Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 4, Issue 8, Pages 629-632Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S1388-2481(02)00391-0
Keywords
electrodeposition; gold; oscillations; interface; surfactant monolayer
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We report the appearance of spontaneous oscillations during the electrodeposition of gold along the surface of aqueous hydrogen tetrachloroaurate solutions coated by a positively charged dimethyldioctadecylammonium monolayer, when a current ramp with a rate comprised between 1 and 1.5 nA s(-1) is applied to the working electrode. Alternating sequences of two-dimensional (2D) growth and three-dimensional (3D) thickening of the deposits leading to gold films with a well-defined terraced structure are observed. Such a phenomenon appears to be produced by the competition between two mechanisms controlling the current density J(1) : one is the current ramp which tends to increase J(1) and the other one is the growing of the gold deposit which induces a decrease of J(1). (C) 2002 Elsevier Science B.V. All rights reserved.
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