Tuning the Work Function of Gold with Self-Assembled Monolayers Derived from X-[C6H4-C≡C-]nC6H 4-SH (n = 0, 1, 2; X = H, F, CH3, CF3, and OCH3)

Robert W. Zehner, Bradley F. Parsons, Richard P. Hsung, Lawrence R. Sita

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Abstract

Changes in the work function of gold, ΔΦA12, induced by the formation of chemisorbed self-assembled monolayers derived from the series of titled arenethiol adsorbates X - (C6H4 - C≡C-)nC6H4-SH (1, n = 0; 2, n = 1; 3, n =2) have been measured by the Kelvin probe method. An analysis of these data indicates that variation in work function for a given chain length can be effectively modeled with two dipole sheets, as has been shown for other classes of self-assembled monolayers. Importantly, it is shown that monolayers of class 1 produce larger relative changes in work function for a given substituent X than those of either 2 or 3, presumably as a result of the larger polarizability of the longer chains present in the latter. Accordingly, these commercially available adsorbates are attractive for use in device applications requiring work function modification.

Original languageEnglish (US)
Pages (from-to)1121-1127
Number of pages7
JournalLangmuir
Volume15
Issue number4
DOIs
StatePublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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