A variety of sulfide precursors can be used to prepare CdS QDs, including thiourea (A. Aboulaich, D. Billaud, M. Abyan, L. Balan, J.-J. Gaumet, G. Medjadhi, J. Ghanbaja, R. Schneider, ACS Appl. Mater. Interfaces , 2012, 4, 561).
Provide a reaction scheme and describe the reaction conditions employed to prepare 3-mercaptopropionic acid- apped CdS QDs. What reaction time is optimum to achieve the highest energy emission obtained when these QDs are excited with UV radiation? What is the primary influence of the reaction time on the size of these QDs?
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