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Characterization of multifunctional β-NaEuF4/NaGdF4 core–shell nanoparticles with narrow size distribution

Abstract : The properties of β-NaEuF4/NaGdF4 core–shell nanocrystals have been thoroughly investigated. Nanoparticles with narrow size distribution and an overall diameter of ∼22 nm have been produced with either small β-NaEuF4 cores (∼3 nm diameter) or large β-NaEuF4 cores (∼18 nm diameter). The structural properties and core–shell formation are investigated by X-ray diffraction, transmission electron microscopy and electron paramagnetic resonance, respectively. Optical luminescence measurements and X-ray photoelectron spectroscopy are employed to gain information about the optical emission bands and valence states of the rare earth constituents. Magnetic characterization is performed by SQUID and X-ray magnetic circular dichroism measurements at the rare earth M4,5 edges. The characterization of the core–shell nanoparticles by means of these complementary techniques demonstrates that partial intermixing of core and shell materials takes place, and a significant fraction of europium is present in the divalent state which has significant influence on the magnetic properties. Hence, we obtained a combination of red emitting Eu3+ ions and paramagnetic Gd3+ ions, which may be highly valuable for potential future applications.
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Submitted on : Friday, June 2, 2017 - 9:14:18 AM
Last modification on : Thursday, February 25, 2021 - 10:00:02 AM

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Lilli Schneider, Thorben Rinkel, Benjamin Voß, Artur Chrobak, Johann P. Klare, et al.. Characterization of multifunctional β-NaEuF4/NaGdF4 core–shell nanoparticles with narrow size distribution. Nanoscale, Royal Society of Chemistry, 2015, pp.2832-2843. ⟨10.1039/C5NR06915G⟩. ⟨hal-01531876⟩



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