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The precursor compound of two types of ZnSe magic-sized clusters

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Abstract

Precursor compounds (PCs) link quantum dots (QDs) and magic-sized clusters (MSCs), which is pivotal in the conversion between QDs and MSCs. Here, for the first time, we report the transformation, synthesis, and composition of a type of ZnSe PCs. ZnSe PCs can be directly transformed to two different MSCs with the assistance of octylamine and acetic acid at room temperature. The two types of MSCs exhibit sharp absorption peaks at 299 and 328 nm which are denoted as MSC-299 and MSC-328. In the preparation of ZnSe PCs, diphenylphosphine (DPP) as an additive plays a key role which not only inhibits the thermal decomposition of Zn precursor, but also acts as a reducing agent to reduce the by-products produced in the reaction. The composition was explored by X-ray photoelectron spectroscopy, energy dispersive spectrometer, matrix-assisted laser desorption/ionization time-of-flight mass spectra with ZnSe PC powder appeared as white powder after purifying by toluene (Tol) and methanol (MeOH). The results indicate that the molar ratio of Zn/Se is 2:1 with a molecular of ∼ 3,350 Da. Therefore, we propose that the molecular formula of ZnSe PCs is Zn32Se16. In addition, at the molecular level, the covalent bond of Zn-Se is formed in ZnSe PCs. This study offers a deeper understanding of the transformation from PCs to MSCs and for the first time proposes the composition of PCs. Meanwhile, this research provides us with a new understanding of the role of DPP in the synthesis of colloidal semiconductor nanoparticles.

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Acknowledgements

K. Y. gives her thanks to the National Natural Science Foundation of China (NSFC) (No. 21773162), the Applied Basic Research Programs of Science and Technology Department of Sichuan Province (No. 2020YJ0326) and the State Key Laboratory of Supramolecular Structures and Materials of Jilin University (SKLSSM 202035). M. Z. is grateful to Sichuan University Postdoctoral Research Fund (No. 2019SCU12073) and the Fundamental Research Funds for the Central Universities. We are grateful to Dr. Shaolan Wang and Dr. Shuguang Yan in the Analytical & Testing Center of Sichuan University for the respective TGA and XPS measurements, and Dr. Shuguang Yan for his help for the analysis of XPS results. Also, we thank Ms. Jiao Lu in the Engineering Research Center in Biomaterials of Sichuan University for her help in MALDI-TOF MS measurements.

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Authors and Affiliations

  1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, China

    Xingxia Yang, Meng Zhang & Kui Yu

  2. Engineering Research Center in Biomaterials, Sichuan University, Chengdu, 610065, China

    Qiu Shen, Yang Li & Kui Yu

  3. Department of Ophthalmology, West China School of Medicine, West China Hospital, Sichuan University, Chengdu, 610065, China

    Chaoran Luan

  4. State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China

    Kui Yu

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  1. Xingxia Yang
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Yang, X., Zhang, M., Shen, Q. et al. The precursor compound of two types of ZnSe magic-sized clusters. Nano Res. 15, 465–474 (2022). https://doi.org/10.1007/s12274-021-3503-z

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