Ordering of Air-Oxidized Decanethiols on Au(111)

Kai Sotthewes* (Corresponding Author), Özlem Kap, Hairong Wu, Damien Thompson, Jurriaan Huskens, Harold J.W. Zandvliet

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
50 Downloads (Pure)

Abstract

Self-assembled monolayers (SAMs) of alkanethiols on gold are a commonly used platform for nanotechnology owing to their ease of preparation and high surface coverage. Unfortunately, the gold-sulfur bond is oxidized at ambient conditions which alters the stability and structure of the monolayer. We show using scanning tunneling microscopy and X-ray photoelectron spectroscopy that decanethiolate molecules oxidize into decanesulfonates that organize into a hitherto unknown striped phase. Air-exposed SAMs oxidize, as can be determined by a shift of the S 2p peak and the appearance of O 1s photoelectrons as part of the decanethiol monolayer transforms into a lamellae-like decanesulfonate structure when exposed to air. The herringbone structure of the Au(111) surface is preserved, indicating that the interaction between the molecules and the surface is rather weak as these findings are substantiated by density functional theory calculations.

Original languageEnglish
Pages (from-to)8430-8436
Number of pages7
JournalJournal of physical chemistry C
Volume122
Issue number15
DOIs
Publication statusPublished - 19 Apr 2018

Keywords

  • UT-Hybrid-D

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