Stabilization of polyaniline films by Surface attachment of oxidizable Substrates
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Date
1997Author
Nyakagwa, Frederick O
Type
ThesisLanguage
esMetadata
Show full item recordAbstract
Cyclic Voltammetry was used to study the Electrochemical properties of PAminophenol
on a Polyaniline modified carbon electrode surface. The resilts reveal
reversible redox waves. The quinone derivatives formed frop P-Aminophenol(PAP)
oxidation seem to depress the rate of degradation of Polyaniline at positive
potentials.
The electrochemical properties of Phenol on a polyaniline modified electrode
were also investigated. The results showed that phenol also stabilises the
polyaniline film at positive potentials above 0.70 V (SCE). The effect of solution pH
on the rate of degradation of the polyaniline film was also investigated. It was
observed that lowering of the solution PH slows down to some extent the rate of
degradation of the polyaniline film. From the degradation data an expression for
calculating the pK of the polyanilne film was derived using Kinetics.
Cyclic Voltammetric analysis of the degradation of metal modified
polyaniline show that Lead deposition in polyaniline suppresses the latter's
electrochemical degradation at positive potentials above 0.70 V (SCE). Tin
modified polyaniline appears to show improved conductivity. Modification of
polyaniline by deposition of silver does not result in a substantial change in the
polyaniline electrochemical characteristics.
Cyclic Voltammetry will be used as a diagnostic tool to assess film behavior
in different environments.
Citation
M.Sc. ThesisSponsorhip
University of NairobiPublisher
Depatment of Chemistry, University of Nairobi
Description
Master of Science Thesis