Journal
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume 36, Issue 6, Pages 1637-1644Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/bkcs.10311
Keywords
Ellagic acid; Surface-enhanced Raman scattering; Silver colloids; Vibrational frequencies; Density functional theory
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Funding
- University of Incheon Research Grant
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Surface-enhanced Raman scattering (SERS) spectroscopy has been applied for the vibrational characterization of ellagic acid (EA), a natural organic dye, using citrate-reduced silver colloids. The infrared and FT-Raman spectra of EA in the solid state were examined for comparison. Spectral assignments of the observed bands were aided by density functional theory (DFT) calculations employing the B3LYP functional. The variations in the SERS spectrum with pH and excitation wavelength were analyzed to gain information on the adsorption- and pH-dependent behaviors of the natural dye on the metal surface. On the basis of the observed spectral features and DFT calculations, the adsorption configuration of EA on the silver metal surface is proposed.
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