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

76 Citations (Scopus)

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

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Gold
Monolayers
gold
Optical transitions
Chemisorption
electronics
optical transition
Sulfhydryl Compounds
thiols
Spectrum analysis
chemisorption
Self assembly
Electronic structure
spectrum analysis
Methanol
self assembly
voids
methyl alcohol
assembly
oscillators

ASJC Scopus subject areas

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

Cite this

Optical characterization of electronic transitions arising from the Au/S interface of self-assembled n-alkanethiolate monolayers. / Shi, J.; Hong, B.; Parikh, A. N.; Collins, R. W.; Allara, D. L.

In: Chemical Physics Letters, Vol. 246, No. 1-2, 17.11.1995, p. 90-94.

Research output: Contribution to journalArticle

Shi, J. ; Hong, B. ; Parikh, A. N. ; Collins, R. W. ; Allara, D. L. / Optical characterization of electronic transitions arising from the Au/S interface of self-assembled n-alkanethiolate monolayers. In: Chemical Physics Letters. 1995 ; Vol. 246, No. 1-2. pp. 90-94.
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