期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 29, 页码 12013-12021出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202001608
关键词
cadmium sulfide; crystal growth; magic-size clusters; nucleation; quantum dots
资金
- National Natural Science Foundation of China (NSFC) [21773162]
- State Key Laboratory of Supramolecular Structures and Materials of Jilin University [SKLSSM 201935]
- State Key Laboratory of Polymer Materials Engineering of Sichuan University [sklpme2018-2-08]
- National Major Scientific and Technological Special Project for Significant New Drugs Development [2019ZX09201005-005-002, 2019ZX09201005-005-001]
Colloidal small-size CdS quantum dots (QDs) are produced usually with low particle yield, together with side products such as the particular precursor compounds (PCs) of magic-size clusters (MSC). Here, we report our synthesis of small-size CdS QDs without the coexistence of the PC and thus with enhanced particle yield. For a conventional reaction of cadmium oleate (Cd(OA)(2)) and sulfur (S) in 1-octadecene (ODE), we show that after the formation of the PC in the pre-nucleation stage, the addition of tri-n-octylphosphine oxide (TOPO) facilitates the production of small-size QDs. We demonstrate that TOPO fragmentizes the PC that have formed, which enables the nucleation and growth of small-size QDs even at room temperature. Our findings introduce a new approach to making small-size QDs without the coexistence of the PC and with improved particle yield. Providing experimental evidence for the two-pathway model proposed for the pre-nucleation stage of colloidal binary QDs, the present study aids in the advance of non-classical nucleation theory.
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