GOGLIO, Graziella; KAUR, Gaganpreet; PINHO, Sonia Luzia Claro; PENIN, Nicolas; BLANDINO, Alexia; GERALDES, Carlos F. G. C.; GARCIA, Alain

doi:10.1002/ejic.201402721

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GOGLIO, Graziella
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

KAUR, Gaganpreet
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PINHO, Sonia Luzia Claro
Center for Neuroscience and Cell Biology
Department of Chemistry [CICECO]

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European Journal of Inorganic Chemistry. 2015 n° 7, p. 1243-1253

Wiley-VCH Verlag

Résumé en anglais

Monoclinic and cubic europium-doped Gd2O3 structures were selectively synthesized by the glycine–nitrate process by fine control of the synthesis temperature through the crucial fuel/oxidant ratio. The cubic phase is obtained under fuel-rich conditions, whereas stoichiometric conditions induce the simultaneous formation of cubic and monoclinic polymorphs. The samples were subjected to appropriate sintering to obtain highly crystalline and carbon-free materials. The average nanoparticle (NP) size determined by TEM for these nanopowders (23 nm) agrees with the average crystallite sizes obtained from XRD Rietveld analysis; therefore, the particles are monocrystalline. Both electron energy loss spectroscopy (EELS) and photoluminescence studies showed that the europium-doped NPs are highly luminescent, and the Eu3+ ions are homogeneously distributed over the whole material as well as over the two gadolinium crystallographic sites of the cubic phase. These fluorescent NPs exhibit relaxivities that define them as potential T1 contrast agents for further biomedical applications.< Réduire

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Doping

Lanthanides

Nanoparticles

Glycine–nitrate process

Imaging agents

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Glycine-nitrate process for the elaboration of Eu3+-doped Gd2O3 bimodal nanoparticles for biomedical applications

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