[en] 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.
Disciplines :
Physics
Author, co-author :
Mani, A. A.
Schultz, Z. D.
Champagne, B.
Humbert, Christophe
Dreesen, Laurent ; Université de Liège - ULiège > Département de physique > Biophotonique
Gewirth, A. A.
White, J. O.
Thiry, P. A.
Peremans, A.
Caudano, Yves
Language :
English
Title :
Molecule orientation in self-assembled monolayers determined by infrared-visible sum-frequency generation spectroscopy