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Eddy DR, Nur Sheha GA, Permana MD, Saito N, Takei T, Kumada N, Irkham, Rahayu I, Abe I, Sekine Y, Oyumi T, Izumi Y. Study on triphase of polymorphs TiO 2 (anatase/rutile/brookite) for boosting photocatalytic activity of metformin degradation. Chemosphere 2024; 351:141206. [PMID: 38219987 DOI: 10.1016/j.chemosphere.2024.141206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 01/16/2024]
Abstract
The elution of pharmaceutical products such as metformin at higher concentrations than the safe level in aquatic systems is a serious threat to human health and the ecosystem. Photocatalytic technology using TiO2 semiconductors potentially fixes this problem. This study aims to synthesize triphasic anatase-rutile-brookite TiO2 using ultrasound assisted sol-gel technique in the presence of acid and its application to photodegradation of metformin under UV light irradiation. Based on X-ray diffraction analysis, a TiO2 sample consisted of anatase (76%), rutile (7%), and brookite (17%) polymorph (A76R7B17) that was fully crystallized. Scanning electron microscopy (EM)-energy dispersive X-ray spectra results showed agglomerated triphasic A76R7B17 with irregular spherical clusters. Transmission EM results revealed that the crystal size of A76R7B17 was 4-14 nm. The Brunauer-Emmett-Teller analysis showed the sample's specific surface area of 149 m2 g-1. The degradation test of metformin demonstrated that the A76R7B17 exhibited a 75.4% degradation efficiency after 120 min under UV light irradiation, significantly higher than using biphasic and single-phase TiO2 photocatalysts. This difference could be attributed to the heterojunction effect of triphasic materials that effectively reduced electron-hole recombination rate as well as the combination of effective electron transfer from conduction band of brookite and anatase and the utilization of wider range of UV-visible light using rutile.
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Affiliation(s)
- Diana Rakhmawaty Eddy
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia.
| | - Geometry Amal Nur Sheha
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia
| | - Muhamad Diki Permana
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia; Special Educational Program for Green Energy Conversion Science and Technology, Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of Yamanashi, Kofu, 400-8511, Japan; Center for Crystal Science and Technology, University of Yamanashi, Kofu, 400-8511, Japan
| | - Norio Saito
- Center for Crystal Science and Technology, University of Yamanashi, Kofu, 400-8511, Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, Kofu, 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, Kofu, 400-8511, Japan
| | - Irkham
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia
| | - Iman Rahayu
- Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang, 45363, Indonesia
| | - Ikki Abe
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
| | - Yuta Sekine
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
| | - Tomoki Oyumi
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
| | - Yasuo Izumi
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
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Eddy DR, Permana MD, Sakti LK, Sheha GAN, Solihudin, Hidayat S, Takei T, Kumada N, Rahayu I. Heterophase Polymorph of TiO 2 (Anatase, Rutile, Brookite, TiO 2 (B)) for Efficient Photocatalyst: Fabrication and Activity. Nanomaterials (Basel) 2023; 13:704. [PMID: 36839072 PMCID: PMC9965282 DOI: 10.3390/nano13040704] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/07/2023] [Accepted: 02/08/2023] [Indexed: 07/30/2023]
Abstract
TiO2 exists naturally in three crystalline forms: Anatase, rutile, brookite, and TiO2 (B). These polymorphs exhibit different properties and consequently different photocatalytic performances. This paper aims to clarify the differences between titanium dioxide polymorphs, and the differences in homophase, biphase, and triphase properties in various photocatalytic applications. However, homophase TiO2 has various disadvantages such as high recombination rates and low adsorption capacity. Meanwhile, TiO2 heterophase can effectively stimulate electron transfer from one phase to another causing superior photocatalytic performance. Various studies have reported the biphase of polymorph TiO2 such as anatase/rutile, anatase/brookite, rutile/brookite, and anatase/TiO2 (B). In addition, this paper also presents the triphase of the TiO2 polymorph. This review is mainly focused on information regarding the heterophase of the TiO2 polymorph, fabrication of heterophase synthesis, and its application as a photocatalyst.
