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TEM images (A–D) of Ag-SiO2 NPs and (E) Ag colloids NPs. (F–H) Size distribution graphs of (F) SiO2 NPs (mean size = 73.53 nm), (G) Ag NPs linked with SiO2 (mean size = 6.6 nm), and (H) Ag-c NPs (mean size = 3.5 nm).