Fragmentation of Magic-Size Cluster Precursor Compounds into Ultrasmall CdS Quantum Dots with Enhanced Particle Yield at Low Temperatures.,Angewandte Chemie International Edition

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Fragmentation of Magic-Size Cluster Precursor Compounds into Ultrasmall CdS Quantum Dots with Enhanced Particle Yield at Low Temperatures.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-05-11 , DOI: 10.1002/anie.202001608
Lijia Li ₁ , Jing Zhang ₂ , Meng Zhang ₂ , Nelson Rowell ₃ , Chunchun Zhang ₄ , Shanling Wang ₄ , Jiao Lu ₁ , Hongsong Fan ₁ , Wen Huang _{5,

6} , Xiaoqin Chen ₁ , Kui Yu _{1,

2,

7}

Affiliation

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.

中文翻译：

魔术大小的簇前体化合物在低温下破碎成具有增强的粒子产率的超小CdS量子点。

胶体小尺寸CdS量子点（QD）通常以较低的颗粒收率生产，并与副产物如魔术大小簇（MSC）的特定前体化合物（PC）一起产生。在这里，我们报告了在没有PC并存的情况下，小型CdS QD的合成，从而提高了颗粒产率。对于油酸镉（Cd（OA）₂）和1-十八碳烯（ODE）中的硫（S），我们表明在预成核阶段形成PC后，添加三正辛基氧化膦（TOPO）有助于生产小型QD 。我们证明了TOPO可以使已形成的PC碎片化，即使在室温下也可以使小型QD形核和生长。我们的发现引入了一种新的方法来制造小尺寸的量子点，而无需PC并存，并提高了颗粒产量。本研究为胶体二元量子点的预成核阶段提出的两种途径模型提供了实验证据，该研究有助于非经典成核理论的发展。

更新日期：2020-07-06

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