Novel Electronic Properties of a Nano-Graphite Disordered Network and Their Iodine Doping Effects : Condensed Matter: Electronic Properties, etc.
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概要
- 論文の詳細を見る
Activated carbon fibers (ACFs) are microporous carbons consisting of a three-dimensional disordered network of nano-graphites with a mean in-plane size of about 30 Å. We investigated the structure, electronic properties and iodine doping effects for ACF samples heat-treated up to 2800℃. The samples heat-treated below 1000℃ exhibit Coulomb gap variable-range hopping conduction and the presence of localized spins, suggesting the importance of charging effects and the edge-inherited non-bonding states in nano-graphites, the latter being predicted theoretically. Iodine doping reduces the charging effect due to the dielectric constant enhanced by the iodine that is accommodated in the micropores. Heat treatment above 1300℃ changes ACFs from an Anderson insulator to a disordered metal by the development of an infinite inter-nano-graphite percolation path network for electron transport, accompanied by a change from localized-spin magnetism to itinerant electron magnetism. In the metallic regime, carrier scattering is subjected to nano-graphite boundaries in terms of a short range random potential. Iodine-doping introduces ionized impurity scattering, which is caused by the I_3^- ions generated by the charge transfer from iodine to nano-graphite.
- 社団法人日本物理学会の論文
- 2000-03-15
著者
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榎 敏明
東工大理工
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SATO Hirohiko
Department of Chemistry,Graduate School of Science and Engineering,Tokyo Institute of Technology
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ENOKI Toshiaki
Department of Chemistry,Graduate School of Science and Engineering,Tokyo Institute of Technology
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Sakata‐haga H
関西医科大学 神経内科学
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Sakata-haga Hiromi
徳島大学 ヘルスバイオサイエンス研究部機能解剖学
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Sakata-haga Hiromi
Department Of Anatomy And Developmental Neurobiology Institute Of Health Biosciences The University
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Sakata-haga Hiromi
Department Of Anatomy University Of Tokushima School Of Medicine
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Sakata Haga
Department Of Anatomy And Developmental Neurobiology University Of Tokushima School Of Medicine
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Haga H
Univ. Tokushima School Of Medicine Tokushima Jpn
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Endo Morinobu
Department Of Electrical And Electronic Engineering Faculty Of Engineering Shinshu University
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Endo Morinobu
Department Of Electrical Engineering Shinshu University
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Hirohiko Sato
Department Of Chemistry Tokyo Institute Of Technology
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Dresselhaus M
Massachusetts Inst. Technol. Ma Usa
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Dresselhaus Mildred
Department Of Physics Massachusetts Institute Of Technology:departinent Of Electrical Engineering An
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Hashimoto S
Graduate School Of Science Osaka University
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SHIBAYAMA Yoshiyuki
Department of Chemistry, Tokyo Institute of Technology
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BI Xiang-Xin
Department of Physics, Massachusetts Institute of Technology
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Sato Hiroshi
Research Center For Radiation Safety National Institute Of Radiological Sciences
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Bi Xiang-xin
Department Of Physics Massachusetts Institute Of Technology
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Hisano Setsuji
Dept. Anat. Sch. Med. Tokushima Univ.
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Enoki Toshiaki
Department Of Chemistory Tokyo Inst.of Technology
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Sato Hirohiko
Department Of Chemistry Faculty Of Science Kyoto University
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Sato Hiroshi
Department Of Anatomy And Developmental Neurobiology Institute Of Health Biosciences The University
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Shibayama Yoshiyuki
Department Of Chemistry Tokyo Institute Of Technology
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Sato Hirohiko
Department Of Biotechnology Tokyo University Of Agriculture And Technology
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Sakata Haga
Department Of Anatomy And Developmental Neurobiology Institute Of Health Biosciences University Of Tokushima Graduate School
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SHIBAYAMA Yoshiyuki/SATO
Department of Chemistry, Tokyo Institute of Technology/Department of Chemistry, Tokyo Institute of Technology/Department of Chemistry, Tokyo Institute of Technology/Department of Physics, Massachusetts Institute of Technology/Department of Physics, Massac
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Sato Hirohiko
Masssachusetts 02139, U.S.A.
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Enoki Toshiaki
Masssachusetts 02139, U.S.A.
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