In this recent paper, we set out to explore the mechanism of gold nano rod growth. The nano rods grow from isotropic seed particles into anisotropic rods. Why and how this is happening has always fascinated me. One of the leading hypothesis for the growth mechanism is that elongated micelles direct the anisotropic growth via a template effect.
To explore if this is true, we have employed gemini surfactants to the growth process. The gemini surfactants are known to form very elongated micelles. Based on our observations, we conclude that surface binding effects are more important for the anisotropic growth than the elongated micelle/template effect.
The paper can be found here:
Titoo Jain, Ali R. Tehrani-Bagha, Himanshu Shekhar, Ross Crawford, Erik Johnson, Kasper Nørgaard, Krister Holmberg, Paul Erhart, Kasper Moth-Poulsen"Anisotropic Growth of Gold Nanoparticles using Cationic Gemini Surfactants: Effects of Structure Variations in Head and Tail Groups" J. Mater. Chem C. 2014 (emerging investigator issue) DOI:10.1039/C3TC32057J