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The ultraviolet-visible absorption spectrum of silver nanoparticles (AgNPs) was synthesized by reducing silver ions with trisodium citrate (SC) for 0 to 60 min (0, 5, 10, 20, 30, and 60 min). Then sodium borohydride was added to the silver nitrate-trisodium citrate solution and kept stirring for 120 min.
