Sotthewes, K;Kap, O;Wu, HR;Thompson, D;Huskens, J;Zandvliet, HJW

2018

April

Journal Of Physical Chemistry C

Ordering of Air-Oxidized Decanethiols on Au(111)

Published

9 ()

SELF-ASSEMBLED MONOLAYERS SCANNING-TUNNELING-MICROSCOPY TRANSFORM MASS-SPECTROMETRY ALKANETHIOL MONOLAYERS MOLECULAR-DYNAMICS UV PHOTOOXIDATION ULTRAHIGH-VACUUM CHAIN-LENGTH GOLD SURFACES

122

8430

8436

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 is 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.

WASHINGTON

1932-7447

10.1021/acs.jpcc.8b01389