Electrochemical studies for the formation of sodium lauryl sulfate monolayer on an octadecanethiol-coated gold electrode

The formation process of sodium lauryl sulfate monolayers on the surface of octadecanethiol self-assembled monolayers was investigated by the method o f cyclic voltammetry and ac impedance spectroscopy. The pinhole in an octad ecanethiol-coated gold electrode can be patched when adding sodium lauryl s ulfate to solution. The charge transfer resistance increased but the membra ne capacitance decreased with the addition of sodium lauryl sulfate or othe r amphiphilic substance, indicating that the adsorption of sodium lauryl su lfate on the electrode surface from solution. (C) 2000 Elsevier Science B.V . All rights reserved.