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.
Stiufiuc et al. Nanoscale Research Letters 2013 8:47 doi:10.1186/1556-276X-8-47