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Here, we report our synthesis of small\u2010size CdS QDs without the coexistence of the PC and thus with enhanced particle yield. For a conventional reaction of cadmium oleate (Cd(OA)<jats:sub>2<\/jats:sub>) and sulfur (S) in 1\u2010octadecene (ODE), we show that after the formation of the PC in the pre\u2010nucleation stage, the addition of tri\u2010n\u2010octylphosphine oxide (TOPO) facilitates the production of small\u2010size QDs. We demonstrate that TOPO fragmentizes the PC that have formed, which enables the nucleation and growth of small\u2010size QDs even at room temperature. Our findings introduce a new approach to making small\u2010size QDs without the coexistence of the PC and with improved particle yield. Providing experimental evidence for the two\u2010pathway model proposed for the pre\u2010nucleation stage of colloidal binary QDs, the present study aids in the advance of non\u2010classical nucleation theory.<\/jats:p>","DOI":"10.1002\/anie.202001608","type":"journal-article","created":{"date-parts":[[2020,5,11]],"date-time":"2020-05-11T08:30:47Z","timestamp":1589185847000},"page":"12013-12021","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":45,"title":["Fragmentation of Magic\u2010Size Cluster Precursor Compounds into Ultrasmall CdS Quantum Dots with Enhanced Particle Yield at Low Temperatures"],"prefix":"10.1002","volume":"59","author":[{"given":"Lijia","family":"Li","sequence":"first","affiliation":[{"name":"Engineering Research Center in Biomaterials Sichuan University  Chengdu Sichuan 610065 P. R. 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