Identification of species formed after pyridine adsorption on iron, cobalt, nickel and silver electrodes by SERS and theoretical calculations

Autor(es)

Andrade, Gustavo F. S. ^[1] ; Temperini, Marcia L. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Lab Espectroscopia Mol, BR-05513970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Raman Spectroscopy; v. 40, n. 12, p. 1989-1995, DEC 2009.
• Citações Web of Science: 19

Resumo

The adsorption of pyridine (py) on Fe, Co, Ni and Ag electrodes was studied using surface-enhanced Raman scattering (SERS) to gain insight into the nature of the adsorbed species. The wavenumber values and relative intensities of the SERS bands were compared to the normal Raman spectrum of the chemically prepared transition metal complexes. Raman spectra of model clusters M(4)(py) (four metal atoms bonded to one py moiety) and M(4)(alpha-pyridil) where M = Ag, Fe, Co or Ni were calculated by density functional theory (DFT) and used to interpret the experimental SERS results. The similarity of the calculated M(4)(py) spectra with the experimental SERS spectra confirm the molecular adsorption of py on the surface of the metallic electrodes. All these results exclude the formation of adsorbed alpha-pyridil species, as suggested previously. Copyright (C) 2009 John Wiley \& Sons, Ltd. (AU)

• Processo FAPESP: 07/52262-8 - Síntese e aplicações de filmes finos de metais de transição como substratos SERS de alto desempenho
• Beneficiário: Gustavo Fernandes Souza Andrade
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 03/00411-9 - Espectroscopia raman de adsorbatos em superficies metalicas.
• Beneficiário: Gustavo Fernandes Souza Andrade
• Modalidade de apoio: Bolsas no Brasil - Doutorado