Imaging Concentration Profiles of Redox‐Active Species with Nanometric Amperometric Probes: Effect of Natural Convection on Transport at Microdisk Electrodes

Abstract

Nanoprobes for diffusion measurements: Nanometric-sized electrodes (r=80 nm) have been constructed to map concentration profiles within the diffusion layer of a larger microelectrode (r=40 μm) at high resolution (see picture). Comparisons with theoretical predictions demonstrate that, contrary to common wisdom, natural convection in the solution does, to some extent, affect diffusion at microelectrodes.