Figure 2.

TEM characterization. (A) TEM images of PEG-reduced AgNPs obtained by rapidly adding AgNO₃ to the aqueous PEG solution. (B) Atomic-scale resolution TEM image of one PEG-reduced AgNP exhibiting the 5-nm PEG layer around the silver core. Spherical PEG-coated AgNPs of narrow size distribution are visible.