Spontaneous Oscillations During The Electrodeposition of Gold Thin Films

Author:

Ravaine Serge,Saliba Raphaël,Mingotaud Christophe,Argoul Françoise

Abstract

ABSTRACTThe galvanostatic electrodeposition of two-dimensional (2D) gold films along the surface of aqueous hydrogen tetrachloroaurate solutions coated by a positively charged dimethyldioctadecylammonium (DODA) monolayer is reported. When a constant current is applied to the working electrode, a transition between two-dimensional (2D) growth and three-dimensional (3D) thickening of the deposits is observed. This event occurs when the current density is sufficiently small to allow the 3D process to consume all the injected electrical charges. The application of a current ramp with a rate such as the current density remains during the whole growth close to the limiting value separating the two growth regimes induces the appearance of spontaneous oscillations between the regimes of 2D and 3D growth. Deposits with a well-defined terraced structure are then obtained.

Publisher

Springer Science and Business Media LLC

Subject

General Engineering

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