| Project/Area Number |
04453080
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業物理化学・複合材料
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
YAMABE Tokio Kyoto Univ.Mol.Eng.Professor, 工学研究科, 教授 (80025965)
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| Co-Investigator(Kenkyū-buntansha) |
MISAKI Yohji Kyoto Univ.Mol.Eng.Assoc.Prof., 工学研究科, 助教授 (90202340)
TACHIBANA Akitomo Kyoto Univ.Phys.Eng.Professor, 工学研究科, 教授 (40135463)
TANAKA Kazuyoshi Kyoto Univ.Mol.Eng.Professor, 工学研究科, 教授 (90155119)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1993: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1992: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Fullerene / Electronic state / Magnetic property / Ferromagnetic correlation / Multi-fullerene / Backy tube / Solid-state property / Spin state |
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| Research Abstract |
Electronic properties of bucky tube modelled by a sheet of helical graphite cylinder named "grahelix" have been examined based on the one-dimensional tight-binding crystal orbital method in the framework of the Huckel approximation. It has been found that there are two types of grahelix depending on the helical pitch, that is, one is energetically stable and semiconductive whereas the other less stable with metallic nature.
Moreover we elucidate that such metallic tubes are equivalent to those involving plural numbers of isolated cis-type polyacetylene skeletons arranged mostly in a helical manner on the tube surface. Such helical polyacetylene skeletons guarantee the metallic conduction path to the electrons near the Fermi level (spiralons). Control of the flow of these spiralons may open up a stage for nano-technology of the electronic devices such as molecular solenoid applicable to molecular electromagnet, molecular electric generator and so on.
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