Optical characterization of electronic transitions arising from the Au/S interface of self-assembled n-alkanethiolate monolayers

J. Shi, B. Hong, A. N. Parikh, R. W. Collins, D. L. Allara

Research output: Contribution to journalArticle

81 Scopus citations

Abstract

Analyses of optical frequency ellipsometric spectra obtained in situ upon completion of the self-assembly of n-alkanethiolate monolayers on gold substrates immersed in methanol reveal the presence of a 1.2 ± 0.4 A ̊ thick S/Au interface layer. This layer exhibits unique optical transitions, modeled as two Lorentzian oscillators with imaginary parts peaked at ≈ 570 nm (≈ 2.2 eV) and ≈ 290 nm (≈ 4.3 eV), indicating a perturbation of the near-surface gold electronic structure upon thiol chemisorption. A further, more rigorous, spectral analysis involving an anisotropic, uniaxially oriented chain assembly reveals the presence of significant microscopic void defects in the otherwise densely packed monolayers.

Original languageEnglish (US)
Pages (from-to)90-94
Number of pages5
JournalChemical Physics Letters
Volume246
Issue number1-2
DOIs
StatePublished - Nov 17 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

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