New rule and growth model for the synthesis method of gold nanorods with binary surfactant CTAB and NaOL

The roles of CTAB and Ag + have been discovered given us a deeper understanding the seed-mediated method in gold nanorods synthesis. Former work used binary surfactants NaOL (sodium oleate) to greatly improve dimensional tunability monodispersity nanorods. However, they only few concentration combinations surfactants, influence under this has not systematically studied. In work, we carried out systematic experiments variation transmission electron microscopy UV–vis-near-infrared spectroscopy monitor growth process results showed that contributed symmetry breaking process. We ideal ranges different concentrations (10–40 mM). Lower produced many impurities, such as Au spheres, while higher led decrease obtained A model based on balance diffusion/reduction solution proposed order explain formation