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Journal Articles

Electronic structure of Li $^{+}$ @C $_{60}$ ; Photoelectron spectroscopy of the Li $^{+}$ @C $_{60}$ [PF $_{6}$ $^{-}$ ] salt and STM of the single Li $^{+}$ @C $_{60}$ molecules on Cu(111)

Yamada, Yoichi*; Kuklin, A. V.*; Sato, Sho*; Esaka, Fumitaka; Sumi, Naoya*; Zhang, C.*; Sasaki, Masahiro*; Kwon, E.*; Kasama, Yasuhiko*; Avramov, P. V.*; et al.

Carbon, 133, p.23 - 30, 2018/07

https://doi.org/10.1016/j.carbon.2018.02.106

Times Cited Count：17 Percentile：55.14(Chemistry, Physical)

We report first STM observation of the Li $^{+}$ ion endohedral C $_{60}$ , which is of a new class of endohedral fullerenes, prepared by means of evaporation of high-purity Li $^{+}$ @C $_{60}$ [PF $_{6}$ $^{-}$ ] salt in ultra-high vacuum. Prior to the STM measurements, the electronic structure of Li $^{+}$ @C $_{60}$ in the Li $^{+}$ @C $_{60}$ [PF $_{6}$ $^{-}$ ] salt was also precisely determined. In the salt, it is shown that Li and PF $_{6}$ have nearly single positive and negative charge, respectively, and the C $_{60}$ cage is nearly neutral, suggesting that Li $^{+}$ @C $_{60}$ in the salt retains its original electronic state.

Journal Articles

Polymerization of C $_{60}$ thin films by ion irradiation

Narumi, Kazumasa; Sakai, Seiji; Naramoto, Hiroshi*; Takanashi, Koki

JAEA-Review 2005-001, TIARA Annual Report 2004, p.238 - 240, 2006/01

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2005-001-p0127-p0267.pdf

no abstracts in English

Journal Articles

Characterization of C $_{60}$ films polymerized by ion irradiation

Narumi, Kazumasa; Sakai, Seiji; Naramoto, Hiroshi*; Takanashi, Koki

Fullerenes, Nanotubes, and Carbon Nanostructures, 14(2-3), p.429 - 434, 2006/00

no abstracts in English

Journal Articles

Vortex phase diagram in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8+delta}$ with damage tracks created by 30 MeV fullerene irradiation

Ishikawa, Norito; Van der Beek, C. J.*; Dunlop, A.*; Jaskierowicz, G.*; Li, M.*; Kes, P. H.*; Della-Negra, S.*

Journal of the Physical Society of Japan, 73(10), p.2813 - 2821, 2004/10

https://doi.org/10.1143/JPSJ.73.2813

Times Cited Count：2 Percentile：19.85(Physics, Multidisciplinary)

By irradiating 30MeV C $_{60}$ fullerene beam, we have produced tracks of diameter 20nm and length 200nm near the surface of single crystalline Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8+delta}$ . Both the critical current density and magnetic irreversibility line are significantly enhanced. The irradiated crystals have shown salient features of the (,) vortex phase diagram of vortex matter both of unirradiated sample, such as the first order vortex phase transition, and the exponential Bose glass line characteristic of heavy ion-irradiated crystals.

Journal Articles

Preparation of fullerenes by resistive heating vaporization method; Effect of carbon materials

Otsuki, Ryusei*; Nasu, Shoichi*; Fujimori, Ryosuke*; Anada, Kinji*; Ohashi, Kentaro*; Yamamoto, Ryoichi*; Fujii, Kimio; Okubo, Keisuke*

Funtai Oyobi Fummatsu Yakin, 51(8), p.622 - 625, 2004/08

https://doi.org/10.2497/jjspm.51.622

Effects of carbon materials on weight yield of (C $_{60}$ +C $_{70}$ ) and weight ratios of C $_{60}$ to (C $_{60}$ +C $_{70}$ ) in soot were examined by the Joule resistive heating of four kinds of carbon materials at He gas pressures from 0.710 $^{4}$ 8.010 $^{4}$ Pa for collector radii of 45, 50 and 55mm. The yields were in the range of 1 to 8% for graphite with hexagonal lattice, and better than those for glassy carbon. The most effective He gas pressure for the fullerene yield were in the range of 4.05.310 $^{4}$ Pa. Any collector radii dependence of the yields was not observed. The weight ratios of C $_{60}$ to (C $_{60}$ +C $_{70}$ ) were about 60 to 70%, and showed neither He gas pressure depenndennce nor collector radii depenndence four kinds of carbon materials.

