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1999 Fiscal Year Final Research Report Summary

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

Research Project

Project/Area Number 08404048
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 機能・物性・材料
Research InstitutionTokyo Institute of Technology

Principal Investigator

ENOKI Toshiaki  Graduate Scholl of Decision Science, TOKYO INSTITUTE OF TECHNOLOGY, Professor, 大学院・理工学研究科, 教授 (10113424)

Co-Investigator(Kenkyū-buntansha) MIYAZAKI Akira  Graduate Scholl of Decision Science, TOKYO INSTITUTE OF TECHNOLOGY, Assistant, 大学院・理工学研究科, 助手 (40251607)
SATO Hirohiko  Graduate Scholl of Decision Science, TOKYO INSTITUTE OF TECHNOLOGY, Assistant, 大学院・理工学研究科, 助手 (90262261)
Project Period (FY) 1996 – 1999
KeywordsNano-Graphite / Intercalation Compounds / Activated Carbon Fiber / Micropore / Spin Glass
Research Abstract

(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.

  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] I. Matthews: "Localized Spins in Partially Carbonized Polyparaphenylene"Phys. Rev.. B60. 4749-4757 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshiaki Enoki: "Electronic and Magnetic Properties of Nano-Graphite"Proceedings of Applied Diamond Conference/Frontier Carbon Technology Joint Conference, Tsukuba. 213-218 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshiaki Enoki: "Host-Guest Systems in Microporous Carbons"Materials Research Society Proceedings, "Solid State Ionics". 1 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshiyuki Shibayama: "Disordered Magnetism at the Metal-Insulator Threshold in Nano-Graphite-Based Carbon Material"Phys. Rev. Letters. 84・8. 1744-1747 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirohiko Sato: "Dimensional Crossover and Angular Dependent Magnetoresistance of Magnetic Graphite Intercalation Compounds; MC1_2 GIC'_s(M=Cu and Co)"J. Phys. Soc. Jpn.. 69(In press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshiyuki Shibayama: "Novel Electronic Properties of a Nano-Graphite Disordered Network and Their Iodine Doping Effects"J. Phys. Soc. Jpn.. 69(In press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] B. L. V. Prasad: "Nano-Graphites and Their Potassium Intercalated Compounds : Structural and Electronic Properties"Mol. Cryst. Liq. cryst. (In press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirohiko Sato: "Anomalous Angular Dependence of Magnetoresistance in MCI_2-GIC's(M=Cu and Co)"Mol. Cryst. Liq. cryst. (In press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshiyuki Shibayama: "^<129>I Mossbauer Effect of Iodine Adsorbed in Activated Carbon Fibers"Mol. Cryst. Liq. cryst. (In press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itsuko S. Suzuki: "Successive Magnetic Phase Transitions of Cu_cCo_<1-c>CI_2-FeCI_3 Graphite Intercalation Compounds"Mol. Cryst. Liq. Cryst. (In press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuyuki Takai: "Fluorine-Introduced sp^3-Carbon Sites in a Nano-Sized p-Electron System and Their Effects on the Electronic Properties"Mol. Cryst. Liq. Cryst. (In press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshiaki Enoki: "Nano-Graphite and its Intercelation Compounds"Proceedings of 4^<th> Biennial International Workshop in Russia, Fullerenes and Atomic Clusters, St. Petersburg. (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] I. Matthews: "Located Spins in Partially Carbonized, Polyparaphenylene"Phys. Rev.. B60. 4749-4757 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshiaki Enoki: "Electronic and Magnetic Properties of Nano-Graphite"Proceedings of Applied Diamond Conference/Frontier Carbon Technology Joint Conference, Tsukuba. 213-218 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshiaki Enoki: "Host-Guest Systems in Microporous Carbons"Materials Research Society Proceedings, "Solid State Ionics". 1 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiyuki Shibayama: "Disordered Magnetism at the Metal-Insulator Threshold in Nano-Graphite-Based Carbon Material"Phys. Rev. Letters. 84-8. 1744-1747 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirohiko Sato: "Dimensional Crossover and Angular Dependent Magnetoresistance of mMagnetic Graphite Intercalation Compounds ; MC1ィイD22ィエD2GIC's (M=Cu and Co)"J. Phys. Soc. Jpn.. 69(in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiyuki Shibayama: "Novel Electronic Properties of a Nano-Graphite Disordered Network and Their Iodine Doping Effects"J. Phys. Soc. Jpn.. 69(in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] B. L. V. Prasad: "Nano-Graphites and Their Potassium Intercalated Compounds : Structural and electronic Properties"Mol. Cryst. Liq. Cryst.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirohiko Sato: "Anomalous Angular Dependence of Magnetoresistance in MC1ィイD22ィエD2GIC's (M=Cu and Co)"Mol. Cryst. Liq. Cryst.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiyuki Shibayama: "ィイD1129IィエD1 Mossbauer Effect of Iodine Adsorbed in Activated Carbon Fibers"Mol. Cryst. Liq. Cryst.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Itsuko S. Suzuki: "Successive Magnetic Phase Transitions of CuィイD2cィエD2CoィイD21-cィエD2ClィイD22ィエD2-FeClィイD23ィエD2 Graphite Intercalation Compounds"Mol. Cryst. Liq. Cryst.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kazuyuki Takai: "Fluorine-Introduced sp-ィイD13ィエD1-Carbon Sites in a Nano-Sized p-Electron System and their Effects on the Electronic Properties"Mol. Cryst. Liq. Cryst.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshiaki Enoki: "Nano-Graphite and its Intercalation Compounds"Mol. Cryst. Liq. Cryst.. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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