FOURIER-TRANSFORM SERS STUDIES OF THE CHEMISORPTION OF FERRICYANIDE ON GOLD ELECTRODE SURFACES

Surface enhanced Raman spectroscopy (SERS) studies of ferricyanide and ferrocyanide ions at gold electrodes show that in solutions containin g 0.1 M Cs+, ferricyanide ions are adsorbed, but not ferrocyanide. The strength of the interaction with the surface is such that the electro de can be removed from the solution without loss of the SERS signal. T his chemisorbed layer is also observed from solutions containing Li+ i ons. The implications for the mechanism of the heterogeneous electron transfer reaction are discussed.