1994 Fiscal Year Final Research Report Summary
Molecular Design of Conductor Surfaces
| Project/Area Number |
04044060
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
OYAMA Noboru Tokyo Univ.of Agric.and Technol., Faculty of Technol., Prof., 工学部, 教授 (40134845)
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| Co-Investigator(Kenkyū-buntansha) |
HAMNETT Andrew Univ.of Newcastle upon Tyne, Dept.Chem., prof., 化学部, 教授
ANSON Fred c. California Institute of Technology, Dept.Chem., Prof., 化学部, 教授
TATSUMA Tetsu Tokyo Univ.of Agric.and Technol., Faculty of Technol., Res.Assoc., 工学部, 助手 (90242247)
NAOI Katsuhiko Tokyo Univ.of Agric.and Technol., Faculty of Technol., Assis.Prof., 工学部, 講師 (70192664)
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| Project Period (FY) |
1992 – 1994
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| Keywords | Modified Electrodes / Electrochemistry / Quartz Crystal Resonator / Polymer Complexes / Conducting Polymers |
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| Research Abstract |
Mass and rheological changes of Nafion films deposited on a gold-coated quartz crystal resonator during their loading with Os(bpy)_3^<2+> and its ejection during electrochemical oxidation in sodium acetate buffers were analyzed on the basis of measurements of the electromechanical impedance of the Nafion film-coated resonator. Loading of the Nafion to saturation with Os(bpy)_3^<2+> caused increases in the mass and the rigidity of the film. Electrostatic cross-linking by the doubly-charged Os(bpy)_3^<2+> may be responsible for the rigidity increase. During the first anodic oxidation of the saturated coating, the film mass decreased as Os(bpy)_3 complex was ejected from the coating. After one or two voltammetric cycles a steady state was achieved in which the ionic current at the coating/solution interface was caused by the cyclic ejection and injection of Na^+ ion.
Electrochemical behavior of ion complex films consisting of poly (butyleneviologen) and an anionic amphiphile was studied in NaClO_4 aqueous solutions using quartz crystal resonator. The behavior as well as a visible spectrum of the reduced film changed largely at a NaClO_4 concentration range between 0.05 and 0.1 M,indicating that the film structure changed.
Electrochemical behavior of polypyrrole films in D_2O media was different from that in H_2O media. Upon oxidation, the films were swollen, and the degree of swelling was larger in D_2O media. This difference may be ascribable to different interaction between polypyrrole and the solvents.
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