Table 1: Properties of quantum dots after their solubilization with DL-Cys.
Sample* | PL emission peak (nm) | Quantum yield (%) | Diameter(nm)** | Hydrodynamic diameter (nm)*** | ζ-potential (mV) |
---|---|---|---|---|---|
QD570 | 570 | 48 | 3.1 | 6 ± 2 | -33.4 |
CdSe/ZnS-Cys | |||||
QD600 | 599 | 42 | 4.6 | 7 ± 2 | -37.5 |
CdSe/ZnS-Cys |
*For all measurements, QD concentrations of about 0.5-1.5 µM were used. In all cases, the absorbance at the first excitation band was < 0.10; **Diameters of the fluorescing CdSe cores of CdSe/ZnS QDs were calculated as previously described [38], then corrected, where necessary, according to Jasieniak, et al. [40]; ***The hydrodynamic diameters were measured using the Dynamic Light Scattering (DLS) technique as previously described [44]. The mean values and standard deviations for three independent experiments are shown.