TY  - JOUR
AU  - Jiang, Yao
AU  - Wang, Zhe
AU  - Wang, Shasha
AU  - Zhang, Chunchun
AU  - Luan, Chaoran
AU  - Chen, Xiaoqin
AU  - Yu, Kui
PY  - 2024
TI  - Development of aqueous-phase CdSeS magic-size clusters at room temperature and quantum dots at elevated temperatures
JO  - Nano Research
SN  - 1998-0124
SP  - 10529
EP  - 10535
VL  - 17
IS  - 12
AB  - Little is known about the synthesis of colloidal ternary semiconductor magic-size clusters (MSCs) and quantum dots (QDs) in an aqueous environment. We report here the first synthesis of aqueous-phase CdSeS MSC-380 (displaying sharp optical absorption peaking at ~ 380 nm) at room temperature and QDs at elevated temperatures. The reaction contains CdCl2·2.5H2O, 3-mercaptopropionic acid (MPA, HS−(CH2)2−COOH), selenourea (SeU, NH2−C(Se)−NH2), and thioacetamide (TAA, CH3−C(S)−NH2). Prior to the nucleation and growth (N/G) of QDs, there are clusters formed at 25 °C. The prenucleation-stage clusters are the precursor compound of CdSeS MSC-380 (PC-380). The PC is relatively transparent in optical absorption; in the presence of a primary amine butylamine (BTA, CH3−(CH2)3−NH2), the PC transforms to absorbing CdSeS MSC-380. At 80 °C, the PC decreases and the N/G of CdSeS QDs appears. The present study paves the way to the aqueous-phase synthesis of ternary CdSeS MSCs and QDs, providing an in-depth understanding of the cluster formation in the prenucleation stage of CdSeS QDs.
UR  - https://doi.org/10.1007/s12274-024-6884-y
DO  - 10.1007/s12274-024-6884-y