Surface enhanced Raman spectra of isomeric phenetidines in silver colloids
| Autor: | T. N. Misra, Kana M. Mukherjee, S.K Nandy, A.K Maity |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Chemistry
Analytical chemistry Physics::Optics Atomic and Molecular Physics and Optics Spectral line Analytical Chemistry Metal Condensed Matter::Materials Science Colloid symbols.namesake Adsorption Chemisorption visual_art Physics::Atomic and Molecular Clusters symbols visual_art.visual_art_medium Physical chemistry Molecule Physics::Chemical Physics Raman spectroscopy Instrumentation Spectroscopy Raman scattering |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 52:5-11 |
| ISSN: | 1386-1425 |
| Popis: | Raman scattering from ortho-, meta- and para -phenetidines in solution and in surface adsorbed state on colloidal silver have been investigated. Comparison of the spectra in solution and in silver sol shows large enhancement of the Raman scattering from the molecules adsorbed on the silver surface. Correlation of Raman enhancement of the molecules with their Hammett σ parameters suggests that charge transfer (CT) between the metal and the molecule may have significant contribution to surface enhanced Raman spectra (SERS). Dependence of SERS intensity on the concentration of molecules in the silver sol suggests “first layer effect” and chemisorption of the molecules on silver surface. Molecular orientation on the silver surface is also discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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