Spontaneous oscillations in gold electrodeposition |
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| Institution: | 1. CQE—Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;2. LMGP, Univ. Grenoble Alpes, CNRS, F-38000 Grenoble, France;3. ESTSetúbal, Instituto Politécnico de Setúbal, 1959-007 Setúbal, Portugal;1. University of Castilla-La Mancha, ITQUIMA, Chemical Engineering Department, Avenida Camilo José Cela S/N., 13071 Ciudad Real, Spain;2. University of Vigo, Department of Chemical Engineering, Isaac Newton Building, Campus As Lagoas, Marcosende, 36310 Vigo, Spain;3. Gdansk University of Technology, Faculty of Civil and Environmental Engineering, Gabriela Narutowicza 11/12, 80-233 Gdansk, Poland;1. State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China;2. Analysis and Testing Center, Soochow University, Suzhou 215123, China;3. Global Institute of Software Technology, No. 5. Qingshan Road, Suzhou National Hi-Tech District, Suzhou 215123, China;1. United States Department of Agriculture/Agricultural Research Service, Southern Plains Agricultural Research Center, Food & Feed Safety Research Unit, 2881 F&B Road, College Station, TX 77845, USA;2. Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843, USA;3. Department of Nutrition and Botany, Faculty of Veterinary Medicine, University of Belgrade, Bulevar Oslobodenja 18, Belgrade 11000, Serbia;4. Institute of Food Technology, University of Novi Sad, Bulevar Cara Lazara 1, Novi Sad 21000, Serbia;5. United States Department of Agriculture/Agricultural Research Service, Food Safety and Enteric Pathogens Research Unit, National Animal Disease Center, 1920 Dayton Avenue, KPO Box 70, Ames, IA 50010, USA |
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| Abstract: | 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 J1: one is the current ramp which tends to increase J1 and the other one is the growing of the gold deposit which induces a decrease of J1. |
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