|Formation of cyanide compounds during preparation
of gold surfaces evidenced by surface‐enhanced
Raman spectroscopy |
Auteur(s): Merlen Alexandre, Pardanaud Cedric, Coussin Stéphane, Panagiotopoulos C., Grauby Olivier, Ruiz Carmen
(Article) Publié: Journal Of Raman Spectroscopy, vol. p.1-6 (2018)
Ref HAL: hal-01770401_v1
Exporter : BibTex | endNote
We report Surface Enhanced Raman Spectroscopy (SERS) measurements on nanostructured gold surfaces prepared using a primary vacuum sputtering technique. Even if no molecules have been deposited on the metallic surface a clear Raman signal is observed. A very intense and sharp peak around 2100 cm-1 together with low frequency modes are visible. The comparison between the experimental spectra and those obtained using Density functional theory (DFT) calculations confirms that these new modes are associated to the cyanide compound Au(CN)2-. This proves the high sensitivity of SERS for the chemical analysis of metallic surfaces. It also shows that the pollution should be carefully taken into account in SERS analysis. We also demonstrate that high power laser illumination transform these toxic compounds into carbon species, this method can be used to clean SERS substrates.