Surface-enhanced Raman scattering from silver electrodes
Technical Report
·
OSTI ID:6800399
The chemical and physical origins of the anomalously large enhancement of the Raman scattering cross section for molecules adsorbed on silver electrodes in an electrochemical cell were investigated. The effect of the chemical reactions which occur during the anodization/activation procedure were studied using the Ag-CN system. It was shown that the function of the anodization process is to roughen the electrode surface and create an activated site for bonding to the cyanide. A new nonelectrochemical technique for activating the silver surface, along with a study of the enhanced cyanide Raman scattering in different background electrolytes, showed that the Raman active entity on the surface must be a silver-cyanide complex. In order to study the physical mechanism of the enhancement, the angular dependence of the scattered radiation was measured from pyridine adsorbed on an evaporated silver electrode. Both polycrystalline and single crystalline silver films were used. The angular dependence of the scattered radiation from these films showed that the metal surface was controlling the directional properties of the scattered radiation, and not the polarizability tensor of the adsorbate. Based on these experimental results, it was concluded that for weakly roughened silver electrodes the source of the anomalous enhancement is due to a resonant Raman scattering process.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6800399
- Report Number(s):
- IS-T-985; ON: DE83004862
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
25 ENERGY STORAGE
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
ANODIZATION
AZINES
CHEMICAL COATING
CHEMICAL REACTIONS
CORROSION PROTECTION
CYANIDES
DATA
DEPOSITION
ELECTROCHEMICAL CELLS
ELECTROCHEMICAL COATING
ELECTRODES
ELECTROLYSIS
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
INTERFACES
LYSIS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINE
PYRIDINES
RAMAN EFFECT
RAMAN SPECTRA
SILVER
SPECTRA
SURFACE COATING
SURFACE PROPERTIES
TRANSITION ELEMENTS
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
ANODIZATION
AZINES
CHEMICAL COATING
CHEMICAL REACTIONS
CORROSION PROTECTION
CYANIDES
DATA
DEPOSITION
ELECTROCHEMICAL CELLS
ELECTROCHEMICAL COATING
ELECTRODES
ELECTROLYSIS
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
INTERFACES
LYSIS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINE
PYRIDINES
RAMAN EFFECT
RAMAN SPECTRA
SILVER
SPECTRA
SURFACE COATING
SURFACE PROPERTIES
TRANSITION ELEMENTS