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O: Fachverband Oberflächenphysik
O 18: Solid-liquid Interfaces II
O 18.2: Vortrag
Montag, 31. März 2014, 16:15–16:30, WIL A317
Current-time characteristics of the electrochemical deposition of zinc-oxide on microelectrodes and a finite element simulation of the diffusion control — •Christian Lupo and Derck Schlettwein — Institute of Applied Physics, Justus-Liebig-University Giessen, Germany
Zinc oxide (ZnO) films were prepared by electrochemical deposition on interdigitated microstructures of gold band electrodes. Electrodeposition was realized at constant electrode potential from an oxygen-saturated aqueous zinc chloride solution in the presence of the xanthene dye EosinY. The composition of the solution, the deposition time, the interdigital electrode size, gap width and the number of electrode bands were varied. The current during reduction of O2 and the subsequent growth of ZnO was measured and correlated with results of scanning electron microscopy and of simulations by the finite element method (FEM). The close match of the observed chronoamperometric curves confirms the diffusion-controlled behavior of the oxygen reduction and of the subsequent deposition of ZnO. Furthermore the FEM simulation can be used to discuss an influence of an increasing surface area during film growth on the diffusion-limited precipitation reaction. Such application of the FEM to electrochemical deposition reactions can provide useful contributions to the further development towards a controlled electrochemical growth on electrodes with different geometric features on the microscale.