Table 1.

Characterization of the CdSe/ZnS QDs, suspended in PBS, pH 7.4.

ligand	RH–FCS (nm)	RH–DLS (nm)	ζ-potential (mV)	abs./em. (nm)	QY %
cysteaminea	6.3 ± 0.4	5.0 ± 0.5	+29 ± 4b	592/604	55 ± 2
DPAa	6.1 ± 0.1	4.5 ± 0.5	−27 ± 2	592/604	52 ± 2
DHLA	4.8 ± 0.2	4.1 ± 0.7	−31 ± 4	584/604	8 ± 2
polymerc	9.3 ± 0.2	8.8 ± 1.7	−27 ± 2	570/586	69 ± 3

^aPrepared from commercial core/shell QDs (QD ITK 605, Invitrogen); ^bin milliQ water; ^ccommercial QDs (QD ITK 585, Invitrogen) with carboxyl surface functionalization.