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Aqueous synthesis of highly luminescent glutathione-capped Mn2+-doped ZnS quantum dots

Abstract : 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 Mn2+-related orange luminescence with very low surface defect density. The highest photoluminescence was observed for a Mn2+ to Zn2+ 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.
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https://hal.archives-ouvertes.fr/hal-01056211
Contributor : Raphaël Schneider <>
Submitted on : Monday, August 18, 2014 - 10:49:38 AM
Last modification on : Monday, April 6, 2020 - 2:44:03 PM

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Oleksii Kolmykov, Joël Coulon, Jacques Lalevée, Halima Alem, Ghouti Medjahdi, et al.. Aqueous synthesis of highly luminescent glutathione-capped Mn2+-doped ZnS quantum dots. Materials Science and Engineering: C, Elsevier, 2014, 44, pp.17-23. ⟨10.1016/j.msec.2014.07.064⟩. ⟨hal-01056211⟩

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