Using the technique of speckle interferometry, we have studied the statistical characteristics of the roughness produced at the silver surfaces in the electrochemical cell under the conditions of surface enhanced Raman Spectroscopy(SERS).
At the conditions for the maximum SERS intensity, the silver electrode is found to have the averaged roughness amplitudes in the range between 500Å and 800Å with correlation length as long as 8μm.
We also found that the roughness behaviours were dependent very much on the duration as well as voltage height of the Oxidation and Reduction Cycles.