Authors: M.L. Lin, F. Yang, J.S. Peng, C.M. Hsu, S. Lee
Affilation: National United University, Taiwan
Pages: 320 - 323
Keywords: digestive ripening, gold nanoparticles
It is known that the nearly monodisperse gold particles of nanosizes could be prepared by using digestive ripening. Based on the assumption of charged particles, the model for expressing the digestive ripening has been proposed. However, there is no experimental evidence to support the assumption of charged particles. Charged particles in a solution move under the action of an electric field, which can cause accumulation of the charged particles. This work investigated the effect of electric field on digestive ripening of gold particles of nanosizes during reflux heating at 130C. The effect of electric field on the evolution of the particle size and the self-assembly of the formed gold nanoparticles is also examined. Under the action of an electric field, the polydispersed gold nanoparticle with the negative charge reached the state of nearly monodispersity. The electric field caused the increase of the particle size and induced the self-assembly of the nearly monodisperse gold nanoparticles, which is observed under high electric field intensity. The nanostructure of self-assembled gold particle nanostructures is six-fold symmetry. These experimental observations reveal that digestive ripening with the current is a new way for engineering application to control the particle size of metallic nanoparticles.