High-yield synthesis of monodisperse gold nanorod with tunable plasmon wavelength using 3-aminophenol as the reducing agent
Facile synthesis of high quality gold nanorods (AuNRs) with tunable size is of great value for application of AuNR in various fields as well as study on growth mechanism of such anisotropic nanostructure. However, limitations usually exist in a specific synthesis protocol. In this work, using 3-aminophenol as the reducing agent, we present a AuNR synthesis strategy with an excellent comprehensive performance, which includes an exceptional monodispersity, a AuNR shape purity of around 99%, a conversion ratio of gold precursor of about 91%, and an easily tuned longitudinal surface plasmon resonance wavelength ranging from 580 to 1050 nm. Studies on impacts of the experimental parameters including silver ions, gold seeds, reducing agent, and cetyltrimethylammonium bromide (CTAB) revealed a profound recognition of the significant effect of the reductive atmosphere, in synergy with other parameters, on directing the growth and structural evolution of the gold seeds, thus deeply affecting the size, shape yield, monodispersity, and morphology of the final structure. These results could be immensely useful for the application and the growth mechanism revelation of AuNR.