Effects of Additives on the Preparation of Ag Nanoparticles Using the Microwave‐Induced Plasma in Liquid Process

The effect of additives, i. e., H 2 O 2 and pH adjustors, on the preparation of Ag nanoparticles (NPs) fabricated using the microwave‐induced plasma in liquid process (MWPLP) has been investigated. When both aqueous ammonia and NaOH were used as pH adjustors, the rate of the reduction of silver ions decreased with lower concentrations of H 2 O 2 or at higher pH values. Under these conditions, the aggregation of generated nuclei during the early stages of the reduction was suppressed, and the sizes of the obtained Ag NPs decreased. The amount of H 2 O 2 and the pH of the reduction solutions are therefore highly important parameters for the preparation of well‐dispersed Ag NPs using the MWPLP.