Journal Articles

Preparation of fullerenes by arc discharge between graphite anode and tungsten cathode; Effects of gas species

Otsuki, Ryusei*; Nasu, Shoichi*; Ohashi, Kentaro*; Yamamoto, Ryoichi*; Fujii, Kimio; Okubo, Keisuke*

Funtai Oyobi Fummatsu Yakin, 51(8), p.626 - 629, 2004/08

https://doi.org/10.2497/jjspm.51.626

The He, Ar and the Penning gas pressureeffects on the preparation yieldsof the fullerenes were investigated by means of the arc discharge method using graphite(PGX) anode buried in a tungsten rod and tungsten cathode for collector radii of 50mm. The maximum yield showed about 13-14 % at 67KPa in He gas. The yields in the mixtures of He and Ne gases (the Penning effect) were similar to those obtained in He gas. Weight ratios of C $_{60}$ to (C $_{60}$ +C $_{70}$ ) were about 20% in Ar gas, while those in He and Penning gas were about 60%. Ultra sonic vibration was effective to separate C $_{70}$ from soot.

Journal Articles

Preparation of fullerenes by arc discharge method; Effects of deposition temperature

Otsuki, Ryusei*; Nasu, Shoichi*; Matsushita, Masaki*; Fujii, Kimio; Ohashi, Kentaro*; Yamamoto, Ryoichi*

Funtai Oyobi Fummatsu Yakin, 51(8), p.633 - 634, 2004/08

https://doi.org/10.2497/jjspm.51.633

We examined effects of deposition temperatures and collector radii onthe yields of fullerenes by arc discharge. Yields of fullerenes were 7-10%, 4-6% and 0.5-1% in the liquid nitrogen-cooling, water-cooling, non-cooling, respectively, and were better with a collector radius of 50mm than with that of 30mm. The weight ratios of C $_{60}$ /C $_{70}$ are about one for all runs of experiments.

Journal Articles

Chemically driven microstructure evolution in cobalt-fullerene mixed system

Lavrentiev, V.; Naramoto, Hiroshi; Abe, Hiroaki*; Yamamoto, Shunya; Narumi, Kazumasa; Sakai, Seiji

Fullerenes, Nanotubes, and Carbon Nanostructures, 12(1-2), p.519 - 528, 2004/00

https://doi.org/10.1081/FST-120027216

Times Cited Count：3 Percentile：16.41(Chemistry, Physical)

no abstracts in English

Journal Articles

Formation of promising Co-C nanocompositions

Lavrentiev, V.; Abe, Hiroaki; Yamamoto, Shunya; Naramoto, Hiroshi; Narumi, Kazumasa

Surface and Interface Analysis, 35(1), p.36 - 39, 2003/01

https://doi.org/10.1002/sia.1489

Times Cited Count：8 Percentile：22.7(Chemistry, Physical)

no abstracts in English

Journal Articles

Formation of carbon nanotubes under conditions of Co+C $_{60}$ film

Lavrentiev, V.; Abe, Hiroaki; Yamamoto, Shunya; Naramoto, Hiroshi; Narumi, Kazumasa

Physica B; Condensed Matter, 323(1-4), p.303 - 305, 2002/10

https://doi.org/10.1016/S0921-4526(02)01031-1

Times Cited Count：15 Percentile：59.47(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Study of metallofullerenes encapsulating actinides

