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Effects of mixing time and pH on the generation of AgNPs: (A) UV–Vis absorption spectrum (λ = 300–600 nm) of silver nanoparticles synthesized by silver nitrate, trisodium citrate, and sodium borohydride at different synthesizing times; and (B) UV–Vis absorption spectrum (λ = 300–600 nm) of silver nanoparticles synthesized by silver nitrate, trisodium citrate, and sodium borohydride in different pH value solutions (pH 2–12).
