Synthesis technics of Au nanoparticles in aqueous phase influence

Respectively using citric acid three sodium and sodium borohydride as the reducing agent, we prepared stable gold colloid by reducing chloroauric acid in aqueous phase. Transmission electron microscope, dynamic light scattering, UV-Vis spectrophotometer were used to characterize the size, shape, structure, size distribution and optical properties of the prepared Au nanoparticles. The influence of reductant amounts, reacting time, reaction temperature, pH value of the precursor on the concentration, size, shape and monodispersity of Au colloid were investigated. It's found that we can control the synthesis of Au nanoparticles by adjusting the synthesis technics. Spherical Au nanoparticles with the average size of 5-70nm can be prepared in this method.