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Journal Articles

Theoretical study of the adsorption of Cs, Cs$$^+$$, I, I$$^-$$, and CsI on C$$_{60}$$ fullerene

Kobayashi, Takanori; Yokoyama, Keiichi

Journal of Nuclear Science and Technology, 53(10), p.1489 - 1493, 2016/10

https://doi.org/10.1080/00223131.2015.1126206
 Times Cited Count：6 Percentile：49.29(Nuclear Science & Technology)

Theoretical investigation for the adsorption of the cesium atom (Cs), the cesium iodide molecule (CsI), the iodine atom (I), the cesium cation (Cs$$^+$$), and the iodide anion (I$$^-$$) onto the surface of a single fullerene molecule (C$$_{60}$$) are reported. A hybrid exchange-correlation functional using the Coulomb-attenuating method (CAM-B3LYP) is employed. The adsorption energies, i.e., the opposite of enthalpy change through adsorption, are calculated to be 34, 3, 2, 11, and 12 kcal mol$$^{-1}$$ for Cs, CsI, I, Cs$$^+$$, and I$$^-$$, respectively. The equilibrium constant for Cs is calculated to be 7$$times$$10$$^3$$ atm$$^{-1}$$ at the temperature of 1000 K and is seven orders of magnitude higher than that for CsI, indicating that the C$$_{60}$$ molecule adsorb the Cs atom highly selectively against the CsI molecule.

Journal Articles

Formation of fullerene(C$$_{60}$$) by laser ablation in superfluid helium at 1.5K

Aratono, Yasuyuki; Wada, Akira*; Akiyama, Kazuhiko; Kitazawa, Shinichi; Hojo, Kiichi; Naramoto, Hiroshi*

Chemical Physics Letters, 408(4-6), p.247 - 251, 2005/06

https://doi.org/10.1016/j.cplett.2005.04.053
 Times Cited Count：1 Percentile：3(Chemistry, Physical)

C$$_{60}$$ fulleren was detected in the deposit produced by the laser ablation in superfluid helium at 1.5K. From the mass spectrometry, it was found that the ratio, $$^{12}$$C$$_{60}$$/$$^{12}$$C$$_{59}$$$$^{13}$$C, differs from statistical one calculated by Poisson distribution for natural graphite. Assuming the recombination of atomic carbons to C$$_{2}$$ molecules as an initial stage for C$$_{60}$$ formation, the different isotopic ratio of C$$_{60}$$ from Poisson statistics was ascribed to the tunneling recombination between $$^{12}$$C and $$^{13}$$C atoms in the bubble state.

Journal Articles

Laser induced phase separation in the nickel-fullerene nano-composite

Vacik, J.*; Naramoto, Hiroshi; Kitazawa, Shinichi; Yamamoto, Shunya; Juha, L.*

Journal of Physics and Chemistry of Solids, 66(2-4), p.581 - 584, 2005/02

https://doi.org/10.1016/j.jpcs.2004.06.035
 Times Cited Count：6 Percentile：30.12(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Structure evolution and corresponding electrical properties in weakly bound Co-C60 mixture

Sakai, Seiji; Naramoto, Hiroshi; Xu, Y.; Priyanto, T. H.; Lavrentiev, V.; Narumi, Kazumasa

Materials Research Society Symposium Proceedings, Vol.788, p.L11.49.1 - L11.49.6, 2004/00

https://doi.org/10.1557/PROC-788-L11.49

Mixture films between cobalt and C$$_{60}$$ (CoxC$$_{60}$$, x = 0.5-700) were prepared by co-evaporation technique under UHV conditions. The composition-dependent features of dilatation and downshift of Raman peak suggest that the mixtures are composed of cobalt particles and a C$$_{60}$$-based phase in which certain number of cobalt atoms are coordinated with C$$_{60}$$ molecules. It is deduced that the equilibrated number of cobalt atoms in the C$$_{60}$$-based phase is 4 atoms per C$$_{60}$$ molecule and in which an electron transfer occurs from a cobalt atom to a C$$_{60}$$ molecule. The evaluation of their temperature dependences reveals that: (1) The mixtures with x $$leq$$ 4 are thermally activated-type, and their conductive nature can be attributed to the C$$_{60}$$-based phase. Further (2) the mixtures between 4 $$<$$ x $$<$$ 60 are also thermally activated, however, the electron hopping process between the isolated cobalt particles is supposed to be operative (variable-range-hopping). And (3) in the mixtures with x $$geq$$ 60 which corresponds to a percolation threshold for cobalt particles, the system changes into metallic conduction.

Journal Articles

Isolation of Co nanoparticles by C$$_{60}$$ molecules in co-deposited film

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

Materials Letters, 57(24-25), p.4093 - 4097, 2003/08

https://doi.org/10.1016/S0167-577X(03)00272-6
 Times Cited Count：9 Percentile：38(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

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

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 Eu$$_6$$C$$_{60}$$ and its Sr-substituted compounds, Eu$$_{6-x}$$Sr$$_x$$C$$_{60}$$. They have a $$bcc$$ structure, which is an isostructure of other $$M_6$$C$$_{60}$$ ($$M$$ represents an alkali atom or an alkaline earth atom). Magnetic measurements revealed that magnetic moment is ascribed to the divalent europium atom with $$S$$ = 7/2 spin, and a ferromagnetic transition was observed at $$T_C$$ = 10 - 14 K. In Eu$$_6$$C$$_{60}$$, we also confirm the ferromagnetic transition by heat capacity measurement. The striking feature in Eu$$_{6-x}$$Sr$$_x$$C$$_{60}$$ is very large negative magnetoresistance at low temperature; the resistivity ratio $$rho$$($$H$$ = 9 T)/$$rho$$($$H$$ = 0 T) reaches almost 10$$^{-3}$$ at 1 K in Eu$$_6$$C$$_{60}$$. Such large magnetoresistance is the manifestation of a strong $$pi$$-$$f$$ interaction between conduction carriers on C$$_{60}$$ and 4$$f$$ electrons of Eu.

