Cu-Based quantum dots (QDs) are of great interest due to their unique properties enabling the replacement of traditional toxic Cd- or Pb-based QDs, for use in bioimaging and biomedical applications. Different reaction conditions have profound effects upon the morphologies and photophysical properties of the obtained QDs, the investigation of which is crucial in order to prepare the highest quality Cu-based QDs. Here, we have carried out a series of studies, optimizing the synthesis of CIZS/ZnS/ZnS QDs via careful control of the ZnS shell deposition. The effects of different reaction temperatures and growth times on the resulting morphologies and optical properties of the QDs have been systematically examined. It has been found that reaction temperature plays a significant role in the resulting optical properties and morphologies, affecting the deposition dynamics of the shell materials and the onset of severe surface ligand degradation. Based on the detailed studies, optimal reaction conditions have been chosen and highly fluorescent CIZS/ZnS/ZnS core/shell/shell heterostructured QDs, with PLQYs as high as 41.6 ± 4.2%, have been produced. In addition, we have achieved for the first time a “giant” ZnS shell (QDs of 13.02 nm in diameter). These results are important for the further development of CIZS/ZnS/ZnS core/shell/shell nanoheterostructures with optimal optical properties and morphology.

中文翻译：

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发光 CIZS/ZnS/ZnS 核/壳/壳纳米异质结构的可控合成

Cu 基量子点 (QD) 因其独特的特性而备受关注，因为它们能够替代传统的有毒 Cd 或 Pb 基 QD，用于生物成像和生物医学应用。不同的反应条件对获得的 QDs 的形态和光物理性质有深远的影响，其研究对于制备最高质量的 Cu 基 QDs 至关重要。在这里，我们已经进行了一系列的研究，优化CIZS /硫化锌/ ZnS量子点的合成通过仔细控制 ZnS 壳沉积。已经系统地研究了不同反应温度和生长时间对所得到的量子点形态和光学性质的影响。已经发现，反应温度在产生的光学性质和形态中起着重要作用，影响壳材料的沉积动力学和严重的表面配体降解的开始。基于详细研究，选择了最佳反应条件，并产生了高荧光 CIZS/ZnS/ZnS 核/壳/壳异质结构 QD，PLQY 高达 41.6 ± 4.2%。此外，我们首次实现了“巨型”ZnS 壳（QD 直径为 13.02 nm）。