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Characterization of silver nanoparticles (AgNPs). (a–d) Physicochemical properties of Citrate AgNPs, polyethylene glycol (PEG) AgNPs, polyvinylpyrrolidone (PVP) AgNPs, and branched polyethyleneimine (BPEI) AgNPs in stock suspensions. (A–D) TEM images of surface-modified AgNPs at 0 time. (A) Citrate AgNPs, (B) PEG AgNPs, (C) PVP AgNPs, and (D) BPEI AgNPs. The polydispersity index (PI) of DLS in each medium was less than 0.05.
