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Fukutani, Katsuyuki; Ozawa, Takahiro*; 4 of others*
Journal of Vacuum Science and Technology A, 42(2), p.023402_1 - 023402_6, 2024/03
Zhou, X.*; Fukutani, Katsuyuki; 9 of others*
Applied Physics Letters, 124(8), p.082103_1 - 082103_7, 2024/02
Mao, W.*; Fukutani, Katsuyuki; 8 of others*
International Journal of Hydrogen Energy, 50(Part D), p.969 - 978, 2024/01
Koshida, Hiroyuki*; Wilde, M.*; Fukutani, Katsuyuki
Journal of Chemical Physics, 160(3), p.034703_1 - 034703_9, 2024/01
Suzuki, Seiya; Katsube, Daiki*; Yano, Masahiro; Tsuda, Yasutaka; Terasawa, Tomoo; Ozawa, Takahiro*; Fukutani, Katsuyuki; Kim, Y.*; Asaoka, Hidehito; Yuhara, Junji*; et al.
Small Methods, p.2400863_1 - 2400863_9, 2024/00
Times Cited Count：0 Percentile：0.00(Chemistry, Physical)Yasuda, Satoshi; Di
o, W. A.*; Fukutani, Katsuyuki
Vacuum and Surface Science, 66(9), p.514 - 519, 2023/09
Monolayer graphene, representative of atomically thin crystals, has recently shown unexpectedly high proton and deuteron permeability under ambient conditions. It also permeates (filters) hydrogen (deuterium) isotope ion with high selectivity. These results suggest possible ways of developing novel and efficient hydrogen isotope gas enrichment techniques for manufacturing silicon semiconductors, optical fibers, drug development, nuclear fusion, and other related applications. And yet, despite its importance, experimental studies remain scarce and the separation mechanism contentious. Here, we introduce our recent findings on how quantum tunneling of hydrons through graphene could account for the high hydron selectivity of graphene.
Ueta, Hirokazu; Fukutani, Katsuyuki*; Yamakawa, Koichiro
Frontiers in Chemistry (Internet), 11, p.1258035_1 - 1258035_7, 2023/08
Times Cited Count：0 Percentile：0.00(Chemistry, Multidisciplinary)Molecular hydrogen has two nuclear-spin modifications called 
and 
. Because of the symmetry restriction with respect to permutation of the two protons, the and isomers take only odd and even values of the rotational quantum number, respectively. The -to- conversion is promoted in condensed systems, to which the excess rotational energy and spin angular momentum are transferred. We review recent studies on fast -to- conversion of hydrogen in molecular chemisorption and matrix isolation systems, discussing the conversion mechanism as well as rotational-relaxation pathways.
ortho-para conversion on a metal surface; Interplay between electron and phonon systemsUeta, Hirokazu; Fukutani, Katsuyuki
Journal of Physical Chemistry Letters (Internet), 14(34), p.7591 - 7596, 2023/08
Times Cited Count：1 Percentile：19.67(Chemistry, Physical)Yano, Masahiro; Yasuda, Satoshi; Fukutani, Katsuyuki; Asaoka, Hidehito
RSC Advances (Internet), 13(21), p.14089 - 14096, 2023/05
Times Cited Count：1 Percentile：17.05(Chemistry, Multidisciplinary)Bottom-up synthesis on metal surfaces has attracted attention for the fabrication of graphene nanoribbons (GNRs) with atomically-precise chemical structures to realize novel electronic devices. However, control of length and orientation on surfaces during GNR synthesis is difficult, thus, achieving longer and aligned GNR growth is a significant challenge. Herein, we report GNR synthesis from a well-ordered dense monolayer on Au crystalline surfaces for long and oriented GNR growth. Scanning tunneling microscopy showed that 10,10'-dibromo-9,9'-bianthracene (DBBA) precursors deposited on Au(111) at room temperature self-assembled into a well-ordered dense monolayer, and the straight molecular wire structure was formed where Br atoms in each precursor were adjacent along the wire axis. The DBBAs in the monolayer were found to be hardly desorbed from the surface under subsequent heating and efficiently polymerize along with the molecular arrangement, resulting in more long and oriented GNR growth compared to the conventional growth method. The result is attributed to be suppression of random diffusion and desorption of the DBBAs on the Au surface during polymerization due to the densely-packed DBBA structure. Additionally, an investigation of the effect of the Au crystalline plane on the GNR growth revealed further anisotropic GNR growth on Au(100) compared to Au(111) due to the stronger interactions of DBBA with Au(100). These findings provide fundamental knowledge for controlling GNR growth from a well-ordered precursor monolayer to achieve more long and oriented GNRs.
