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

作　　者：Min Zhao Qingyuan Chen Yongcheng Zhu Yuehui Liu Chunchun Zhang Gang Jiang Meng Zhang Kui Yu 

机构地区：[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

出　　处：《Nano Research》2022年第3期2634-2642,共9页纳米研究（英文版）

基　　金：K.Y.thanks the National Natural Science Foundation of China(No.21773162);the Fundamental Research Funds for the Central Universities,the Applied Basic Research Programs of Science and Technology Department of Sichuan Province(No.2020YJ0326);the State Key Laboratory of Polymer Materials Engineering of Sichuan University(No.sklpme2020-2-09);the Open Project of Key State Laboratory for Supramolecular Structures and Materials of Jilin University(No.SKLSSM 2021030);the National Major Scientific and Technological Special Project for“Significant New Drugs Development”(No.2019ZX09201005-005-002);M.Z.is grateful to the National Natural Science Foundation of China(No.22002099);China Postdoctoral Science Foundation(No.2020T130441);Sichuan University postdoctoral interdisciplinary Innovation Fund,and the Open Project of Key State Laboratory for Supramolecular Structures and Materials of Jilin University(No.SKLSSM 2021032).

摘　　要：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 Cd^(2+)on PCs may be responsible to the PC-to-MSC transformation.Upon increasing the reactant concentrations or decreasing the CdCl_(2)-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.

关 键 词：aqueous magic-size cluster precursor compound formation pathway self-assembly precursor configuration 

分 类 号：O62[理学—有机化学]