Development of aqueous-phase CdSeS magic-size clusters at room temperature and quantum dots at elevated temperatures  

作　　者：Yao Jiang Zhe Wang Shasha Wang Chunchun Zhang Chaoran Luan Xiaoqin Chen Kui Yu 

机构地区：[1]Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,China [2]Engineering Research Center in Biomaterials,Sichuan University,Chengdu 610065,China [3]Analytical&Testing Center,Sichuan University,Chengdu 610065,China [4]College of Biomedical Engineering,Sichuan University,Chengdu 610065,China

出　　处：《Nano Research》2024年第12期10529-10535,共7页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(NSFC)(No.22275126);the Natural Science Foundation of Sichuan Province(No.2023NSFSC0634);the Open Project of Key State Laboratory for Supramolecular Structures and Materials of Jilin University(No.SKLSSM 2024036);gratitude for NSFC(No.32000934)and the Natural Science Foundation of Sichuan Province(No.24NSFSC6433);for NSFC(No.22305162);the discussion on experimental data.For TEM,we thank College of Chemistry of Sichuan University(Dr.Feng Yang).

摘　　要：Little is known about the synthesis of colloidal ternary semiconductor magic-size clusters(MSCs)and quantum dots(QDs)in an aqueous environment.We report here the first synthesis of aqueous-phase CdSeS MSC-380(displaying sharp optical absorption peaking at~380 nm)at room temperature and QDs at elevated temperatures.The reaction contains CdCl2·2.5H_(2)O,3-mercaptopropionic acid(MPA,HS-(CH_(2))2-COOH),selenourea(SeU,NH_(2)-C(Se)-NH_(2)),and thioacetamide(TAA,CH3-C(S)-NH_(2)).Prior to the nucleation and growth(N/G)of QDs,there are clusters formed at 25℃.The prenucleation-stage clusters are the precursor compound of CdSeS MSC-380(PC-380).The PC is relatively transparent in optical absorption;in the presence of a primary amine butylamine(BTA,CH3-(CH_(2))3-NH_(2)),the PC transforms to absorbing CdSeS MSC-380.At 80℃,the PC decreases and the N/G of CdSeS QDs appears.The present study paves the way to the aqueous-phase synthesis of ternary CdSeS MSCs and QDs,providing an in-depth understanding of the cluster formation in the prenucleation stage of CdSeS QDs.

关 键 词：aqueous phase precursor compound(PC) magic-size cluster(MSC) quantum dot(QD) cadmium selenide sulfide 

分 类 号：O62[理学—有机化学]