Engineering Research Center in Biomaterials, Sichuan University, Chengdu 610065, Sichuan, P. R. China.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, P. R. China.
J Phys Chem Lett. 2022 Jun 9;13(22):4941-4948. doi: 10.1021/acs.jpclett.2c00884. Epub 2022 May 30.
Colloidal semiconductor ternary CdTeS magic-size clusters (MSCs) have not been reported. Here, we present the first synthesis of CdTeS MSCs at room temperature and our understanding of the evolution pathway. The MSCs exhibit sharp optical absorption peaking at 381 nm and are labeled MSC-381. CdTeS MSC-381 evolves when pre-nucleation-stage samples of binary CdTe and CdS that do not contain quantum dots (QDs) are separately prepared and then mixed and incubated at room temperature. We propose that CdTeS MSC-381 evolves from its precursor compound (PC) via quasi-isomerization. Synchrotron-based small-angle X-ray scattering suggests that PCs/MSCs of CdTe and CdTeS are similar in sizes. We propose further that the CdTeS PC forms from the substitution reaction between the CdTe PC and the CdS monomer/fragment (Mo/Fr). The present study paves the way to the room-temperature evolution of ternary MSCs and provides an in-depth understanding of the PC to MSC transformation.
胶体半导体三元 CdTeS 幻数团簇（MSCs）尚未见报道。在此，我们首次在室温下合成了 CdTeS MSCs，并对其演化途径进行了研究。MSCs 表现出在 381nm 处的尖锐光吸收峰，被标记为 MSC-381。当分别制备不含量子点（QDs）的二元 CdTe 和 CdS 的成核前体样品，然后在室温下混合并孵育时，CdTeS MSC-381 会发生演变。我们提出，CdTeS MSC-381 是通过准异构化从其前体化合物（PC）演变而来。基于同步加速器的小角 X 射线散射表明，CdTe 和 CdTeS 的 PC/MSCs 大小相似。我们进一步提出，CdTeS PC 是由 CdTe PC 和 CdS 单体/碎片（Mo/Fr）之间的取代反应形成的。本研究为三元 MSCs 的室温演化铺平了道路，并深入了解了 PC 到 MSC 的转变。
