Preparation of water soluble zinc-blende CdSe/ZnS quantum dots

Zinc-blende CdSe cores were used to produce CdSe/ZnS core-shell quantum dots with green emission (λ em = 520 nm). The shell growth was realized at low temperature using stable reagents as ZnS precursors. The optimal conditions for shell growth were determined. It was shown that the reaction time and concentration of ZnS precursors in initial solution strongly affects the optical properties of the resulted coreshell quantum dots. The CdSe/ZnS quantum dots were transferred to aqueous solution by ligand exchange with mercaptopropionic acid, and denaturated bovine serum albumin was added to improve chemical stability of CdSe/ZnS solution. As a result, highly luminescent water-soluble CdSe/ZnS quantum dots (quantum yield 36%) which can be used as biolabels in immunoassay were obtained.

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