Synthesis of SnAgCu nanoparticles with low melting point by the chemical reduction method.

SnAgCu alloy with low melting point and good soldering property is a good candidate for the Sn/Pb eutectic. In this paper, SnAgCu nanoparticles were synthesized by a chemical reduction method. The particle size and the melting point are controlled by modifying the process parameters, including reaction temperature, surfactant concentration and dropping speed of precursor. The lowest melting onset temperature is observed at 199.1°C, which is 18°C lower than that of commercially available SnAgCu solder alloy. The tensile strength of the as-synthesized reaches 34.3MPa, which reveals a good solderability property.