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Development of Novel Guest Phases Confined in Carbon Based Micropore Space and Their Properties

Development of Novel Guest Phases Confined in Carbon Based Micropore Space and Their Properties
碳基微孔空间新型客体相的开发及其性能
批准号:
08404048
负责人:
ENOKI Toshiaki
金额:
$26.05万
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (A)
财政年份:
1996
资助国家:
日本
项目状态:
已结题
起止时间:
1996 至 1999

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项目成果

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中文摘要
翻译
(1) Nano-graphite derived by the heat-treatment of nano-diamond is investigated in relation to theirstructures,electronic structures and host-guest systems with potassium and bromine From Raman spectra andx - ray diffraction,它发现nano-diamond is converted to nano-graphite around 1600℃。nano-graphite thusobtained has a novel electronic structure featured with non-bonding π-electron states of edgeorigin. The non-bonding edge states play an important role in The spin-lattice relaxation mechanismas fast relaxation centers at the edges. the spin-lattice relaxation process is decelerated in lessgraphitized particles prepared at lower temperatures around 1200℃,可以explained by the presence of remnant sp - D13 - D1 regions. Intercalation of potassiummakes edge states less important in the electronic structure due to charge transfer from potassiumto graphite. The presence of potassium works to增强The spin-orbit interaction.(2)electronic properties of activated carbon fibers are investigatednano-graphite. Heat-treatment induces an insulator-to-metaltransition around 1300℃,due to the development of infinite percolation path networks. In the insulating statethe charging effect works importantly in the electron hopping processwhile the metallic state is featured with a considerable amount of disorder. In the vicinity of theinsulator - to - metal transition,spin-glass-like disordered magnetism appears where spins of edge-inherited non-bonding states areinteracting with the aid of π-conduction-electron mediated interaction. Physisorption of watermolecules in micropores surrounding nano-graphite domains induces a reduction of the spinconcentration. This can be explained in terms of the enhancement of inter-nano-graphite interactioninduced by the effective pressure of introduced water molecules。
英文摘要
(1) Nano-graphite derived by the heat-treatment of nano-diamond is investigated in relation to their structures, electronic structures and host-guest systems with potassium and bromine. From Raman spectra and X-ray diffraction, it is found that nano-diamond is converted to nano-graphite around 1600℃. Nano-graphite thus obtained has a novel electronic structure featured with non-bonding π-electron states of edge origin. The non-bonding edge states play an important role in the spin-lattice relaxation mechanism as fast relaxation centers at the edges. The spin-lattice relaxation process is decelerated in less graphitized particles prepared at lower temperatures around 1200℃, which can be explained by the presence of remnant spィイD13ィエD1 regions. Intercalation of potassium makes edge states less important in the electronic structure due to charge transfer from potassium to graphite. The presence of potassium works to enhance the spin-orbit interaction.(2) The electronic properties of activated carbon fibers are investigated, which consist of disordered network of nano-graphite. Heat-treatment induces an insulator-to-metal transition around 1300℃, due to the development of infinite percolation path networks. In the insulating state, the charging effect works importantly in the electron hopping process, while the metallic state is featured with a considerable amount of disorder. In the vicinity of the insulator-to-metal transition, spin-glass-like disordered magnetism appears where spins of edge-inherited non-bonding states are interacting with the aid of π-conduction-electron mediated interaction. Physisorption of water molecules in micropores surrounding nano-graphite domains induces a reduction of the spin concentration. This can be explained in terms of the enhancement of inter-nano-graphite interaction induced by the effective pressure of introduced water molecules.
期刊论文(53)
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科研奖励(0)
会议论文
Toshiaki Enoki: "Nano-Graphite and its Intercelation Compounds"Proceedings of 4^<th> Biennial International Workshop in Russia, Fullerenes and Atomic Clusters, St. Petersburg. (1999)
Toshiaki Enoki:“纳米石墨及其插层化合物”俄罗斯第四届双年展国际研讨会论文集,富勒烯和原子团簇,圣彼得堡。
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odd.E.Andersson: "The c-anis Magnetoregistance and Thermoelectric Pwoer of Cu Cl_2 Graphite Intercalation Compounds" Mol.Cryst.Liq.Cryst. 310. 249-254 (1998)
odd.E.Andersson:“Cu Cl_2 石墨插层化合物的 c-anis 磁阻和热电功率”Mol.Cryst.Liq.Cryst。
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共 49 条
    Physical chemistry of nanographene edges:edge states and their electronic and magnetic functions
    • 批准号:
      20001006
    • 项目类别:
      Grant-in-Aid for Specially Promoted Research
    • 资助金额:
      $248.1万
    • 财政年份:
      2008
    • 负责人:
      ENOKI Toshiaki
    • 依托单位:
    Unconventional Electronic and Magnetic Properties of Carbon-Based Nano-π-electron System
    • 批准号:
      15105005
    • 项目类别:
      Grant-in-Aid for Scientific Research (S)
    • 资助金额:
      $72.3万
    • 财政年份:
      2003
    • 负责人:
      ENOKI Toshiaki
    • 依托单位:
    Unconventional Magnetism of Nanographite and Molecular Devices
    • 批准号:
      13440208
    • 项目类别:
      Grant-in-Aid for Scientific Research (B)
    • 资助金额:
      $9.41万
    • 财政年份:
      2001
    • 负责人:
      ENOKI Toshiaki
    • 依托单位:
    Development of Urtla-High Vacuum, Low Temperature, High Magnetic Field Scanning Tunneling Microscope.
    • 批准号:
      10354011
    • 项目类别:
      Grant-in-Aid for Scientific Research (A).
    • 资助金额:
      $22.72万
    • 财政年份:
      1998
    • 负责人:
      ENOKI Toshiaki
    • 依托单位:
    海外基金