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Journal Articles Journal of Physical Chemistry C Year : 2010

Preparation and physico-chemical characteristics of luminescent apatite-based colloids

Abstract

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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Dates and versions

hal-03474580 , version 1 (10-12-2021)

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Ahmed Al-Kattan, Pascal Dufour, Jeannette Dexpert-Ghys, Christophe Drouet. Preparation and physico-chemical characteristics of luminescent apatite-based colloids. Journal of Physical Chemistry C, 2010, 114 (7), pp.2918-2924. ⟨10.1021/jp910923g⟩. ⟨hal-03474580⟩
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