Lying-down to standing-up transitions in self assembly of butanedithiol monolayers on gold and substitutional assembly by octanethiols

Juanjuan Jia, Subhrangsu Mukherjee, Hicham Hamoudi, Stefano Nannarone, Luca Pasquali, Vladimir A. Esaulov

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Self-assembly of butanedithiol (C4DT) monolayers (SAMs) on gold and substitutional assembly by octanethiols from a lying-down doubly tethered phase of butane dithiol, were investigated in a vacuum evaporation experiment by high-resolution photoemission. The intent was to address the question of transitions from a lying-down to a standing-up phase in dithiol self-assembly and whether a standing-up phase of short chain dithiol can be formed. The lying-down doubly tethered dithiol phase, with both sulfur atoms attached to gold, was formed by evaporation and then exposed to octanethiol molecules. A mixed SAM composed of standing-up octanethiol and dithiol molecules is found to be formed. The degree of dithiol replacement, as evidenced by the increasing thickness of the SAM, is found to augment slowly with increasing exposure to octanethiol. A standing-up C4DT phase was found to be formed upon rapid very large exposure to C4DT vapors. Differences in valence band photoemission between the standing-up and lying-down phases were noted and accounted for theoretically. In all cases, measurements indicate more than one possible adsorption configuration as evidenced by different sulfur binding energies.

Original languageEnglish
Pages (from-to)4625-4631
Number of pages7
JournalJournal of Physical Chemistry C
Volume117
Issue number9
DOIs
Publication statusPublished - 7 Mar 2013
Externally publishedYes

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Photoemission
thiols
Gold
Self assembly
self assembly
Monolayers
Sulfur
assembly
gold
Vacuum evaporation
Molecules
Butane
Valence bands
Binding energy
Evaporation
Vapors
Adsorption
Atoms
sulfur
photoelectric emission

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

Lying-down to standing-up transitions in self assembly of butanedithiol monolayers on gold and substitutional assembly by octanethiols. / Jia, Juanjuan; Mukherjee, Subhrangsu; Hamoudi, Hicham; Nannarone, Stefano; Pasquali, Luca; Esaulov, Vladimir A.

In: Journal of Physical Chemistry C, Vol. 117, No. 9, 07.03.2013, p. 4625-4631.

Research output: Contribution to journalArticle

Jia, Juanjuan ; Mukherjee, Subhrangsu ; Hamoudi, Hicham ; Nannarone, Stefano ; Pasquali, Luca ; Esaulov, Vladimir A. / Lying-down to standing-up transitions in self assembly of butanedithiol monolayers on gold and substitutional assembly by octanethiols. In: Journal of Physical Chemistry C. 2013 ; Vol. 117, No. 9. pp. 4625-4631.
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