Distinguishing Surface OH and NHx Using TFAA Derivatization and XPS

TFAA has been used widely for the derivatization of hydroxyl groups in XPS of organic polymers. Unfortunately, in the presence of other nucleophilic groups at the surface like amino groups, these also react with TFAA and a quantification of the different functional group concentrations is impossible...

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Bibliographic Details
Published in:Plasma processes and polymers 2008-06, Vol.5 (4), p.345-349
Main Authors: Holländer, Andreas, Pippig, Falko, Dubreuil, Marjorie, Vangeneugden, Dirk
Format: Article
Language:English
Subjects:
Amines
Applied sciences
atmospheric-pressure discharge
Boundary element method
coating
Derivatives
derivatization
ESCA/XPS
Exact sciences and technology
Hydroxyl groups
Mathematical analysis
Organic polymers
Physicochemistry of polymers
Polymers
Properties and characterization
Structure, morphology and analysis
surface composition
Trifluoroacetates
X-ray photoelectron spectroscopy
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Summary:TFAA has been used widely for the derivatization of hydroxyl groups in XPS of organic polymers. Unfortunately, in the presence of other nucleophilic groups at the surface like amino groups, these also react with TFAA and a quantification of the different functional group concentrations is impossible. It has been found that the TFAA derivatives of hydroxyl groups and amines, namely the trifluoroacetate and the trifluoroamide, respectively, can be distinguished by the BE of the CF3 component in the C1s spectrum. While in a trifluoroacetamide the BE is about 292.3 eV, in a trifluoroacetate it can be as high as 294.2 eV in the case of densely packed hydroxyl groups.
ISSN:1612-8850
1612-8869
1612-8869
DOI:10.1002/ppap.200700167