UNDERPOTENTIAL DEPOSITION AND ELECTROCRYS TALLIZATION OF SILVER ON AU(100)

The underpotential deposition (UPD) and overpotential deposition (OPD) process of silver on Au(100) single crystal surface was studied using conventional electrochemical techniques and in-situ scanning tunnelin g ; microscopy (STM) with lateral atomic resolution. The substrate sur face was characterized at relatively positive potentials, as well as t he structures formed by silver atoms during the different adsorption s teps. Al relatively low overpotentials a ''monolayer by monolayer'' or ''Frank-van der Merwe'' growth mode was observed, owing to a negligib le metal-substrate misfit.