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https://doi.org/10.1007/s12274-021-3858-1

Precursor compound enabled formation of aqueous-phase CdSe magic-size clusters at room temperature

Min Zhao1, Qingyuan Chen2, Yongcheng Zhu2, Yuehui Liu3, Chunchun Zhang4, Gang Jiang2, Meng Zhang2 (✉), and Kui Yu2,3,5 (✉)

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1 School of Chemical Engineering, Sichuan University, Chengdu 610065, China
2 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
3 Engineering Research Center in Biomaterials, Sichuan University, Chengdu 610065, China
4 Analytical & Testing Center, Sichuan University, Chengdu 610065, China
5 State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China

Keywords: aqueous magic-size cluster, precursor compound, formation pathway, self-assembly, precursor config
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The formation pathway of aqueous-phase colloidal semiconductor magic-size clusters (MSCs) remains unrevealed. In the present work, we demonstrate, for the first time, a precursor compound (PC)-enabled formation pathway of aqueous-phase CdSe MSCs exhibiting a sharp absorption peaking at about 420 nm (MSC-420). The CdSe MSC-420 is synthesized with CdCl2 and selenourea as the respective Cd and Se sources, and with 3-mercaptopropionic acid or L-cysteine as a ligand. Absorption featureless CdSe PCs form first in the aqueous reaction batches, which transform to MSC-420 in the presence of primary amines. The coordination between primary amine and Cd2+ on PCs may be responsible to the PC-to-MSC transformation. Upon increasing the reactant concentrations or decreasing the CdCl2-ligand feed molar ratios, the Cd precursor self-assembles into large aggregates, which may encapsulate the resulting CdSe PCs and inhibit their transformation to MSC-420. The present study sheds essential light on the syntheses and formation mechanisms of nanocrystals.
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Precursor compound enabled formation of aqueous-phase CdSe magic-size clusters at room temperature. Nano Res. https://doi.org/10.1007/s12274-021-3858-1

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