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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)445-450
Number of pages6
JournalApplied Surface Science
Volume237
Issue number1-4
DOIs
StatePublished - Oct 15 2004

Keywords

  • Adsorbate orientation
  • Para-nitroanilino-dodecanethiol
  • Self-assembled monolayer
  • Sum-frequency generation
  • Thiophenol
  • Vibration

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

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    Mani, A. A., Schultz, Z. D., Champagne, B., Humbert, C., Dreesen, L., Gewirth, A. A., White, J. O., Thiry, P. A., Peremans, A., & Caudano, Y. (2004). Molecule orientation in self-assembled monolayers determined by infrared-visible sum-frequency generation spectroscopy. Applied Surface Science, 237(1-4), 445-450. https://doi.org/10.1016/j.apsusc.2004.07.025