Fig. 5. (a) UV-vis absorption of the bare ZnO NPs and ZnO NPs decorated with Ag NPs synthesized with aqueous pepper extract at different concentrations of silver nitrate. (b) SEM image of the ZnO/Ag sample (#4) with the largest concentration of Ag. Ag NPs are seen as small bright spots. A representative area (solid line) is enlarged in the inset (dashed line) for a better view.
