Room‐Temperature Formation Pathway for CdTeSe Alloy Magic‐Size Clusters

Zhang, Hai; Luan, Chaoran; Gao, Dongwen; Zhang, Meng; Rowell, N. L.; Willis, Maureen; Chen, Meng; Zeng, Jianrong; Fan, Hongsong; Huang, Wen; Chen, Xiaoqin; Yu, Kui

doi:10.1002/ange.202005643

Cited by 6 publications

(2 citation statements)

References 64 publications

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“…An in situ examination by optical absorption spectroscopy becomes more practical when a reaction proceeds at low temperatures (such as 80 °C or lower) [4, 16, 28–34] . Such a real‐time observation can be essentially continuous, providing a significantly more complete picture of the MSC evolution and transformation.…”

Section: Introductionmentioning

confidence: 99%

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A Real‐Time In Situ Demonstration of Direct and Indirect Transformation Pathways in CdTe Magic‐Size Clusters at Room Temperature

et al. 2022

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The transformations of colloidal semiconductor magic‐size clusters (MSCs) are expected to occur with only discrete, step‐wise redshifts in optical absorption. Here, we challenge this assumption presenting a novel, conceptually different transformation, for which the redshift is continuous. In the room‐temperature transformation from CdTe MSC‐448 to MSC‐488 (designated by the peak wavelengths in nanometer), the redshift of absorption monitored in situ displays distinctly continuous and/or step‐wise behavior. Based on conclusive evidence provided by real‐time experiments, the former transformation is apparently direct and intra‐cluster with a relatively large energy barrier. The latter transformation is indirect and assisted by MSC precursor compounds (PCs). The former transformation follows the latter often, being predominant at a relatively high temperature. The present findings encourage a reconsideration of the absorption redshift reported previously for transformations of binary II–VI MSCs, together with the pathway associated without the increase of cluster mass.

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Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the MSCs can evolve from unique precursor compounds (PCs) via a quasi‐isomerization [1, 4, 24–35] . The PCs are relatively optically transparent at the peak positions of their counterpart MSCs and to longer wavelengths.…”

Section: Introductionmentioning

confidence: 99%

A Real‐Time In Situ Demonstration of Direct and Indirect Transformation Pathways in CdTe Magic‐Size Clusters at Room Temperature

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Transformation Pathway from CdSe Magic‐Size Clusters with Absorption Doublets at 373/393 nm to Clusters at 434/460 nm

et al. 2021

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Divergent interpretations have appeared in the literature regarding the structural nature and evolutionary behavior for photoluminescent CdSe nanospecies with sharp doublets in optical absorption. We report ac omprehensive description of the transformation pathway from one CdSe nanospecies displaying an absorption doublet at 373/393 nm to another species with ad oublet at 433/460 nm. These two nanospecies are zero-dimensional (0D) magic-sizec lusters (MSCs) with 3D quantum confinement, and are labeled dMSC-393 and dMSC-460, respectively.S ynchrotron-based small-angle X-rays cattering (SAXS) returns ar adius of gyration of 0.92 nm for dMSC-393 and 1.14 nm for dMSC-460, and indicates that both types are disc shaped with the exponent of the SAXS form factor equal to 2.1. The MSCs develop from their unique counterpart precursor compounds (PCs), whichare labeled PC-393 and PC-460, respectively.For the dMSC-393 to dMSC-460 transformation, the proposed PCenabled pathwayiscomprised of three key steps,dMSC-393 to PC-393 (Step 1), PC-393 to PC-460 (Step 2i nvolving monomer addition), and PC-460 to dMSC-460 (Step 3). The present study provides af ramework for understanding the PC-based evolution of MSCs and howP Cs enable transformations between MSCs.

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Transformation Pathways in Colloidal CdTeSe Magic‐Size Clusters

Yang

Luan

et al. 2021

Angewandte Chemie

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Ararely studied transformation in colloidal ternary magic-size clusters (MSCs) is addressed. We report the first observation of the transformation from ternary CdTeSe MSC-399 to MSC-422, whichoccurs at room temperature.These two MSC types displaysharp optical absorption resonances at 399 and 422 nm, respectively,and are related in that they are quasi isomers,together with their counterpart precursor compounds (PCs). Binary CdTea nd CdSe samples were prepared in the prenucleation stage also called the induction period (IP). After they were mixed and placed in am ixture of toluene and octylamine,the transformation was found to take place and to be assisted by the addition of the CdSe IP sample.Abinary IP sample contains corresponding binary PCs and monomers (Mo) and fragments (Fr). We argue that the transformation pathway is enabled by the corresponding ternary PCs,involving the substitution reaction, namely CdTeSe PC-399 + CdSe (Mo/Fr)-1 ) CdTeSe PC-422 + CdSe (Mo/Fr)-2. The present study provides an in-depth understanding of the formation characteristics of the MSCs.

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Room‐Temperature Formation Pathway for CdTeSe Alloy Magic‐Size Clusters

Cited by 6 publications

References 64 publications

A Real‐Time In Situ Demonstration of Direct and Indirect Transformation Pathways in CdTe Magic‐Size Clusters at Room Temperature

A Real‐Time In Situ Demonstration of Direct and Indirect Transformation Pathways in CdTe Magic‐Size Clusters at Room Temperature

Transformation Pathway from CdSe Magic‐Size Clusters with Absorption Doublets at 373/393 nm to Clusters at 434/460 nm

Transformation Pathways in Colloidal CdTeSe Magic‐Size Clusters

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