Synthesis and characterization of gold – silver alloy nanoparticles

Gold–Silver alloy nanoparticles were synthesized by microwave assisted redution and polyol reactions, where trisodium citrate (TSC) and poly vinyl pyrollidone (PVP, Mn=1,000,000) played as protective agents, process includes two steps: (i) first, gold nanoparticles were synthesized, (ii) then silver nanoparticles were developed on gold nanoparticles surfaces to form alloy nanoscale. The results of the analysis from UV-Vis, XRD, TEM spectrums showed that gold – silver alloy nanoparticles mostly had core–shell structure and gold was proposed as the core. The particle size of alloy nanoparticles was 30–35 nm, and developed if the amount of silver has increased. UV-Vis spectrum showed this solution has a shoulder peak beside maximum absorbent peak. Trisodium citrate kept an important role to form gold–silver alloy nanoparticles in ethylene glycol.