Relative SERS enhancement factors for pyridine adsorbed on a silver electrode. The chemical effect in SERS as a product of charge‐transfer and active‐site mechanisms

Abstract

The relative SERS (surface-enhanced Raman scattering) enhancement factors for pyridine adsorbed on a silver electrode were determined as a function of the laser wavelength and applied potential. The charge-transfer (CT) effect on Raman intensity, C,, was determined by analysing the relative Raman intensity as a function of the potential, taking into account voltagedependent coverage of the silver electrode. The total chemical effect was defined as a product of C , and the so-called 'active-sites' effect and was estimated as equal to about 50.

Influence of drying treatment to electrochemically roughened Ag substrates on the corresponding surface-enhanced Raman scattering performances

“…Interestingly, the value of the quenching SERS effect (ca. 8 times) obtained in this work due to post-drying treatment is similar with that, as reported by Kudelski et al [39]. In their study, the relative SERS enhancement factors for pyridine adsorbed on a silver electrode were determined as a function of the laser wavelength and applied potential.…”

Surface-Enhanced Raman of 1,5-Dimethylcytosine Adsorbed on a Silver Electrode and Different Metal Colloids: Effect of Charge Transfer Mechanism

“…However, the estimation of the separate contributions from each mechanism still remains unknown for most cases, and depends on the nature of both the adsorbate and the metal employed for carrying out the SERS experiments. Many experiments have been carried out to evaluate the contribution from the two mechanisms by using different molecules adsorbed on metal islands films , or metal electrodes, − while on colloids few studies were done in this sense.…”

Spectro-electrochemical study of the influence of ligand adsorption on the reaction rate of the electrodeposition of silver complexes

“…Adsorbed molecules generate SER signals with an intensity depending linearly on their amount present at the surface [11,16], illustrating the potentiality for a quantitative determination of their concentration at the silver electrode. Intensity variations as a function of the electrode potential can however be obscured by the potential dependence of the enhancement process which is at the basis of the SERS effect or by orientation effects [17][18][19][20]. Therefore, the correlation of SER intensity changes with a change of the surface concentration of adsorbed species requires the support of a complementary technique.…”