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Affiliation(s)
- Diana Rakhmawaty Eddy
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Muhamad Diki Permana
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
- Integrated Graduate School of Medicine, Engineering, and Agricultural Sciences, University of Yamanashi, Kofu 400-8511, Japan
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Lintang Kumoro Sakti
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Geometry Amal Nur Sheha
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Solihudin
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Sahrul Hidayat
- Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Iman Rahayu
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Sumedang 45363, West Java, Indonesia
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Jo M, Lee JYM, Assouline A, Brasseur P, Watanabe K, Taniguchi T, Roche P, Glattli DC, Kumada N, Parmentier FD, Sim HS, Roulleau P. Scaling behavior of electron decoherence in a graphene Mach-Zehnder interferometer. Nat Commun 2022; 13:5473. [PMID: 36115841 PMCID: PMC9482640 DOI: 10.1038/s41467-022-33078-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 08/30/2022] [Indexed: 11/09/2022] Open
Abstract
AbstractOver the past 20 years, many efforts have been made to understand and control decoherence in 2D electron systems. In particular, several types of electronic interferometers have been considered in GaAs heterostructures, in order to protect the interfering electrons from decoherence. Nevertheless, it is now understood that several intrinsic decoherence sources fundamentally limit more advanced quantum manipulations. Here, we show that graphene offers a unique possibility to reach a regime where the decoherence is frozen and to study unexplored regimes of electron interferometry. We probe the decoherence of electron channels in a graphene quantum Hall PN junction, forming a Mach-Zehnder interferometer1,2, and unveil a scaling behavior of decay of the interference visibility with the temperature scaled by the interferometer length. It exhibits a remarkable crossover from an exponential decay at higher temperature to an algebraic decay at lower temperature where almost no decoherence occurs, a regime previously unobserved in GaAs interferometers.
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Yanagida S, Yajima T, Takei T, Kumada N. Removal of hexavalent chromium from water by Z-scheme photocatalysis using TiO 2 (rutile) nanorods loaded with Au core-Cu 2O shell particles. J Environ Sci (China) 2022; 115:173-189. [PMID: 34969447 DOI: 10.1016/j.jes.2021.05.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 04/27/2021] [Accepted: 05/17/2021] [Indexed: 06/14/2023]
Abstract
All-solid-state Z-scheme photocatalysts, containing Cu2O, TiO2 (rutile), and Au as the electron mediator, were prepared and applied to the reduction of Cr(VI) in aqueous solutions. The Cu2O-Au-TiO2 composites were prepared by loading Au core-Cu2O shell hemisphere particles on TiO2 (rutile) nanorods using a two-step photocatalytic deposition process. Under ultraviolet-visible (UV-vis) light illumination, the Cu2O-Au-TiO2 composites exhibited higher photocatalytic Cr(VI) reduction activities than those exhibited by single TiO2 (rutile) and Cu2O. In this reaction, a precipitate containing Cr, which was considered to be Cr(OH)3, was deposited site-selectively on the Au core-Cu2O shell particles of the composites, indicating that the reduction site of the composite was Cu2O, and the reaction proceeded according to the Z-scheme. The Cu2O-Au-TiO2 composites also exhibited photocatalytic activity under visible light illumination. The oxidation state of Cu in the Cu2O-Au-TiO2 composite gradually changed from Cu(I) to Cu(II) during the photocatalytic Cr(VI) reduction. However the composite maintained its high photocatalytic performance even after oxidation. The role of Au in the Cu2O-Au-TiO2 composite was examined by comparing the properties of the Cu2O-Au-TiO2 composite with those of the Cu2O-TiO2 composite prepared via direct Cu2O deposition on TiO2.
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Affiliation(s)
- Sayaka Yanagida
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan; Advanced Materials Development Sector, Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10, Aomi, Koto-ku, Tokyo 135-0064, Japan.
| | - Takumi Yajima
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, Kofu 400-8511, Japan
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Hossain KM, Saiduzzaman M, Kumada N, Takei T, Yamane H. Hydrothermal synthesis and crystal structure of a novel double-perovskite-type bismuth oxide with 3:1 ordering at the B-site. NEW J CHEM 2022. [DOI: 10.1039/d1nj05648d] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A low-temperature hydrothermal method was successfully used to synthesize a novel bismuth oxide Ba4Bi3NaO12. Here, NaBiO3·nH2O was used as one of the starting materials. Single-crystal X-ray diffraction revealed the triclinic...
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Permana MD, Noviyanti AR, Lestari PR, Kumada N, Eddy DR, Rahayu I. Synthesis and Photocatalytic Activity of TiO2 on Phenol Degradation. KJS publishes peer-review articles in Mathematics, Computer Science, Physics, Statistics, Biology, Chemistry, and Earth & Environmental Sciences 2021. [DOI: 10.48129/kjs.13509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Photocatalysis is a process of accelerating reactions that are assisted by energy from light irradiation. Titanium dioxide (TiO2) is one of the most widely developed photocatalysis materials, and is used because of its high catalytic activity, stability and very affordable. The most commonly used precursors of TiO2 are titanium butoxide (TBOT) and titanium tetraisopropoxide (TTIP). These variations in precursor can lead to phase difference in the formation of TiO2 crystals, which further improves its nature in the activity of photocatalysis. In this study, the sol-gel method was used to synthesize titanium dioxide nanoparticles from variations of TBOT and TTIP. Furthermore, the structure, crystallite size and band gap of TiO2 were determined by X-ray diffraction (XRD) and UV-vis reflectance spectroscopy (DRS). Subsequently, TiO2 photocatalytic activity was evaluated in phenol photodegradation as a contaminant model with UV irradiation. The results showed the structure synthesized from TBOT had a higher amount of anatase, higher crystallinity, smaller crystallite size, larger band gap, and better photocatalytic activity than those from TTIP. Furthermore, it was shown that TiO2 from TBOT had an efficiency of 147% greater than TiO2 P25 Degussa, while TiO2 from TTIP had 66% efficiency compared to TiO2 P25.
