Raman spectroscopy of aromatic acids adsorbed on oxidised aluminium foil

  • Klug O
  • Parlagh G
  • Forsling W
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Abstract

Adsorption of ortho- and para-phthalic acids on oxidised aluminium foil was investigated by Raman and surface-enhanced Raman spectroscopy (SERS). Without any treatment of the foil only a modified method of SERS provided spectroscopic evidence of the adsorption. However, by dissolving the metal aluminium from the Al2O3-Al-Al2O3structure of the foil, the adsorption could be investigated by Raman spectroscopy without surface-enhanced conditions. The vibrational bands of the adsorbed species, obtained by both types of Raman spectroscopy, are compared to the solid-state spectra of the pure acids and their dipotassium salts. The hand shifts suggest that the adsorbed species are essentially in the carboxylate form; however, the Raman and the SER spectra of the same species are not identical indicating a separate chemical reaction occurring at the surface upon depositing the sol.

Author-supplied keywords

  • Adsorption
  • Phthalic acid
  • Raman spectroscopy
  • SERS
  • γ-Aluminium oxide

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Authors

  • O. Klug

  • Gy Parlagh

  • W. Forsling

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