PNNL

Abstract

Controlled synthesis of nanostructures is essential for many applications, from energy storage/generation and catalysis to semiconductor and biomedical devices. Normally, nanostructures are characterized after synthesis and growth mechanisms are assumed. Here we show the first direct observation of nanoparticle synthesis in a liquid crystal surfactant template using an electron microscope fluid stage. The nanoparticles first sinter (to ~5nm), then grow connections to each other around the micelles to form clusters. Upon reaching a critical size (>10-15nm), the clusters become highly mobile in the template, displacing micelles to form spherical nanoparticles. This ability to observe and understand fundamental growth mechanisms on the nanoscale in real time and in aqueous environments will impact every branch of nanoscience where precise control over nanostructure is essential. Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.