Formation and Transformation of ZnTe and CdTe Magic-Size Clusters Assisted by Their Precursor Compounds,Chemistry of Materials

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Formation and Transformation of ZnTe and CdTe Magic-Size Clusters Assisted by Their Precursor Compounds
Chemistry of Materials ( IF 7.2 ) Pub Date : 2024-03-01 , DOI: 10.1021/acs.chemmater.3c03309
Zhe Wang ₁ , Chunchun Zhang ₂ , Shanling Wang ₂ , Meng Zhang ₃ , Xiaoqin Chen ₁ , Chaoran Luan _{4,

5} , Kui Yu _{1,

3}

Affiliation

Colloidal semiconductor magic-size clusters (MSCs) remain poorly understood with regard to their formation and transformation. We show that ZnTe MSC-324 (with an optical absorption peak at 324 nm) and MSC-398 evolve in reactions of Zn and Te precursors, while CdTe MSC-371 and MSC-481 develop in reactions of Cd and Te precursors. We propose that MSCs evolve from their precursor compounds (PCs). Chemical self-assembly results in the formation of ZnTe PC-324 and CdTe PC-371, which, respectively, transform to ZnTe PC-398 and CdTe PC-481 via monomer addition. When the ZnTe MSCs are mixed with Cd(OAc)₂/OLA (cadmium acetate in oleylamine), the CdTe MSCs also evolve. We further hypothesize that cation exchange occurs on the ZnTe PCs, resulting in CdTe PCs that transform to their counterpart CdTe MSCs. Moreover, ZnTe PC/MSC-324 and CdTe PC/MSC-371 have similar Zn/Cd-to-Te stoichiometries, as do ZnTe PC/MSC-398 and CdTe PC/MSC-481. Accordingly, the Te precursor quantitatively dictates the coassembly of Zn or Cd and Te precursors as well as the monomer addition. The present findings advance the understanding of the initial PC formation, PC-to-PC transformation, PC-to-MSC isomerization, and PC-to-monomer fragmentation.

中文翻译：

前体化合物辅助 ZnTe 和 CdTe 幻尺寸团簇的形成和转化

胶体半导体幻尺寸簇（MSC）的形成和转变仍然知之甚少。我们表明，ZnTe MSC-324（光学吸收峰在 324 nm）和 MSC-398 在 Zn 和 Te 前体的反应中演化，而 CdTe MSC-371 和 MSC-481 在 Cd 和 Te 前体的反应中演化。我们认为 MSC 是从其前体化合物 (PC) 进化而来的。化学自组装导致形成 ZnTe PC-324 和 CdTe PC-371，它们分别通过单体添加转化为 ZnTe PC-398 和 CdTe PC-481。_{当 ZnTe MSC 与 Cd(OAc) 2} /OLA（油胺中的乙酸镉）混合时，CdTe MSC 也会演化。我们进一步假设 ZnTe PC 上发生阳离子交换，导致 CdTe PC 转化为其对应的 CdTe MSC。此外，ZnTe PC/MSC-324 和 CdTe PC/MSC-371 具有相似的 Zn/Cd-Te 化学计量，ZnTe PC/MSC-398 和 CdTe PC/MSC-481 也是如此。因此，Te 前体定量地决定了 Zn 或 Cd 和 Te 前体的共组装以及单体添加。目前的研究结果增进了对 PC 初始形成、PC 到 PC 转化、PC 到 MSC 异构化和 PC 到单体断裂的理解。

更新日期：2024-03-01

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