通过阳离子交换方法和转化机制合成 CdTe 魔尺寸团簇,Nanoscale

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通过阳离子交换方法和转化机制合成 CdTe 魔尺寸团簇
Nanoscale ( IF 5.8 ) Pub Date : 2023-09-05 , DOI: 10.1039/d3nr02938g
Zhuohan Lin ₁ , Xin Zhang ₁ , Xue Zhang ₁ , Qianqian Song ₁ , Yan Li ₁

Affiliation

Te的准金属性质不利于碲化物的形成和结晶，这使得单系综形式的CdTe幻尺寸团簇（MSC）的合成仍然具有挑战性。CdTe MSCs通常通过直接合成法合成，该方法必须通过选择合适的活性前体和精确控制反应温度来避免量子点的形成。此外，所使用的有机镉化合物和超氢化前体对空气敏感。本文首次以ZnTe MSC-389为模板、Cd ²⁺作为交换离子，通过阳离子交换法合成了单系综形式的CdTe MSC-448。原位吸收光谱表征结合Yu课题组提出的双路径模型表明，ZnTe MSC-389向CdTe MSC-448的转化是由其相应的前体化合物（PC）辅助的。将Cd前驱体添加到ZnTe MSC-389溶液中后，ZnTe MSC-389转化为ZnTe PC-389，然后与Cd 2+ 进行快速阳离子交换反应，生成CdTe PC-448，CdTe PC ^- 448最后转换成CdTe MSC-448。室温下在空气中通过阳离子交换获得了单系综形式的CdTe MSC，避免了直接合成方法中高温下量子点（QD）的形成，无需使用有毒且昂贵的活性前体，这提供了一种新的方法。 CdTe MSC 的合成路线。

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CdTe magic-size cluster synthesis via a cation exchange method and conversion mechanism

The quasi-metallic nature of Te is not conducive to telluride formation and crystallization, which makes the synthesis of CdTe magic-size clusters (MSCs) in a single-ensemble form still challenging. CdTe MSCs are usually synthesized by direct synthesis, a method that must avoid the formation of quantum dots by selecting suitable active precursors and precisely controlling the reaction temperature. In addition, the organic Cd compounds and superhydrogenated precursors used are air-sensitive. Herein, CdTe MSC-448 in a single-ensemble form was synthesized for the first time via a cation exchange method using ZnTe MSC-389 as a template and Cd²⁺ as an exchange ion. In situ absorption spectroscopy characterization combined with the two-pathway model proposed by Yu's group reveals that the conversion of ZnTe MSC-389 into CdTe MSC-448 is assisted by their corresponding precursor compounds (PCs). After the addition of Cd precursors to ZnTe MSC-389 solution, ZnTe MSC-389 is transformed into ZnTe PC-389, which then undergoes a rapid cation exchange reaction with Cd²⁺ to yield CdTe PC-448, and CdTe PC-448 is finally converted into CdTe MSC-448. CdTe MSCs in single-ensemble form were obtained by cation exchange in air at room temperature, avoiding the formation of quantum dots (QDs) at high temperatures in the direct synthesis method conducted without the use of toxic and expensive active precursors, which provides a new route to the synthesis of CdTe MSCs.

更新日期：2023-09-05

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