Journal ArticleDOI
Characterization of a tantalum capacitor fabricated with a conducting polypyrrole as a counter electrode
Masaharu Satoh,Hitoshi Ishikawa,Kosuke Amano,Etsuo Hasegawa,K. Yoshino +4 more
- Vol. 71, pp 2259-2260
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TLDR
In this article, a tantalum solid electrolytic capacitor using a conducting polypyrrole counter electrode has been investigated on the current-voltage characteristics at various temperatures, showing the features of an ideal capacitor, meaning a constant capacitance and proportion al decrease of impedance with frequency up to the resonance point.Abstract:
Summary form only given. A tantalum solid electrolytic capacitor using a conducting polypyrrole com posite as a counter electrode has been investigated on the current-voltage characteristics at various temperatures. The capacitor demonstrates the features of an ideal capacitor, meaning a constant capacitance and proportion al decrease of impedance with frequency up to the resonance point. The leak age current at the working voltage is nearly two orders of magnitude smaller than of a conventional tantalum capacitor using a MnO/sub 2/ electrode. The resistance changes along the curve expected from the variable range hopping model similarly to the case of polypyrrole alone. The current-voltage curve follows the Schottky or Pool-Frenkel emission process and shows that the area and depth of the defects on dielectric (Ta/sub 2/O/sub 5/) layers are smaller than those of the conventional tantalum capacitor. Furthermore, the healing effect is observed for broken samples. In this case, the current decreases dramatically by applying the working voltage.read more
Citations
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Journal ArticleDOI
Performance evaluation of poly 3-(phenylthiophene) derivatives as active materials for electrochemical capacitor applications
TL;DR: In this paper, the performance of polymers from 3-(4-fluorophenyl)thiophene, 3-(3,4-dimethylsulfonylphenyl), 3-cyanophenyl, 3-4-methylsulfonyl, and 3-3-difluor-phenyl thiophene was investigated using cyclic voltammetry in both the p-and n-doping regimes.
Journal ArticleDOI
Simultaneous electrochemical formation of Al2O3/polypyrrole layers (I) : effect of electrolyte anion in formation process
TL;DR: In this paper, the capability of various kinds of sulfonate-based electrolytes to form a bilayered Al2O3/polypyrrole (PPy) film on an aluminum substrate in aqueous solution was studied.
Journal ArticleDOI
Preparation and characterization of Ppy/Al2O3/Al used as a solid-state capacitor
TL;DR: In this paper, the characteristics of a solid-state capacitor based on Ppy (polypyrrole)/Al 2 O 3 /Al prepared by the constant-current method are investigated, and three stages are defined from the relationship between the potential and the electrolysis time in simultaneously preparing the dielectric layer and the conducting polymer (Ppy) on Al foil etched with 0.1 M NaOH.
Journal ArticleDOI
Electrochemical synthesis of polypyrrole/polyimide conducting composite using a polyamic acid precursor
Jude O. Iroh,Kirill L. Levine +1 more
TL;DR: In this paper, a conducting polymer/poly(amic acid) composites were synthesized by casting polyamic acid (PAAc) film onto the surface of stainless steel followed by electrochemical deposition of polypyrrole.
Book ChapterDOI
Spectroelectrochemistry of conducting polymers
TL;DR: In this paper, the spectroscopic evidence obtained in investigations of these processes are considered because of the central importance of protonation for the occurrence of electronic conductivity in PANI.
References
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Journal ArticleDOI
The application of polypyrrole as counterelectrode in electrolytic capacitors
TL;DR: In this paper, the dopant counterions of polypyrrole electrode were varied and the influence on capacitor performance related to differences in material properties was investigated, and it was verified both for zero-hour characteristics as for lifetime experiments at 125 °C in air.
Journal ArticleDOI
Highly conducting polypyrrole prepared from homogeneous mixtures of pyrrole/oxidizing agent and its applications to solid tantalum capacitors
TL;DR: In this article, the reaction parameters for the cationic oxidative polymerization of pyrrole are investigated for the preparation of a highly conductive material for electronic devices, which is successfully used for the formation of the counter electrode of a tantalum solid capacitor.
Journal ArticleDOI
Electronic properties of mislinked polypyrrole and polythiophene
TL;DR: In this paper, the electronic properties of polypyrrole and polythiophene involving α-β linkages have been studied using the one-dimensional tight-binding SCF-CO (self consistent field-crystal orbital) method.
Journal ArticleDOI
Frequency and Time Sources-Past, Present, and Future
TL;DR: In this article, the history of frequency control and timekeeping is briefly described and technologies involved in the latest classical and quantum mechanical standards are discussed, with a discussion of present capabilities.