Figure 2

(a) EDS spectroscopy of the silver nanoclusters biosynthesized in situ by HeLa cells after incubation for 24 h or 48 h with [Ag(GSH)]+. (b) X-ray photoelectron spectra (XPS) evidencing the Ag 3d photo-electron emission from silver nanoclusters biosynthesized in situ by HeLa cells after incubation for 24 h or 48 h with [Ag(GSH)]+.