Evidence for surface Ag+ complexes as the SERS-active sites on Ag electrodes
โ Scribed by T. Watanabe; O. Kawanami; K. Honda; B. Pettinger
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 629 KB
- Volume
- 102
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
Evidence is given that SERS-active sites at Ag electrodes are associated with Ag+ ions, forming sparingly soluble surface complc~cs with ligands such as pyridinc molcculcs and halide ions. Such surface A$ coniplcses contribute a factor of >800 to the overall (107-fold) enhancenient, possibly via a resonance Raman effect.
๐ SIMILAR VOLUMES
An analysrs of SER spectra for pyridlne in Ha0 and Da0 electrolytes yrelds overtones for SIX ar fundamentals very clo.ce to the expected frequency and many combination modes in addition to other unidentified vibratrons. All these bands are weak in intensity, but by overiap they form a lar8e part of
## SERS from pyridine on an Ag clccrrode is almost complcrely quenched by underpotential deposition of Tl 10 a surface covemgc of J 3%. Removal of Tl by anodic stripping does not restore the original SERS intensity. These results susest that only a small fraction of adsorbed pyridine molecules is