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Surface‐EnhancedRaman Spectroscopic Studies of Tricyanovinylthiophene in Silver Colloid Solution
Author(s) -
Song OkKeun,
Pauley M. A.,
Wang C. H.,
Jen Alex K.Y.
Publication year - 1996
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199609)27:9<685::aid-jrs17>3.0.co;2-p
Subject(s) - raman spectroscopy , raman scattering , chemistry , molecule , metal , adsorption , colloid , chromophore , salt (chemistry) , inorganic chemistry , polarization (electrochemistry) , analytical chemistry (journal) , photochemistry , optics , organic chemistry , physics
The adsorption behavior of a tricyanovinylthiophene chromophore on a silver metal surface was determined by using the surface‐enhanced Raman scattering (SERS) technique. The salt effect was also examined by using silver colloid. It was found that the molecule is adsorbed through the nitrogen atom of the diphenylamine group in the molecule and the molecular axis lies flat or is tilted on the surface of silver metal. The Raman intensity enhancement of tricyanovinylthiophene without salt is very low compared with that when salt (sodium chloride) is present, suggesting that the interaction between the molecule and metal surface without salt is insufficient to induce a Raman signal. However, with the help of sodium chloride, the Raman signal was dramatically enhanced and behaved like the usual SERS phenomenon. The polarization effect was also studied and all peaks measured were found to be polarized; depolarized peaks were weak in the present experiment.