Thermally‐Induced Isomerization of Prenucleation Clusters During the Prenucleation Stage of CdTe Quantum Dots

Author:

Wang Tinghui1,Wang Zhe1,Wang Shanling2,Chen Xiaoqin1,Luan Chaoran3,Yu Kui14ORCID

Affiliation:

1. Engineering Research Center in Biomaterials Sichuan University 610065 Chengdu Sichuan P. R. China

2. Analytical and Testing Center Sichuan University 610065 Chengdu Sichuan P. R. China

3. Laboratory of Ethnopharmacology Tissue-orientated Property of Chinese Medicine Key Laboratory of Sichuan Province West China School of Medicine West China Hospital Sichuan University 610065 Chengdu Sichuan P. R. China

4. Institute of Atomic and Molecular Physics Sichuan University 610065 Chengdu Sichuan P. R. China

Abstract

AbstractThe evolution of prenucleation clusters in the prenucleation stage of colloidal semiconductor quantum dots (QDs) has remained unexplored. With CdTe as a model system, we show that substances form and isomerize prior to the nucleation and growth of QDs. Called precursor compounds (PCs), the prenucleation clusters are relatively optically transparent and can transform to absorbing magic‐size clusters (MSCs). When a prenucleation‐stage sample at 25, 45, or 80 °C is dispersed in a mixture of cyclohexane (CH) and octylamine (OTA) at room temperature, either MSC‐371, MSC‐417, or MSC‐448 evolves with absorption peaking at 371, 417, or 448 nm, respectively. We propose that PC‐371 forms at 25 °C, and isomerizes to PC‐417 at 45 °C and to PC‐448 at 80 °C. The PCs and MSCs are quasi isomers. Relatively large and small amounts of OTA favor PC‐371 and PC‐448 in dispersion, respectively. The present findings suggest the existence of PC‐to‐PC isomerization in the QD prenucleation stage.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Sichuan Province

State Key Laboratory of Supramolecular Structure and Materials

Publisher

Wiley

Subject

General Chemistry,Catalysis

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Anion Exchange in Semiconductor Magic-Size Clusters;Journal of the American Chemical Society;2024-02-02

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