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Research Article

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

Yao Jiang1, Zhe Wang2, Shasha Wang2, Chunchun Zhang3, Chaoran Luan4, Xiaoqin Chen2( ), Kui Yu1,2( )
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
Engineering Research Center in Biomaterials, Sichuan University, Chengdu 610065, China
Analytical & Testing Center, Sichuan University, Chengdu 610065, China
College of Biomedical Engineering, Sichuan University, Chengdu 610065, China
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Graphical Abstract

The approach to the development of aqueous-phase CdSeS magic-size clusters (MSCs) and quantum dots (QDs) is proposed. At 25 ℃, the precursor compound of CdSeS MSC-380 (PC-380) forms via chemical self-assembly in the reaction of CdCl2/3-mercaptopropionic acid (MPA), selenourea (SeU), and thioacetamide (TAA). Primary amine butylamine (BTA) assists the PC to MSC transformation. At 80 ℃, the PC fragments to monomers, followed by the nucleation and growth of CdSeS QDs. Our findings suggest that PC-380 forms prior to the nucleation and growth of CdSeS QDs.

Abstract

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 CdCl2·2.5H2O, 3-mercaptopropionic acid (MPA, HS−(CH2)2−COOH), selenourea (SeU, NH2−C(Se)−NH2), and thioacetamide (TAA, CH3−C(S)−NH2). Prior to the nucleation and growth (N/G) of QDs, there are clusters formed at 25 °C. 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−(CH2)3−NH2), the PC transforms to absorbing CdSeS MSC-380. At 80 °C, 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.

Keywords

aqueous phaseprecursor compound (PC)magic-size cluster (MSC)quantum dot (QD)cadmium selenide sulfide

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Nano Research
Volume 17 Issue 12,
December 2024
Pages 10529-10535
DOI: 10.1007/s12274-024-6884-y
Cite this article:
Jiang Y, Wang Z, Wang S, et al. Development of aqueous-phase CdSeS magic-size clusters at room temperature and quantum dots at elevated temperatures. Nano Research, 2024, 17(12): 10529-10535. https://doi.org/10.1007/s12274-024-6884-y
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Received: 24 May 2024
Revised: 10 July 2024
Accepted: 15 July 2024
Published: 24 August 2024
© Tsinghua University Press 2024
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