Formation of colloidal alloy semiconductor CdTeSe magic-size clusters at room temperature

Dong Gao, Xiaoyu Hao, Nelson Rowell, Theo Kreouzis, David J. Lockwood, Shuo Han, Hongsong Fan, Hai Zhang, Chunchun Zhang, Yingnan Jiang, Jianrong Zeng (), Meng Zhang () and Kui Yu ()
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Dong Gao: Sichuan University
Xiaoyu Hao: Sichuan University
Nelson Rowell: National Research Council of Canada
Theo Kreouzis: Queen Mary University of London
David J. Lockwood: National Research Council of Canada
Shuo Han: Sichuan University
Hongsong Fan: Sichuan University
Hai Zhang: Sichuan University
Chunchun Zhang: Sichuan University
Yingnan Jiang: Changchun University of Chinese Medicine
Jianrong Zeng: Chinese Academy of Sciences
Meng Zhang: Sichuan University
Kui Yu: Sichuan University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Alloy semiconductor magic-size clusters (MSCs) have received scant attention and little is known about their formation pathway. Here, we report the synthesis of alloy CdTeSe MSC-399 (exhibiting sharp absorption peaking at 399 nm) at room temperature, together with an explanation of its formation pathway. The evolution of MSC-399 at room temperature is detected when two prenucleation-stage samples of binary CdTe and CdSe are mixed, which are transparent in optical absorption. For a reaction consisting of Cd, Te, and Se precursors, no MSC-399 is observed. Synchrotron-based in-situ small angle X-ray scattering (SAXS) suggests that the sizes of the two samples and their mixture are similar. We argue that substitution reactions take place after the two binary samples are mixed, which result in the formation of MSC-399 from its precursor compound (PC-399). The present study provides a room-temperature avenue to engineering alloy MSCs and an in-depth understanding of their probable formation pathway.

Date: 2019
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DOI: 10.1038/s41467-019-09705-w

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