1998 Fiscal Year Final Research Report Summary
Induction current of conducting polymers in magnetic field
| Project/Area Number |
08650974
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
工業物理化学
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| Research Institution | Fukui University |
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Principal Investigator |
AOKI Koichi Fukui University, Department of Applied Physics, Professor, 工学部, 教授 (80142264)
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| Project Period (FY) |
1996 – 1998
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| Keywords | magnetic effect / induced current / polyaniline / conducting polymers / scattering light / fructal |
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| Research Abstract |
We found that a polyaniline film in the electrically conducting state induced current when it was in magnetic field. The current was not detected when the film was resistive. Since it increased stepwise at a percolation threshold potential, it cannot be explained by ordinary magnetic effects by Lorentz force. It may be caused by molecular coils of the conducting state.
The induced current varied with intensity with the magnetic field, the magnetic frequency, thickness of the film, a doping level, and pH of the solution. It seems to be related with a macroscopic size of conducting domains. As an extension of the magnetic field effect, we developed measurements of scattering light in order to determine the size of the macroscopic domains. A visible laser was shone on the potentiostated polyaniline films, and the scattering light intensity was detected as a function of scattering angles. The scattering light was not due to Raleigh scattering but included interference, By the analysis of variaqtion of the light intensity with the angles, we found the presence of conducting clusters 5 mum in diamter, which could be detcted through a microscope. The size increased with a time of potential application, showing a linear variation of the size with the logarithmic time.
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