Studies in the Electrical Double Layer at Metal/Polymer Interfaces by Scanning Capacitive Probe

A scanning capacitive probe (the Kelvin probe) is applied to studying metal/polymer contacts. Potential drop across the electrical double layer of oriented ionic dipoles at the metal/polymer interface was shown to mainly contribute to measured Volta potentials. Amino groups of epoxy coatings are pro...

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Bibliographic Details
Published in:Protection of metals 2003-01, Vol.39 (1), p.55-62
Main Authors: Nazarov, A P, Thierry, D
Format: Article
Language:English
Subjects:
Charge
Charging
Coatings
Double layer
Electric potential
Fermi level
Fermi surfaces
Scanning
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Summary:A scanning capacitive probe (the Kelvin probe) is applied to studying metal/polymer contacts. Potential drop across the electrical double layer of oriented ionic dipoles at the metal/polymer interface was shown to mainly contribute to measured Volta potentials. Amino groups of epoxy coatings are protonated upon their interaction with hydroxylated metal surfaces; being positively charged, they reduce the Volta potential of the metals. Acid groups of alkyd coatings acquire a negative charge and increase the Volta potentials of the metals. Polyaniline (an electron-conducting polymer) accepts metal's electrons to its Fermi level, thus producing a Schottky barrier. In this case, the potential at the contact does not depend on the metal nature; it approaches the aniline intrinsic redox-potential.[PUBLICATION ABSTRACT]
ISSN:2070-2051
0033-1732
2070-206X
1608-327X
DOI:10.1023/A:1021995208966