Surface-enhanced Raman scattering (SERS) spectra of 1-methyl-2-pyrrolidinone molecules adsorbed on rough silver surfaces have been obtained. A strong signal due to AgN vibrations has been found at 240 cm(-1) from molecules chemically bonded at the silver surface. A band in the CH-stretching region has been used to quantify molecules present on top of the first layer as a consequence of weaker interactions. These latter molecules have been removed with distilled water, allowing evaluation of the ratio between the SERS cross-section for 'physisorption' and 'chemisorption'. A difference in the selection rules between normal Raman and SERS has also been found and briefly discussed. (C) 1998 Published by Elsevier Science B.V.
A SERS study of 1-methyl-2-pyrrolidinone adsorbed on active silver surfaces
COMPAGNINI, Giuseppe Romano;
1998-01-01
Abstract
Surface-enhanced Raman scattering (SERS) spectra of 1-methyl-2-pyrrolidinone molecules adsorbed on rough silver surfaces have been obtained. A strong signal due to AgN vibrations has been found at 240 cm(-1) from molecules chemically bonded at the silver surface. A band in the CH-stretching region has been used to quantify molecules present on top of the first layer as a consequence of weaker interactions. These latter molecules have been removed with distilled water, allowing evaluation of the ratio between the SERS cross-section for 'physisorption' and 'chemisorption'. A difference in the selection rules between normal Raman and SERS has also been found and briefly discussed. (C) 1998 Published by Elsevier Science B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
