Aqueous synthesis of highly luminescent glutathione-capped Mn(2)(+)-doped ZnS quantum dots.
Fiche publication
Date publication
novembre 2014
Auteurs
Membres identifiés du Cancéropôle Est :
Pr SCHNEIDER Raphaël, Pr ALEM-MARCHAND Halima
Tous les auteurs :
Kolmykov O, Coulon J, Lalevee J, Alem H, Medjahdi G, Schneider R
Lien Pubmed
Résumé
In this paper, an aqueous-based route has been developed to prepare highly luminescent glutathione (GSH)-capped Mn-doped ZnS quantum dots (QDs). The dots obtained have an average diameter of 4.3 nm and exhibit the Mn(2+)-related orange luminescence with very low surface defect density. The highest photoluminescence was observed for a Mn(2+) to Zn(2+) molar ratio of 3%. Consecutive overcoating of the Mn:ZnS@GSH QDs by a ZnS shell was done, and the core/shell structured QDs exhibit a PL quantum yield of 23%. Transmission electron microscopy, X-ray powder diffraction, electron spin resonance, X-ray photoelectron spectroscopy, UV-visible spectroscopy and spectrofluorometry have been used to characterize the crystal structure, the doping status, and the optical properties of the doped-QDs. Our systematic investigation shows that Mn:ZnS/ZnS@GSH QDs are highly promising fluorescent labels in biological applications.
Référence
Mater Sci Eng C Mater Biol Appl. 2014 Nov;44:17-23