Self-assembled multilayers of 4,4′-dimercaptobiphenyl formed by Cu(II)-catalyzed oxidation

Tina Louise Brower, Jayne C. Garno, Abraham Ulman, Gang-yu Liu, Chun Yan, Armin Gölzhäuser, Michael Grunze

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Self-assembled multilayers were prepared by alternate deposition of 4,4′-dimercaptobiphenyl (DMBP) and copper(II) ions onto planar Au(111) substrates. The multilayers were characterized by ellipsometry, external reflectance Fourier transform infrared spectroscopy (ER-FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). Ellipsometry and ER-FTIR results show a linear relationship between the number of layers and the integral area of absorption characteristic of vibrational modes assigned to the biphenyl moieties. XPS data suggest that the copper is present in the +1 and +2 oxidation states in bulk material made by the reaction of DMBP and Cu(II) ions in solution, and only in the +1 state in multilayer films. XPS results also indicate a linear relationship between the number of DMBP layers and film thickness. AFM studies provided details about the surface morphology. In addition, thickness was measured precisely via nanoshaving and nanografting techniques. On the basis of the combination of these techniques, it is proposed that the DMBP multilayer system is formed by interlayer disulfide linkages.

Original languageEnglish (US)
Pages (from-to)6207-6216
Number of pages10
JournalLangmuir
Volume18
Issue number16
DOIs
StatePublished - Aug 6 2002
Externally publishedYes

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

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    Brower, T. L., Garno, J. C., Ulman, A., Liu, G., Yan, C., Gölzhäuser, A., & Grunze, M. (2002). Self-assembled multilayers of 4,4′-dimercaptobiphenyl formed by Cu(II)-catalyzed oxidation. Langmuir, 18(16), 6207-6216. https://doi.org/10.1021/la020084k