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(A) UV–Vis spectra of colloidal AgNPs indicating increase in the peak intensity with time, along with a redshift. (B) pH value of the mixture gradually decreased during the reaction time. (C) Color change of the mixture from light yellow to dark brown during the reaction, which indicates synthesis of silver nanoparticles.
Abbreviations: AgNPs, silver nanoparticles; UV-Vis, ultraviolet-visible.
