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Preparation and Physicochemical Characteristics of Luminescent Apatite-Based Colloids

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CIRIMAT Carnot Institute, University of Toulouse, CNRS/INPT/UPS, ENSIACET, 4 allée Emile Monso, BP 44362, 31432 Toulouse cedex 4, France, CIRIMAT Carnot Institute, University of Toulouse, CNRS/INPT/UPS, LCMIE, Université Paul Sabatier, 118 route de Narbonne, Bât. 2R1, 31062 Toulouse cedex 9, France, and CEMES 29, rue Jeanne Marvig, BP 94347, 31055 Toulouse cedex 4, France
* To whom correspondence should be addressed. Phone: +33 (0)5 34 32 34 50 (A.A.), +33 (0)5 34 32 34 11 (C.D.). Fax: +33 (0)5 34 32 33 99 (A.A.), +33 (0)5 34 32 33 99 (C.D.). E-mail: [email protected] (A.A.), [email protected] (C.D.).
†CIRIMAT Carnot Institute, University of Toulouse, CNRS/INPT/UPS, ENSIACET.
‡CIRIMAT Carnot Institute, University of Toulouse, CNRS/INPT/UPS, LCMIE, Université Paul Sabatier.
§CEMES 29.
Cite this: J. Phys. Chem. C 2010, 114, 7, 2918–2924
Publication Date (Web):February 2, 2010
Copyright © 2010 American Chemical Society

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    Luminescent colloidal nanosystems based on europium-doped biomimetic apatite were prepared and investigated. The colloids were synthesized by soft chemistry in the presence of a phospholipid moiety, 2-aminoethylphosphoric acid (AEP), with varying europium doping rates. Physicochemical features, including compositional, structural, morphological, and luminescence properties, were examined. Experimental evidence showed that suspensions prepared from an initial Eu/(Eu + Ca) molar ratio up to 2% consisted of single-phased biomimetic apatite nanocrystals covered with AEP molecules. The mean particle size was found to depend closely on the AEP content, enabling the production of apatite colloids with a controlled size down to ca. 30 nm. The colloids showed luminescence properties typical of europium-doped systems with narrow emission bands and long luminescence lifetimes of the order to the millisecond, and the data suggested the location of Eu3+ ions in a common crystallographic environment for all the colloids. These systems, stable over time and capable of being excited in close-to-visible or visible light domains, may raise interest in the future in the field of medical imaging.

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    Emission spectra of apatite colloids doped with Eu/(Ca + Eu) initial molar ratios of 1, 1.5, and 2% Eu under excitation at 392.8 nm; luminescence decay profiles of the 5D0 (Eu3+) level for three apatite colloids—1, 1.5, and 2% Eu—under excitation at 392.8 nm and at ambient temperature; and TEM micrograph for apatite colloids prepared from Eu/(Ca + Eu) = 1.5%. This material is available free of charge via the Internet at

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