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Effects of reagent addition sequence on the formation of AgNPs: UV–Vis spectrum (λ = 300–600 nm) of silver nanoparticles. Effect of reagent addition order on silver nanoparticles synthesized by silver nitrate (AgNO3), trisodium citrate (SC), and sodium borohydride (NaBH4). I: AgNO3 + SC mix 5 min, add NaBH4 then mix for 2 h. II: AgNO3 + NaBH4 mix 5 min, add SC, then mix for 2 h. III: SC + NaBH4 mix 5 min, add AgNO3, then mix for 2 h.
