Cyanide adsorption on gold electrodes: a combined surface enhanced Raman spectroscopy and density functional theory study

A SERS investigation of the electrodeposition of Ag–Au alloys from free-cyanide solutions – part II

“…In analogy to similar work on CN À [22], the bands found to peak in the range 430-463 cm À1 might be assigned to bending and stretching modes of such reaction products.…”

An in situ SFG and SERS investigation into the electrodeposition of Au from and solutions

“…A general physical interpretation of the Stark tuning is not yet available, an overview of the state of the art can be found in [21]. Within the framework of DFT modelling [11,26], lower values are believed to denote a lower degree of electron backdonation to the adsorbate. In the special case of electrodeposition, the Stark tuning might be controlled by the electronic structure of the metal clusters that are being formed.…”

“…The vibrational behaviour of Au-CN, Au 6 -CN À , Au 8 -CN À , Au 10 -CN À and Au 12 -CN À cluster-adsorbate systems was studied, as well as the Stark shift of cyanide system. The Stark shift effect was simulated by following the approach reported in [11]: the applied electric field was equal to: À0.01 a.u., À0.005 a.u., 0 a.u., 0.005 a.u. and 0.01 a.u.…”

“…In [11] from periodic DFT calculations it is concluded that the mode observed at 2100 cm À1 corresponds to the stretch vibration of CN adsorbed atop on (1 0 0) and (1 1 0) sites; higher wavenumbers are predicted for adsorption on (1 1 1) sites.…”

Probing Ionic Diffusion Dynamics through the Modulation of Polymer Shell Using Surface-Enhanced Raman Spectroscopy

“…As the AuNPs are being etched by the cyanide ions, soluble ions of Au(CN)2-will be formed. This ion was also found to be SERS active and will produce a Raman signal, of a high frequency mode, at ~2100 cm -1 [20]. Thus on this basis, we were able to monitor the ionic diffusion of cyanide in situ.…”