NH and CaNH thin films by reactive magnetron sputtering under hydrogen partial pressure controlChon, S.*; Fukutani, Katsuyuki; 8 of others*
Journal of Physical Chemistry Letters (Internet), 13(43), p.10169 - 10174, 2022/11
Times Cited Count：0 Percentile：0.00(Chemistry, Physical)
O
(111) surfacesAsakawa, Kanta*; Fukutani, Katsuyuki; Kawauchi, Taizo*
Journal of Physics Communications (Internet), 6(10), p.105004_1 - 105004_6, 2022/10
Yasuda, Satoshi; Matsushima, Hisayoshi*; Harada, Kenji*; Tanii, Risako*; Terasawa, Tomoo; Yano, Masahiro; Asaoka, Hidehito; Gueriba, J. S.*; Dio, W. A.*; Fukutani, Katsuyuki
ACS Nano, 16(9), p.14362 - 14369, 2022/09
Times Cited Count：18 Percentile：82.45(Chemistry, Multidisciplinary)The fabrication of hydrogen isotope enrichment system is essential for the development of industrial, medical, life science, and nuclear fusion fields, therefore alternative enrichment techniques with high separation factor and economic feasibility have been still explored. Herein, we report the fabrication of heterogeneous electrode with layered structures consisting of palladium and graphene layers for polymer electrolyte membrane electrochemical hydrogen pumping for the hydrogen isotope enrichment. We demonstrated significant bias voltage dependence of hydrogen/deuterium (H/D) separation ability and its high H/D at lower bias voltage. Theoretical analysis also demonstrated that the observed high H/D at low bias voltage stems from hydrogen isotopes tunneling through atomically-thick graphene during the electrochemical reaction, and the bias dependent H/D results in a transition from the quantum tunneling regime to classical over- barrier regime for hydrogen isotopes transfer via the graphene. These findings provide new insight for a novel economical methodology of efficient hydrogen isotope enrichment.
Kawamura, Takaaki*; Fukaya, Yuki; Fukutani, Katsuyuki
Surface Science, 722, p.122098_1 - 122098_8, 2022/08
Times Cited Count：1 Percentile：8.43(Chemistry, Physical)no abstracts in English
Terasawa, Tomoo; Fukutani, Katsuyuki; Yasuda, Satoshi; Asaoka, Hidehito
e-Journal of Surface Science and Nanotechnology (Internet), 20(4), p.196 - 201, 2022/07
Graphene is a perfect impermeable membrane for gases but permeable to hydrogen ions. Hydrogen ion permeation shows the isotope effect, i.e., deuteron is slower than proton when permeating graphene. However, the permeation mechanism and the origin of the isotope effect are still unclear. Here, we propose a strategy to discuss the hydrogen ion permeation mechanism of graphene by developing an ion source with ultraslow, monochromatic, and mass-selected hydrogen ion beam. We employed a hemispherical monochromator and a Wien filter for the ion source to achieve the energy and mass resolutions of 0.39 eV and 1 atomic mass unit, respectively. The energetically sharp ion beam is expected to allow us to directly measure the permeability of graphene with high accuracy.
Fukutani, Katsuyuki; Yoshinobu, Jun*; Yamauchi, Miho*; Shima, T.*; Orimo, Shinichi*
Catalysis Letters, 152, p.1583 - 1597, 2022/06
Times Cited Count：11 Percentile：45.85(Chemistry, Physical)Komatsu, Yuya*; Shimizu, Ryota*; Sato, Ryuhei*; Wilde, M.*; Nishio, Kazunori*; Katase, Takayoshi*; Matsumura, Daiju; Saito, Hiroyuki*; Miyauchi, Masahiro*; Adelman, J. R.*; et al.
Chemistry of Materials, 34(8), p.3616 - 3623, 2022/04
Times Cited Count：15 Percentile：76.60(Chemistry, Physical)(101) surfaceNagatsuka, Naoki*; Fukutani, Katsuyuki; 2 of others*
Physical Review B, 105(4), p.045424_1 - 045424_6, 2022/01
Times Cited Count：4 Percentile：40.97(Materials Science, Multidisciplinary)
-X-ray photoelectron spectroscopySuehara, Michinori*; Yamamoto, Yuichi*; Ogura, Shohei*; Fukutani, Katsuyuki
Journal of Non-Crystalline Solids, 574, p.121160_1 - 121160_4, 2021/12
Times Cited Count：0 Percentile：0.00(Materials Science, Ceramics)Nagaya, Yuki*; Nakatsu, Hiroki*; Ogura, Shohei*; Shimazaki, Kota*; Ueta, Hirokazu; Takeyasu, Kotaro*; Fukutani, Katsuyuki
Journal of Chemical Physics, 155(19), p.194201_1 - 194201_6, 2021/11
Times Cited Count：1 Percentile：4.90(Chemistry, Physical) on Pd(210)Ueta, Hirokazu; Fukutani, Katsuyuki
Vacuum and Surface Science, 64(9), p.430 - 434, 2021/09