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Hossain K, Saiduzzaman M, Kumada N, Takei T, Yamane H, Kabir Rubel MH. Hydrothermal Synthesis and Crystal Structure of a Novel Bismuth Oxide: (K 0.2Sr 0.8)(Na 0.01Ca 0.25Bi 0.74)O 3. ACS Omega 2021; 6:15975-15980. [PMID: 34179642 PMCID: PMC8223429 DOI: 10.1021/acsomega.1c01694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 05/31/2021] [Indexed: 05/03/2023]
Abstract
A novel distorted perovskite-type (K0.2Sr0.8)(Na0.01Ca0.25Bi0.74)O3 was prepared by a hydrothermal method using the starting materials NaBiO3·nH2O, Sr(OH)2·8H2O, Ca(OH)2, and KOH. Single-crystal X-ray diffraction of the novel compound revealed a GdFeO3-related structure belonging to the monoclinic system of the space group Cc with the following cell parameters: a = 11.8927 (17) Å, b = 11.8962 (15) Å, c = 8.4002 (10) Å, and β = 90.116 (9)°. The final R-factors were obtained as R 1 = 0.0354 and wR 2 = 0.0880 (using all the data). K+ and Sr2+ ions were distributed at four types of A-sites. On the other hand, four Bi5+-sites (Bi1, Bi2, Bi3, and Bi4) were occupied by four Ca2+ ions (Ca1, Ca2, Ca3, and Ca4), and the first three B-sites were occupied predominantly by Bi5+ with Na+ ions. The forth B-site was occupied predominantly by the Ca2+ ion with Bi5+ ions. Two types of B-sites, thus forming tilted distorted (Na/Ca/Bi)O6 and (Bi/Ca)O6 octahedra, have an ordering of 3:1 represented as (K/Sr)4(Na/Ca/Bi)3(Bi/Ca)O12. The distorted (Na/Ca/Bi)O6 and (Ca/Bi)O6 octahedra formed a perovskite-type network by corner sharing with features closely matching those of a GdFeO3-type structure. The novel compound is the first example of a perovskite-type bismuth oxide containing only Bi5+ in a system without a Ba atom and has a unique ordering (3:1) of the B site. The compound showed photocatalytic activity for phenol degradation under visible light irradiation.
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Affiliation(s)
- Khandaker
Monower Hossain
- Center
for Crystal Science and Technology, University
of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Md Saiduzzaman
- Department
of Materials Science and Engineering, Khulna
University of Engineering & Technology, Khulna 9203, Bangladesh
| | - Nobuhiro Kumada
- Center
for Crystal Science and Technology, University
of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Takahiro Takei
- Center
for Crystal Science and Technology, University
of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Hisanori Yamane
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Mirza Humaun Kabir Rubel
- Department
of Materials Science and Engineering, University
of Rajshahi, Rajshahi 6205, Bangladesh
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Jo M, Brasseur P, Assouline A, Fleury G, Sim HS, Watanabe K, Taniguchi T, Dumnernpanich W, Roche P, Glattli DC, Kumada N, Parmentier FD, Roulleau P. Quantum Hall Valley Splitters and a Tunable Mach-Zehnder Interferometer in Graphene. Phys Rev Lett 2021; 126:146803. [PMID: 33891444 DOI: 10.1103/physrevlett.126.146803] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 02/18/2021] [Indexed: 06/12/2023]
Abstract
Graphene is a very promising test bed for the field of electron quantum optics. However, a fully tunable and coherent electronic beam splitter is still missing. We report the demonstration of electronic beam splitters in graphene that couple quantum Hall edge channels having opposite valley polarizations. The electronic transmission of our beam splitters can be tuned from zero to near unity. By independently setting the beam splitters at the two corners of a graphene p-n junction to intermediate transmissions, we realize a fully tunable electronic Mach-Zehnder interferometer. This tunability allows us to unambiguously identify the quantum interferences due to the Mach-Zehnder interferometer, and to study their dependence with the beam-splitter transmission and the interferometer bias voltage. The comparison with conventional semiconductor interferometers points toward universal processes driving the quantum decoherence in those two different 2D systems, with graphene being much more robust to their effect.