Akiyama, Kazuhiko; Sueki, Keisuke*; Tsukada, Kazuaki; Yaita, Tsuyoshi; Miyake, Yoko*; Haba, Hiromitsu*; Asai, Masato; Kodama, Takeshi*; Kikuchi, Koichi*; Otsuki, Tsutomu*; et al.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.151 - 154, 2002/06

https://doi.org/10.14494/jnrs2000.3.151

The oxidation state of actinide elements encapsulated in fullerenes is studied. HPLC elution behavior of actinide-fullerenes is classified into two groups; the elution behavior of the first group, encapsulating U, Np, and Am, is similar to that of the light lanthanide-fullerenes, such as La, Ce, Pr, and Nd, while the behavior of the second group, encapsulating Th and Pa, is quite different from that of any lanthanide-fullerenes. The chemical species in the main HPLC elution peak of each group were identified as M@C82 and M@C84 (M = metal atom) from the mass of the U and Th fullerenes, respectively. The oxidation states of the U and Th atoms in the fullerenes were deduced to be 3+ and 4+, respectively, from the UV/vis/NIR absorption and XANES spectroscopy.

Journal Articles

Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu $_{6-x}$ SrC $_{60}$

Ishii, Kenji; Fujiwara, Akihiko*; Suematsu, Hiroyoshi*; Kubozono, Yoshihiro*

Physical Review B, 65(13), p.134431_1 - 134431_6, 2002/03

https://doi.org/10.1103/PhysRevB.65.134431

Times Cited Count：32 Percentile：78.19(Materials Science, Multidisciplinary)

We have studied crystal structure, magnetism and electric transport properties of a europium fulleride EuC $_{60}$ and its Sr-substituted compounds, Eu $_{6-x}$ SrC $_{60}$ . They have a structure, which is an isostructure of other C $_{60}$ ( represents an alkali atom or an alkaline earth atom). Magnetic measurements revealed that magnetic moment is ascribed to the divalent europium atom with = 7/2 spin, and a ferromagnetic transition was observed at = 10 - 14 K. In EuC $_{60}$ , we also confirm the ferromagnetic transition by heat capacity measurement. The striking feature in Eu $_{6-x}$ SrC $_{60}$ is very large negative magnetoresistance at low temperature; the resistivity ratio ( = 9 T)/( = 0 T) reaches almost 10 $^{-3}$ at 1 K in EuC $_{60}$ . Such large magnetoresistance is the manifestation of a strong - interaction between conduction carriers on C $_{60}$ and 4 electrons of Eu.

Journal Articles

Mesoscopic patterning induced by co-deposition of C $_{60}$ and Ni on the MgO(100) single crystal

Vacik, J.; Naramoto, Hiroshi; Narumi, Kazumasa; Yamamoto, Shunya; Miyashita, Kiyoshi*

Materials Research Society Symposium Proceedings, Vol.648, p.P3.50.1 - P3.50.6, 2001/00

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Electronic structure of Li $^{+}$ @C $_{60}$ ; Photoelectron spectroscopy of the Li $^{+}$ @C $_{60}$ [PF $_{6}$ $^{-}$ ] salt and STM of the single Li $^{+}$ @C $_{60}$ molecules on Cu(111)

Polymerization of C $_{60}$ thin films by ion irradiation

Characterization of C $_{60}$ films polymerized by ion irradiation

Vortex phase diagram in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8+delta}$ with damage tracks created by 30 MeV fullerene irradiation

Preparation of fullerenes by resistive heating vaporization method; Effect of carbon materials

Preparation of fullerenes by arc discharge between graphite anode and tungsten cathode; Effects of gas species

Preparation of fullerenes by arc discharge method; Effects of deposition temperature

Chemically driven microstructure evolution in cobalt-fullerene mixed system

Formation of promising Co-C nanocompositions

Formation of carbon nanotubes under conditions of Co+C $_{60}$ film

Study of metallofullerenes encapsulating actinides

Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu $_{6-x}$ SrC $_{60}$

Mesoscopic patterning induced by co-deposition of C $_{60}$ and Ni on the MgO(100) single crystal