Self-assembly of 1,4-benzenedimethanethiol self-assembled monolayers on gold

Hicham Hamoudi, Mirko Prato, Céline Dablemont, Ornella Cavalleri, Maurizio Canepa, Vladimir A. Esaulov

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Abstract

A study of the self-assembly of 1,4-benzenedimethanethiol (BDMT; HS-CH 2-(C6H4)-CH2-SH) monolayers on gold is presented. Self-assembled monolayers (SAMs) are characterized by reflection-absorption infrared spectroscopy (RAIRS), X-ray photoelectron spectroscopy (XPS), and spectroscopic ellipsometry (SE) measurements. The ensemble of measurements consistently shows that well-organized BDMT SAMs, with "standing-up" molecules, can be obtained on high quality gold films with incubation in n-hexane provided that N2-degassed solutions are used and all preparation steps are performed at 60 °C in the absence of ambient light. SE data indicate that the optical interface properties of the BDMT-Au system are different from those of simple alkanethiol SAMs. A possible mechanism for the formation of the "standing-up" phase from the lying-down phase via a hydrogen exchange reaction involving chemisorbed lying-down and free dithiol molecules is discussed.

Original languageEnglish
Pages (from-to)7242-7247
Number of pages6
JournalLangmuir
Volume26
Issue number10
DOIs
Publication statusPublished - 18 May 2010

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Hamoudi, H., Prato, M., Dablemont, C., Cavalleri, O., Canepa, M., & Esaulov, V. A. (2010). Self-assembly of 1,4-benzenedimethanethiol self-assembled monolayers on gold. Langmuir, 26(10), 7242-7247. https://doi.org/10.1021/la904317b