Effects of electrolytes used in roughening gold substrates by oxidation–reduction cycles on surface-enhanced Raman scattering

A multi-technique study of gold oxidation and semiconducting properties of the compact α-oxide layer

“…0.8 V was also observed when gold was polarized up to the anodic potential limit of 1.3 V vs. Ag/AgCl in near neutral solutions [34,35]. The XPS analysis showed the presence of both Au + and Au 3+ species in the oxide layer.…”

Optimally electrochemically roughened silver substrates prepared in gold complexes-containing solutions for trace molecules detection

“…In our previous study [15] regarding the effect of electrolytes used for electrochemically roughening gold substrates on SERS, it was found that the SERS effect was increased with an increase of the content of Cl in the total Cl and Au species on the Au substrate after the ORC treatment. Some incorporated and residual Cl species on the roughened Au substrate may be contributive to the increased SERS intensity of the ligand.…”

“…They include plasmon treatment [9,10], sputtering coating [11,12], mechanically polishing by using abrasives [13] vacuum vapor deposition [14], and electrochemical [15] and laser ablation [16]. However, a controllable and reproduced surface roughness can be generated through control of the electrochemical oxidation-reduction cycles (ORC) procedure [17,18].…”

Fabrication of nano-network gold films via anodization of gold electrode and their application in SERS

“…Up to present, a number of electrochemical strategies have been developed for fabricating nanostructured gold electrodes for SERS substrates, including roughening gold electrodes with triangular-wave electrochemical oxidation reduction cycles (ORC) [6,7], anodic potential step [8][9][10] and square-wave potential-pulses [11], and templated electrodeposition [12]. Recently, a nanoporous gold film with thickness of approximately 1 μm was made by anodization of gold electrode in an aqueous solution of carboxylic acid or carboxylate [13,14].…”