Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 11, Pages 2725-2732Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b01005
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Funding
- National Natural Science Foundation of China (NSFC) [21773162, 21573155]
- State Key Laboratory of Polymer Materials Engineering of Sichuan University [skIpme2018-2-08]
- Fundamental Research Funds for the Central Universities
- Sichuan University Postdoctoral Fellowship [2019SCU12073]
- National Major Scientific and Technological Special Project for Significant New Drugs Development [2018ZX09201009-005-004, 2018ZX09201009-00S-001]
- Open Project of Key State Laboratory for Supramolecular Structures and Materials of Jilin University [SKLSSM 201935]
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We report on the development of a single-step method for synthesizing colloidal semiconductor magic-size clusters (MSCs) with an enhanced production yield in a single-ensemble form and free of the coproduction of conventional quantum dots (QDs). This process eliminates the need for the second step of a lower-temperature incubation used in a two-step approach reported recently for the fabrication of single-ensemble MSCs without QD contamination. We demonstrate that the combined use of a secondary phosphine (HPR2) and an a-methyl carboxylic acid [RCH(CH3)-COOH, MA] promotes the yield of MSCs and suppresses the nucleation and growth of QDs. With CdO and elemental S powder as Cd and S sources, respectively, a single ensemble of CdS MSC-311 (displaying a sharp absorption peak at 311 nm) evolves directly in a reaction in 1-octadecene with an enhanced production yield. This study introduces a one-step avenue for synthesizing effectively and selectively single-ensemble MSCs and improves our understanding of the two-pathway model proposed for the prenucleation stage of QDs.
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