Engineering Quantum Dot (Cadmium Sulfide) on Antibodies for Fluoroimmunoassays

Figure 7

DLS and TEM analysis. (a) The DLS analysis of cysteine-capped CdS QD shows particles in a size range of 0.4 to 3 nm and fewer in 10 to 60 nm with a mean size of 6 nm. (b) The DLS analysis of IgG-conjugated cysteine-capped CdS QD shows particles in a size range of 10 to 100 nm with an increase of 30 nm in size with a mean size of approximately 30 nm. (c) TEM image of cysteine-capped CdS QD synthesized in taurine presence (25 nm scale) shows the monodisperse spherical particles in a size below 7 nm. (d) TEM image (50 nm) shows the uniform distribution of IgG-conjugated cysteine-capped CdS QD with a spherical shape and mean size of 30 nm.

(a)

(b)

(c)

(d)