Effects of Size and Concentration of Gold Nanoparticles on Diffusion Coefficient of Redox Species Fe(CN)_6~(4-)

摘要

The diffusion coefficient (D) of a redox species ferrocyanide in electrolyte solutions containing gold nanoparticles was measured by cyclic voltammetry. It was found that D value depends on the content of gold nanoparticles in the electrolyte solutions. The existence of the gold nanoparticles may have blocked the diffusion of the redox species and hence reduce the apparent diffusion coefficient. At the same total gold concentration (in ppm), smaller gold nanoparticles (5 nm) demonstrate an overall more significant blocking effect compared to larger ones (15 nm) because of the larger total area occupied by all the 5 nm gold nanoparticles.