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Fragmentation of Magic‐Size Cluster Precursor Compounds into Ultrasmall CdS Quantum Dots with Enhanced Particle Yield at Low Temperatures
Author(s) -
Li Lijia,
Zhang Jing,
Zhang Meng,
Rowell Nelson,
Zhang Chunchun,
Wang Shanling,
Lu Jiao,
Fan Hongsong,
Huang Wen,
Chen Xiaoqin,
Yu Kui
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202001608
Subject(s) - nucleation , quantum dot , particle size , quantum yield , yield (engineering) , nanotechnology , chemical physics , nanoparticle , materials science , colloid , nanocrystal , chemical engineering , chemistry , cluster (spacecraft) , oxide , crystallography , physics , organic chemistry , quantum mechanics , computer science , engineering , metallurgy , fluorescence , programming language
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.