Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 111, Issue 49, Pages 18010-18017Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp074002i
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Analysis of surface enhanced Raman scattering spectra from 20 different molecules adsorbed on substrates composed of silver nanoparticles immobilized on silver mirror films revealed competitive Raman enhancement from different types of molecules simultaneously present on the surface. The observed SERS behavior could not be explained using local field enhancement or charge-transfer models. A different SERS mechanism is proposed based on plasmon-induced electronic coupling between the oscillating electrons in the metal and the electronic system of adsorbed molecules. It is suggested that this mechanism has general applicability to other SERS-exhibiting systems.
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