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Imaging, work function, and compositional changes of thiols on gold via shadow mask ozonolysis
Author(s) -
Brumbach Michael T.,
Jaye Cherno,
Ohlhausen James T.,
Fischer Daniel
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5264
Subject(s) - xanes , ozonolysis , chemistry , x ray photoelectron spectroscopy , work function , monolayer , absorption (acoustics) , alkyl , spectroscopy , chemical engineering , photochemistry , organic chemistry , materials science , layer (electronics) , composite material , biochemistry , quantum mechanics , engineering , physics
Self‐assembled monolayers (SAMs) of alkyl and fluorinated thiols were investigated after ozonolysis shadow mask treatments with varying areal domains and after exposure to displacing thiols. Imaging near edge X‐ray absorption fine structure (NEXAFS) spectroscopy was used as a novel method for investigating the resulting heterogeneous SAM films. Composition and work function were characterized via X‐ray and ultraviolet photoelectron spectroscopy, respectively. Imaging NEXAFS characterization of these heterogeneous films clearly shows the displacement of oxidized thiols after ozonolysis patterning. Changes in the SAM after patterning, and after displacement from back‐filling thiols, can be inferred from changes in the effective work function. Larger changes in work function were observed for cases where thiols were deposited after ozonolysis suggesting that the displacing SAM was denser and/or more ordered than as‐deposited films. These results highlight one of the first demonstrations of imaging NEXAFS and present measurements of effective work function on intentionally heterogeneous SAM films. Copyright © 2013 John Wiley & Sons, Ltd.