In many literature, authors have used uM or mM (less than 5 mM) of AgNO3 for the synthesis of AgNPs. I just adjusted and increased concentration of AgNO3, NaBH4, and sodium citrate into 10 fold without adjusting the volume of reaction in order to improve AgNPs concentration, but the reaction was not successful. If anybody have a literatur, kindly provide the link.

Thanks!