Characterization of ultrathin electroactive films synthesized via the self-limiting electropolymerization of o-methoxyaniline |
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Authors: | Anne E Fischer Jeffrey W Long |
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Affiliation: | Code 6170, Surface Chemistry Branch, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, United States |
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Abstract: | The electropolymerization of o-methoxyaniline under self-limiting deposition conditions yields ultrathin (<20 nm) coatings of an insoluble, low-molecular-weight polymer on planar indium-tin-oxide electrode substrates. The self-limiting nature of the electropolymerization is achieved by using citrate-buffered aqueous electrolytes (pH 4.7) in which the developing polymer that deposits at the electrified interface is neither conductive nor permeable to monomer. Although non-conductive as electrodeposited, the resulting poly(o-methoxyaniline) coating becomes electroactive when transferred to acidic aqueous electrolytes. The morphology and chemical structure of the poly(o-methoxyaniline) coatings are characterized by surface-sensitive methods including atomic force microscopy, specular-reflectance infrared spectroscopy, X-ray photoelectron spectroscopy, and electrochemistry. Fundamental understanding of the structure/property relationships derived from these investigations on planar substrates will ultimately be applied to three-dimensional electrode nanoarchitectures that incorporate such electroactive coatings for enhanced charge-storage functionality. |
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Keywords: | Conducting polymer Redox polymer Poly(o-methoxyaniline) Energy storage Self-limiting |
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