Magnetism of nano-graphite and its assembly

被引：22

作者：

Enoki, T ^{[1
]}

Kawatsu, N

Shibayama, Y

Sato, H

Kobori, R

Maruyama, S

Kaneko, K

机构：

[1] Tokyo Inst Technol, Dept Chem, Meguro Ku, Tokyo 1528551, Japan

[2] Chiba Univ, Dept Chem, Inage Ku, Chiba 2638522, Japan

来源：

POLYHEDRON | 2001年 / 20卷 / 11-14期

关键词：

nano-graphite; disordered magnetism; spin-glass; pi-electron system; edge-state; mesoscopic magnetism;

D O I：

10.1016/S0277-5387(01)00611-8

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We investigated the magnetism of activated carbon fibers with a three-dimensional disorder network of metallic nano-graphite domains, for which non-bonding pi -electron spins of edge origin are responsible. Spin-glass-like disordered magnetism appears in the vicinity of a heat-treatment-induced insulator-metal transition, due to the random strengths of the inter-nano-graphite antiferromagnetic interactions mediated by pi -conduction carriers. The magnetic moments of the localized spins show a steep drop at a threshold pressure in the adsorption isotherm of the water molecules in the micropores surrounding the nano-graphite domains. This is explained by the enhancement of the inter-graphene sheet exchange interaction by the effective pressure from the accommodated guest water molecules. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：1311 / 1315

页数：5

共 16 条

[1] Structure and electronic properties of graphite nanoparticles [J].

Andersson, OE ;

Prasad, BLV ;

Sato, H ;

Enoki, T ;

Hishiyama, Y ;

Kaburagi, Y ;

Yoshikawa, M ;

Bandow, S .

PHYSICAL REVIEW B, 1998, 58 (24) :16387-16395

[2]

[Anonymous], CARBON

[3] SPIN FLUCTUATIONS IN RANDOM MAGNETIC-NON-MAGNETIC TWO-DIMENSIONAL ANTI-FERROMAGNETS .2. HEISENBERG PERCOLATION [J].

BIRGENEAU, RJ ;

COWLEY, RA ;

SHIRANE, G ;

TARVIN, JA ;

GUGGENHEIM, HJ .

PHYSICAL REVIEW B, 1980, 21 (01) :317-332

[4] INTERCALATION COMPOUNDS OF GRAPHITE [J].

DRESSELHAUS, MS ;

DRESSELHAUS, G .

ADVANCES IN PHYSICS, 1981, 30 (02) :139-326

[5] NEW CHARACTERIZATION TECHNIQUES FOR ACTIVATED CARBON-FIBERS [J].

DRESSELHAUS, MS ;

FUNG, AWP ;

RAO, AM ;

DIVITTORIO, SL ;

KURIYAMA, K ;

DRESSELHAUS, G ;

ENDO, M .

CARBON, 1992, 30 (07) :1065-1073

[6] Peculiar localized state at zigzag graphite edge [J].

Fujita, M ;

Wakabayashi, K ;

Nakada, K ;

Kusakabe, K .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (07) :1920-1923

[7] COULOMB-GAP MAGNETOTRANSPORT IN GRANULAR AND POROUS CARBON STRUCTURES [J].

FUNG, AWP ;

WANG, ZH ;

DRESSELHAUS, MS ;

DRESSELHAUS, G ;

PEKALA, RW ;

ENDO, M .

PHYSICAL REVIEW B, 1994, 49 (24) :17325-17335

[8]

KAKEI K, 1992, CARBON, V130, P1075

[9] Cluster-mediated water adsorption on carbon nanopores [J].

Kaneko, K ;

Hanzawa, Y ;

Iiyama, T ;

Kanda, T ;

Suzuki, T .

ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY, 1999, 5 (01) :7-13

[10]

KANEKO K, 1991, CHARACTERIZATION POR, V2, P429

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