抄録
Application of Au nanoparticles to various fields has been studied actively because of its unique characteristics different from those of bulk. However, the formation mechanism of Au nanoparticles is still unclear. If the formation mechanism of Au nanoparticles was clarified in more details and the size of Au nanoparticles was controlled more precisely, the application range of Au nanoparticles should be expanded dramatically. The reducing radicals formed in the sonolysis of solution containing Au(III) and colloidal stabilizers, etc., result in the formation of Au seed particles via reduction of Au(III). In this study, seed-mediated growth was carried out using catalysis of Au seed particles formed by the sonochemical reduction of some of Au (III) in the presence of citrate under argon atmosphere. By analyzing the number and average diameter of resulting Au nanoparticles, we discussed the mechanism of seed-mediated growth of Au seed particles. Furthermore, effects of irradiation time and pH on the Au seed growth were investigated.
