Aqueous Synthesis for Highly Emissive 3-Mercaptopropionic Acid-Capped AIZS Quantum Dots.
Fiche publication
Date publication
avril 2020
Journal
Inorganic chemistry
Auteurs
Membres identifiés du Cancéropôle Est :
Pr SCHNEIDER Raphaël
Tous les auteurs :
Mrad M, Ben Chaabane T, Rinnert H, Lavinia B, Jasniewski J, Medjahdi G, Schneider R
Lien Pubmed
Résumé
Highly fluorescent and color tunable AgInS (AIS) and (AgInS)(ZnS) (AIZS) quantum dots (QDs) were prepared via a facile aqueous-phase synthesis using AgNO, In(NO), Zn(OAc), and NaS as precursors and 3-mercaptopropionic acid (3-MPA) as ligand. Produced AIZS QDs exhibit a small diameter (ca. 2.1 nm) and a cubic structure. Ag-3-MPA and In-3-MPA complexes formed during the preparation of AIS cores were found to play a key role on the fate of the reaction, and an atypical blue-shift of the photoluminescence emission was observed with the increase of the Ag/In ratio. The photoluminescence quantum yield (PL QY) of AIS QDs is modest but increased markedly after the alloying and shelling with ZnS (up to 65%). Size and composition-selective precipitations allowed to separate up to 13 fractions of AIZS QDs with exceptionally high PL QYs (up to 78%), which is the highest value reported for AIZS QDs prepared in the aqueous phase. These high PL QYs combined with their good colloidal stability and photostability make AIZS QDs of high potential as cadmium-free fluorescent probes for various applications like bioimaging or sensing.
Référence
Inorg Chem. 2020 Apr 22;: