IR-Visible Sum-Frequency vibrational spectroscopy of biphenyl-3 methylene thiol monolayer on gold and silver: effect of the visible wavelength on the SFG spectrum

Christophe Humbert, Laurent Dreesen, Alaa Addin Mani, Yves Caudano, Jean-Jacques Lemaire, Paul Thiry, André Peremans

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Résumé

We measured IR-visible sum-frequency generation spectra of CH3-(C6H4)(2)-(CH2)(3)-S-H (Biphenyl-3) self-assembled monolayers on a silver and a gold substrate. For the latter substrate, we observed different interference patterns between the resonant signal of the CH vibration and the non-resonant contribution of the substrate as a function of the visible beam wavelength. The non-linear response of the gold substrate is enhanced around 480 nm corresponding to the s-d interband transition. Such effect is not observed for the silver substrate the interband transition of which is located out of the investigated visible spectral range of 450-700 nm.
langue originaleAnglais
Pages (de - à)203-207
Nombre de pages5
journalSurface Science
Volume502
Etat de la publicationPublié - 2002

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