@article{Zhao2022, 
author = {Min Zhao and Qingyuan Chen and Yongcheng Zhu and Yuehui Liu and Chunchun Zhang and Gang Jiang and Meng Zhang and Kui Yu},
title = {Precursor compound enabled formation of aqueous-phase CdSe magic-size clusters at room temperature},
year = {2022},
journal = {Nano Research},
volume = {15},
number = {3},
pages = {2634-2642},
keywords = {self-assembly, aqueous magic-size cluster, precursor compound, formation pathway, precursor configuration},
url = {https://www.sciopen.com/article/10.1007/s12274-021-3858-1},
doi = {10.1007/s12274-021-3858-1},
abstract = {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.}
}