Electrodeposition of gold thin films with controlled morphologies and their applications in electrocatalysis and SERS |
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Authors: | Elias Jamil Gizowska Magdalena Brodard Pierre Widmer Roland Dehazan Yoram Graule Thomas Michler Johann Philippe Laetitia |
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Affiliation: | EMPA-Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Swiss Federal Laboratories for Materials Testing and Research, Feuerwerkstrasse 39, Thun, Switzerland. jamil.elias@empa.ch |
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Abstract: | Here, an easy and effective electrochemical route towards the synthesis of gold thin films with well-controlled roughness, morphology and crystallographic orientation is reported. To control these different factors, the applied potential during deposition played a major role. A tentative nucleation and growth mechanism is demonstrated by means of electrochemical characterizations and a formation mechanism is proposed. Interestingly, the differences in geometry and orientation of the different gold deposits have shown a clear correlation with the electrocatalytical activity in the case of oxygen sensing. In addition, not only the electrocatalytical activity but also the surface-enhanced Raman scattering of the gold deposits have been found to depend both on the roughness and on the size of the surface nanostructures, allowing a fine tuning by controlling these two parameters during deposition. |
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