Molecule orientation in self-assembled monolayers determined by infrared-visible sum-frequency generation spectroscopy

A. A. Mani, Z. D. Schultz, B. Champagne, C. Humbert, L. Dreesen, A. A. Gewirth, J. O. White, P. A. Thiry, A. Peremans, Y. Caudano

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Résumé

The molecular orientation in self-assembled monolayers of thiophenol (TP) on Ag(1 1 1) and of para-nitroanilinododecane-thiol (NAT) on Au was investigated by infrared-visible sum-frequency generation between 500 and 1500 cm -1. Ab initio calculations were performed to determine the interface nonlinear response. The combined experimental and theoretical results reveal that the S-C bond of TP is tilted 37° from the Ag(1 1 1) surface normal, with the aromatic ring plane perpendicular to the surface. On Au, the tilt angle of the NAT molecule stabilizes below 60° at the end of film growth.

langue originaleAnglais
Pages (de - à)444-449
Nombre de pages6
journalApplied Surface Science
Volume237
Numéro de publication1-4
Les DOIs
Etat de la publicationPublié - 15 oct. 2004

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