Optical characterization of oligo(phenylene-ethynylene) self-assembled monolayers on gold

Lee J. Richter, Clayton S.C. Yang, Philip T. Wilson, Christina A. Hacker, Roger D. Van Zee, Joshua J. Stapleton, David L. Allara, Yuxing Yao, James M. Tour

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58 Scopus citations

Abstract

Vibrationally resonant sum-frequency generation (VR-SFG) and spectroscopic ellipsometry (SE) have been used to characterize self-assembled monolayer films of unsubstituted and mononitro-substituted oligo(phenylene-ethynylene) molecules on vapor-deposited Au substrates. When combined with quantum chemical calculations of the relevant transition moment directions, orientation distributions and electronic excitation spectra are obtained. The orientation distribution from VR-SFG is in good agreement with previous IR reflection studies, indicating both molecules are tilted from the surface normal by ∼30°. The calculated resonant hyperpolarizabilities are in good agreement with experimental spectra. The optical polarizability extracted from SE suggests strong intermolecular interactions, consistent with molecular exciton theory.

Original languageEnglish (US)
Pages (from-to)12547-12559
Number of pages13
JournalJournal of Physical Chemistry B
Volume108
Issue number33
DOIs
StatePublished - Aug 19 2004

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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