Structural and Electrochemical Characterization of Ag Cubic-particles on HOPG

The structural and electrochemical properties of Ag cubic-particles supported on highly oriented pyrolytic graphite (HOPG) have been studied using atomic force microscopy (AFM)) and voltammetry. Ag cubic-particles aggregate in an array on HOPG in solution. The AFM image of the Ag particles is similar to that obtained using transmission electron microscopy. Voltammogram of the Ag particles on HOPG electrode gives a pair of peaks at around -0.7 V (Ag/AgCl) in NaBr solution, which corresponds to the order-disorder structural transition of Br layer adsorbed on Ag(100) electrode. The surface structure and electrochemical properties of Ag cubic-particles are similar to those of Ag(100).