JAEA Reports

Dynamic behaviors of fragments ejected from the surface of carbon materials by laser ablation

Yoda, Osamu; Miyashita, Atsumi; *; *

JAERI-M 92-173, 27 Pages, 1992/10

JAERI-M-92-173.pdf:1.22MB

no abstracts in English

Oral presentation

Sputtering of amorphous SiN induced by 540 keV C$$_{60}$$$$^{2+}$$ irradiation

Kitayama, Takumi*; Morita, Yosuke*; Nakajima, Kaoru*; Suzuki, Motofumi*; Narumi, Kazumasa; Saito, Yuichi; Matsuda, Makoto; Sataka, Masao*; Tsujimoto, Masahiko*; Isoda, Shoji*; et al.

no journal, , 

Oral presentation

Forward emission of secondary ions from phenylalanine films on SiN membranes penetrated by swift C$$_{60}$$$$^{+}$$ from the SiN side, 2

Nakajima, Kaoru*; Marumo, Tomoya*; Nagano, Kengo*; Kimura, Kenji*; Narumi, Kazumasa; Saito, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Sputtering of amorphous SiN irradiated with C$$_{60}$$ ions

Kitayama, Takumi*; Morita, Yosuke*; Nakajima, Kaoru*; Narumi, Kazumasa; Saito, Yuichi; Matsuda, Makoto; Sataka, Masao*; Kimura, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Sputtering of amorphous SiN films induced by 540-keV C$$_{60}$$ irradiation

Kitayama, Takumi*; Morita, Yosuke*; Nakajima, Kaoru*; Kimura, Kenji*; Narumi, Kazumasa; Saito, Yuichi; Matsuda, Makoto; Sataka, Masao*

no journal, , 

no abstracts in English

Oral presentation

Comparison of intensities of secondary ions emitted from thin organic polymer films induced by a C$$_{60}$$ ion and a single atom heavy ion irradiation

Hirata, Koichi*; Saito, Yuichi; Narumi, Kazumasa; Chiba, Atsuya; Yamada, Keisuke; Matoba, Shiro

no journal, , 

no abstracts in English

Oral presentation

Transmission secondary ions mass spectrometry of an amino acid using 5 MeV C$$_{60}$$ ions

Nakajima, Kaoru*; Nagano, Kengo*; Suzuki, Motofumi*; Narumi, Kazumasa; Saito, Yuichi; Hirata, Koichi*; Kimura, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Measurement of local temperature around the impact points of fast ions

Hayashi, Hiroaki*; Kitayama, Takumi*; Morita, Yosuke*; Nakajima, Kaoru*; Narumi, Kazumasa; Saito, Yuichi; Matsuda, Makoto; Sataka, Masao*; Tsujimoto, Masahiko*; Isoda, Shoji*; et al.

no journal, , 

no abstracts in English

Oral presentation

Forward emission of secondary ions from amino acids and peptides films on SiN membranes penetrated by swift C$$_{60}$$$$^{+}$$ from the backside

Marumo, Tomoya*; Nakajima, Kaoru*; Kimura, Kenji*; Narumi, Kazumasa; Saito, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Theoretical study of C$$_{60}$$ fullerene as the adsorbent of Cs

Kobayashi, Takanori; Yokoyama, Keiichi

no journal, , 

We have a plan for isotope separation of $$^{135}$$Cs using the difference of rotational constants of CsI. In the plan, the adsorbent which can adsorb Cs species-selectively is desirable for the recovery of $$^{135}$$Cs after isotope-selective dissociation process of CsI. Paying attention to the difference of the chemical nature of CsI and Cs, fullerenes would be expected to be desirable as the adsorptive material. To confirm the idea, we have calculated the adsorption energy of Cs, CsI etc. to C$$_{60}$$ fullerene using quantum chemistry calculation. We have also calculated the adsorption energy of a cluster model of illite, a kind of minerals which exists in soil and is known as a Cs$$^+$$ adsorbent. The results show that C$$_{60}$$ fullerene would be suitable to adsorb Cs atom in many CsI molecules. In the paper, we will discuss the thermochemical stability of the adducts.

Oral presentation

Depth concentration profile of cesium in fullerene absorbent studied by synchrotron X-ray photoelectron spectroscopy

Sekiguchi, Tetsuhiro; Yokoyama, Keiichi; Uozumi, Yuki*; Yano, Masahiro; Asaoka, Hidehito; Suzuki, Shinichi; Yaita, Tsuyoshi

no journal, , 

For nuclear transmutation of cesium-135 (Cs-135), which is long-lived fission product, we are developing selective absorbent which takes only Cs atom in, but does not CsI. In this study, absorbing property of Cs atom or CsI into fullerene (C$$_{60}$$) solid has been investigated using synchrotron-based angle-dependent X-ray photoelectron spectroscopy (ARXPS). It was found that Cs penetrates into C$$_{60}$$ deep bulk. In contrast, CsI does not diffuse into bulk, although CsI over-layer was formed on the shallow surface. Furthermore, XPS spectra were measured as a function of Ar$$^{+}$$-sputtering time in order to know Cs concentration profiles in further deep region. Results showed that Cs penetrates into deep region of several hundreds ${AA}$.

17 (Records 1-17 displayed on this page)
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