Exploiting the facile oxidation of evaporated gold films to drive electroless silver deposition for the creation of bimetallic Au/Ag surfaces

Plowman, Blake J., Field, Matthew R., Bhargava, Suresh K., & O'Mullane, Anthony P. (2014) Exploiting the facile oxidation of evaporated gold films to drive electroless silver deposition for the creation of bimetallic Au/Ag surfaces. ChemElectroChem, 1(1), pp. 76-82.

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Gold is often considered as an inert material but it has been unequivocally demonstrated that it possesses unique electronic, optical, catalytic and electrocatalytic properties when in a nanostructured form.[1] For the latter the electrochemical behaviour of gold in aqueous media has been widely studied on a plethora of gold samples, including bulk polycrystalline and single-crystal electrodes, nanoparticles, evaporated films as well as electrodeposited nanostructures, particles and thin films.[1b, 2] It is now well-established that the electrochemical behaviour of gold is not as simple as an extended double-layer charging region followed by a monolayer oxide-formation/-removal process. In fact the so-called double-layer region of gold is significantly more complicated and has been investigated with a variety of electrochemical and surface science techniques. Burke and others[3] have demonstrated that significant processes due to the oxidation of low lattice stabilised atoms or clusters of atoms occur in this region at thermally and electrochemically treated electrodes which were confirmed later by Bond[4] to be Faradaic in nature via large-amplitude Fourier transformed ac voltammetric experiments. Supporting evidence for the oxidation of gold in the double-layer region was provided by Bard,[5] who used a surface interrogation mode of scanning electrochemical microscopy to quantify the extent of this process that forms incipient oxides on the surface. These were estimated to be as high as 20% of a monolayer. This correlated with contact electrode resistance measurements,[6] capacitance measurements[7] and also electroreflection techniques...

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ID Code: 64348
Item Type: Journal Article
Refereed: Yes
DOI: 10.1002/celc.201300079
ISSN: 2196-0216
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Copyright Statement: This is the accepted version of the following article: Plowman, B. J., Field, M. R., Bhargava, S. K. and O'Mullane, A. P. (2014), Exploiting the Facile Oxidation of Evaporated Gold Films to Drive Electroless Silver Deposition for the Creation of Bimetallic Au/Ag Surfaces. CHEMELECTROCHEM, 1: 76–82. doi: 10.1002/celc.201300079, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/celc.201300079/abstract
Deposited On: 13 Nov 2013 00:12
Last Modified: 05 Jan 2015 10:16

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