Simple Synthesis of Highly Luminescent Water-Soluble CdTe Quantum Dots with Controllable Surface Functionality
journal contributionposted on 2016-02-22, 16:36 authored by Ding Zhou, Min Lin, Zhaolai Chen, Haizhu Sun, Hao Zhang, Hongchen Sun, Bai Yang
Highly luminescent quantum dots (QDs) could be synthesized in “conical flask” now. Through a room-temperature N2H4-promoted strategy, water-soluble CdTe QDs were facilely synthesized by a stepwise addition of raw materials in one pot. No prepreparation of precursors, pH adjustment, heating, and even N2 protection were required. Just by adjusting the feed ratio of the reagents, different-sized QDs were easily obtained within a shortened time. More importantly, besides conventional thiol-ligands, such as thioglycolic acid (TGA), 3-mercaptopropionic acid (MPA), 1-thioglycerol (TG), 2-mercaptoethylamine (MA), glutathione (GSH), and l-cysteine (LCS), some special mercapto-compounds, for instance, 4-mercaptobenzoic acid (MBA), per-6-thio-α-cyclodextrin (α-CD-SH), and per-7-thio-β-cyclodextrin (β-CD-SH), were also practicable, which were impossible in the conventional reflux method because of the poor water-solubility of them. Furthermore, a spontaneous aggregation of MA-stabilized QDs was observed after synthesis, which facilitated the separation of QDs and recycle of N2H4-containing growth solution.