Characterization of Photooxidized Self-Assembled Monolayers and Bilayers by Spontaneous Desorption Mass Spectrometry

We show that selected self-assembled monolayers (SAMs) and bilayers are readily characterized by the application of controlled photooxidation and spontaneous desorption mass spectrometry (SDMS) in the negative ion mode. Additionally, SDMS is used to characterize organic and inorganic anionic species...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2000-12, Vol.72 (24), p.5973-5980
Main Authors: English, Robert D, Van Stipdonk, Michael J, Sabapathy, Rajaram C, Crooks, Richard M, Schweikert, Emile A
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Ions
Molecules
Oxidation
Scientific imaging
Solid-liquid interface
Surface physical chemistry
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Summary:We show that selected self-assembled monolayers (SAMs) and bilayers are readily characterized by the application of controlled photooxidation and spontaneous desorption mass spectrometry (SDMS) in the negative ion mode. Additionally, SDMS is used to characterize organic and inorganic anionic species adsorbed to the surface of a positively charged SAM surface, 2-aminoethanethiol (AET). Prominent peaks are observed that correspond both to the sulfonate form of each SAM and bilayer and to the anion form of each molecule adsorbed to AET. In addition, fragments of the oxidized thin films were also observed at m/z 80 (SO3 -) and 97 (HSO4 -). Other prominent fragment peaks more characteristic of the molecule are also seen in the mass spectra.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac0008892