TY - JOUR
T1 - Magnetic properties of host-guest material using network of curved nanocarbon sheet
AU - Takai, Kazuyuki
AU - Suzuki, Tsuyoshi
AU - Nishihara, Hirotomo
AU - Kyotani, Takashi
AU - Enoki, Toshiaki
N1 - Funding Information:
The authors acknowledge support from Grant-in-Aid for Scientific Research No. 20001006 from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
PY - 2012/12
Y1 - 2012/12
N2 - The magnetic properties of host-guest systems composed of a nanoporous network of curved sp 2-nanocarbon sheets are investigated by using zeolite-templated carbon (ZTC) as a host material with focus on the effects of aging after synthesis, the presence of the template, and guest adsorption. There are two kinds of localized magnetic moments originating from a radical state at a curved part and an edge state at an edge part of the individual nanocarbon sheet. The ZTC sample just after synthesis shows an antiferromagnetic transition at 13 K, which disappears through aging process under ambient gas species such as oxygen. On the other hand, the template removing process during synthesis by using non-oxidizing reagent does not influence the magnetism of ZTC. The results of bromine adsorption reveal that a curved part responsible for the radical state in ZTC is destroyed through chemical reactions with the electron-accepting species. Potassium adsorbed into the nanopores in ZTC, forms magnetic clusters which undergo a ferromagnetic transition at 24 K. The ZTC spins well decoupled with the potassium spins act as a probe in observing the magnetic behavior of the guest potassium.
AB - The magnetic properties of host-guest systems composed of a nanoporous network of curved sp 2-nanocarbon sheets are investigated by using zeolite-templated carbon (ZTC) as a host material with focus on the effects of aging after synthesis, the presence of the template, and guest adsorption. There are two kinds of localized magnetic moments originating from a radical state at a curved part and an edge state at an edge part of the individual nanocarbon sheet. The ZTC sample just after synthesis shows an antiferromagnetic transition at 13 K, which disappears through aging process under ambient gas species such as oxygen. On the other hand, the template removing process during synthesis by using non-oxidizing reagent does not influence the magnetism of ZTC. The results of bromine adsorption reveal that a curved part responsible for the radical state in ZTC is destroyed through chemical reactions with the electron-accepting species. Potassium adsorbed into the nanopores in ZTC, forms magnetic clusters which undergo a ferromagnetic transition at 24 K. The ZTC spins well decoupled with the potassium spins act as a probe in observing the magnetic behavior of the guest potassium.
KW - A. Microporous materials
KW - A. Nanostructures
KW - B. Vapour deposition
KW - D. Magnetic properties
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U2 - 10.1016/j.jpcs.2012.02.032
DO - 10.1016/j.jpcs.2012.02.032
M3 - Article
AN - SCOPUS:84867577644
VL - 73
SP - 1436
EP - 1439
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 12
ER -