Characterization of nanoparticles
The dimensions of the nanoparticles were characterized by
using a TEM. Our previous result (Zhang et al., 2009) showed that
the synthesized AuNPs had an average diameter of 15 nm. The
absorption peak of the AuNPs was at 519 nm. Fig. 1 shows a TEM
image of our synthesized CdS nanoparticles with an average diameter
of 7 nm, and PbS nanoparticles with an average diameter of
3 nm. After 1 month of storage at 4 ◦C, the CdS and PbS NTs were
stable and did not aggregate.
3.2. Functionalization of nanoparticles