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O: Oberflächenphysik

O 13: Solid-liquid interfaces

O 13.6: Talk

Monday, March 27, 2006, 16:15–16:30, WIL C207

Potential dependence of the step line tension on vicinal gold surfaces — •Guillermo Beltramo, Margret Giesen, and Harald Ibach — Institut für Schichten und Grenzflächen, ISG4, Forschungszentrum Jülich, Jülich 52425, Germany

The step line tension β per atom plays a crucial role in the electrochemical deposition and dissolution of metals, and in particular, in the creation of nanostructures and their dynamical properties. Recently (1,2) we demonstrated how step energies can be measured in electrolyte by island studies. Now, we introduce a new method to analyze steps energies on metal electrodes.

We present Electrochemical Impedance Spectroscopy studies (EIS) of stepped Au(100) electrodes in electrolyte. Following the model proposed by Schmickler and Ibach (3) one can determine the step line tension, and from the shift of the potential of zero charge (pzc) the dipole moment of the step. Here we will present results obtained in weakly adsorbing electrolytes (sulfuric and perchloric acid). The results will be discussed.

(1) Farad. Disc. 121 (2002) 27.

(2) J. Electroanal. Chem. 524-525 (2002) 194.

(3) Physical Rev. Lett. 91 (2003) 016106.