Formation and redox behaviour of polycarbazole prepared by electropolymerization of solid carbazole crystals immobilized on an electrode surface

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Abstract

Carbazole solid crystals have been mechanically attached to platinum or gold electrodes by two different methods and investigated by cyclic electrochemical quartz crystal microbalance measurements in the presence of aqueous acidic media. It was demonstrated that oxidative dimerization and polymerization can also be accomplished under such conditions. During electropolymerization, anions and water molecules enter the surface layer; however, these species leave the film after the reduction of the polymer formed. The mass changes observed in the course of the redox transformations of polycarbazole film can be explained by potential- and time-dependent sorption/desorption of H+ and ClO4- ions. The electroactivity of the polymer diminishes in more dilute acid media; however, it is recovered again in concentrated HClO4 solutions. In more dilute acid solution the extent of the water sorption (film swelling) increases.

Original languageEnglish
Pages (from-to)503-510
Number of pages8
JournalJournal of Solid State Electrochemistry
Volume7
Issue number8
DOIs
Publication statusPublished - Aug 2003

Fingerprint

Electropolymerization
carbazoles
sorption
Crystals
Electrodes
electrodes
Sorption
Polymers
crystals
acids
Acids
Dimerization
Water
Quartz crystal microbalances
polymers
dimerization
Platinum
quartz crystals
Gold
swelling

Keywords

  • Carbazole
  • Electrochemical quartz crystal microbalance
  • Electropolymerization
  • Microcrystals

ASJC Scopus subject areas

  • Electrochemistry

Cite this

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abstract = "Carbazole solid crystals have been mechanically attached to platinum or gold electrodes by two different methods and investigated by cyclic electrochemical quartz crystal microbalance measurements in the presence of aqueous acidic media. It was demonstrated that oxidative dimerization and polymerization can also be accomplished under such conditions. During electropolymerization, anions and water molecules enter the surface layer; however, these species leave the film after the reduction of the polymer formed. The mass changes observed in the course of the redox transformations of polycarbazole film can be explained by potential- and time-dependent sorption/desorption of H+ and ClO4- ions. The electroactivity of the polymer diminishes in more dilute acid media; however, it is recovered again in concentrated HClO4 solutions. In more dilute acid solution the extent of the water sorption (film swelling) increases.",
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T1 - Formation and redox behaviour of polycarbazole prepared by electropolymerization of solid carbazole crystals immobilized on an electrode surface

AU - Inzelt, G.

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N2 - Carbazole solid crystals have been mechanically attached to platinum or gold electrodes by two different methods and investigated by cyclic electrochemical quartz crystal microbalance measurements in the presence of aqueous acidic media. It was demonstrated that oxidative dimerization and polymerization can also be accomplished under such conditions. During electropolymerization, anions and water molecules enter the surface layer; however, these species leave the film after the reduction of the polymer formed. The mass changes observed in the course of the redox transformations of polycarbazole film can be explained by potential- and time-dependent sorption/desorption of H+ and ClO4- ions. The electroactivity of the polymer diminishes in more dilute acid media; however, it is recovered again in concentrated HClO4 solutions. In more dilute acid solution the extent of the water sorption (film swelling) increases.

AB - Carbazole solid crystals have been mechanically attached to platinum or gold electrodes by two different methods and investigated by cyclic electrochemical quartz crystal microbalance measurements in the presence of aqueous acidic media. It was demonstrated that oxidative dimerization and polymerization can also be accomplished under such conditions. During electropolymerization, anions and water molecules enter the surface layer; however, these species leave the film after the reduction of the polymer formed. The mass changes observed in the course of the redox transformations of polycarbazole film can be explained by potential- and time-dependent sorption/desorption of H+ and ClO4- ions. The electroactivity of the polymer diminishes in more dilute acid media; however, it is recovered again in concentrated HClO4 solutions. In more dilute acid solution the extent of the water sorption (film swelling) increases.

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KW - Electrochemical quartz crystal microbalance

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KW - Microcrystals

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