Direct evidence of chemical effect of surface-enhanced Raman scattering observed on electrochemically prepared rough gold substrates

Surface roughness-correlated SERS effect on Au island-deposited substrate

“…The mechanisms of SERS are generally recognized as electromagnetic (EM) enhancement [23,24] and chemical (CHEM) enhancement [25,26]. EM enhancement results from the enhancement of local electromagnetic fields at the surface of a metal which can support surface plasma/optical conduction resonances.…”

Surface-Enhanced Raman Scattering-Active Au/SiO2 Nanocomposites Prepared Using Sonoelectrochemical Pulse Deposition Methods

“…One is electromagnetic (EM) enhancement, 6 which results from the enhancement of local electromagnetic fields at the surface of a metal which can support surface plasma/optical conduction resonances. The other is chemical (CHEM) enhancement, 7 which is associated with the charge transfer between the metal and adsorbate at atomic-scale roughness features. In contrast to the well-known EM, the CHEM remains much more enigmatic and hard to ascertain.…”

In situ surface-enhanced Raman scattering and X-ray photoelectron spectroscopic investigation of coenzyme Q10on silver electrode

“…Since the first SERS spectra were obtained from an electrochemical cell, which led to the discovery of the SERS effect in mid-1970s, 5 SERS has been the subject of many experimental and theoretical investigations of dynamic interface behavior. [6][7][8][9][10][11][12][13][14][15] However, Raman spectroscopy often encounters difficult problems, such as strong fluorescence background from a chromophoric part, unfavorable photoreaction, and insufficient sensitivity. Near-infrared Fourier transform surface-enhanced Raman scattering (NIR-FT-SERS) spectroscopy has recently been used to investigate structural information of biomolecules at the molecular level.…”