexes. In: INTERNATIONAL CONFERENCE ON EXCITED STATES OF TRANSITION ELEMENTS, 6th, August 21-26, 2016, Polanica Zdrój, Poland. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/27394. Acesso em: 30 Dec 2025.
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.