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Affiliation(s)
- M Jo
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
| | - P Brasseur
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
| | - A Assouline
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
| | - G Fleury
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
| | - H-S Sim
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
| | - K Watanabe
- National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - T Taniguchi
- National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - W Dumnernpanich
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
| | - P Roche
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
| | - D C Glattli
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
| | - N Kumada
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
| | - F D Parmentier
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
| | - P Roulleau
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette Cedex France
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Lestari PR, Takei T, Kumada N. Novel ZnTi/C3N4/Ag LDH heterojunction composite for efficient photocatalytic phenol degradation. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2020.121858] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Abstract
A variety of bismuth oxides have been synthesized by hydrothermal reactions using NaBiO3·nH2O as a starting material.
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Affiliation(s)
- Md Saiduzzaman
- Department of Materials Science and Engineering
- Khulna University of Engineering & Technology
- Khulna-9203
- Bangladesh
| | - Takahiro Takei
- Center for Crystal Science and Technology
- University of Yamanashi
- Kofu 400-8511
- Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology
- University of Yamanashi
- Kofu 400-8511
- Japan
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Saiduzzaman M, Akutsu S, Kumada N, Takei T, Yanagida S, Yamane H, Kusano Y. Hydrothermal Synthesis and Crystal Structure of a Mixed-Valence Bismuthate, Na 3Bi 3O 8. Inorg Chem 2020; 59:4950-4960. [PMID: 32212697 DOI: 10.1021/acs.inorgchem.0c00213] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Four types of bismuth oxides, Na3Bi3O8, NaBiO3, α-Bi2O3, and ε-Bi2O3, were obtained by hydrothermal reactions using NaBiO3·nH2O in NaOH solution. The crystal structure of a new phase (Na3 Bi3+)Bi25+O8 ((Na0.75Bi0.25)2BiO4) was determined by using single crystal X-ray diffraction data, and this compound was found to show a Na2MnCl4-related structure with a monoclinic system (space group, Pm) with the following lattice parameters: a = 5.990 (2) Å, b = 3.335 (2) Å, c = 10.108 (2) Å, and β = 91.08 (3)°. The final R-factors R1 and wR2 were 0.041 and 0.090 (all data), respectively. The new phase was composed of mixed valence states of Bi (Bi3+ and Bi5+, with a mean Bi valence of 4.30) with five distinct Bi sites, where two Bi5+ (Bi1 and Bi2) fully occupied the distorted octahedral sites and three Bi3+ (Bi3, Bi4, and Bi5) were statistically distributed at the split sites with Na+ (Na3, Na4, and Na5). The Na6 site is fully occupied. The distorted Bi5+O6 octahedra formed one-dimensional chains via edge-sharing along the b-axis, with the chains held by Bi3+/Na+ split sites. The structural feature except for the split distribution of Bi3+/Na+ was classified as a Na2MnCl4-type structure. DFT calculations based on a model discounting the split distribution of Bi3+/Na+ indicated that Bi 6s and O 2p orbitals form sp hybridization at the conduction band. This new mixed valence bismuth oxide exhibited photocatalytic activity for phenol degradation under visible light irradiation. In addition to Na3Bi3O8, the hydrothermal reaction using NaBiO3·nH2O in NaOH solution yielded micrometer-sized single crystals of an ilmenite-type NaBiO3 and two polymorphs of bismuth oxides with monoclinic (α-Bi2O3) and orthorhombic (ε-Bi2O3) structures, depending on the reaction temperature and NaOH concentration.
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Affiliation(s)
- Md Saiduzzaman
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Shuhei Akutsu
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Sayaka Yanagida
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Hisanori Yamane
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Yoshihiro Kusano
- Department of Applied Chemistry and Biotechnology, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
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Saiduzzaman M, Yoshida H, Takei T, Yanagida S, Kumada N, Nagao M, Yamane H, Azuma M, Rubel MHK, Moriyoshi C, Kuroiwa Y. Hydrothermal Synthesis and Crystal Structure of a (Ba 0.54K 0.46) 4Bi 4O 12 Double-Perovskite Superconductor with Onset of the Transition Tc ∼ 30 K. Inorg Chem 2019; 58:11997-12001. [PMID: 31469548 DOI: 10.1021/acs.inorgchem.9b01768] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A new superconducting double perovskite was successfully synthesized by a low-temperature hydrothermal reaction at 240 °C. The crystal structure refinement of this double perovskite was done by single-crystal X-ray diffraction, and it had a cubic unit cell of a = 8.5207(2) Å with space group Im3̅m (No. 229). This superconducting double-perovskite chemical composition was estimated by electron probe microanalysis and was similar to the refined data. The superconducting transition temperature of the double perovskite was ∼30 K; the electrical resistivity began to fall at ∼25 K, and zero resistivity occurred below 7 K. Moreover, temperature-dependent resistivity under various magnetic fields and isothermal magnetization measurements ensured the nature of a type II superconductor for the sample. Finally, the metallic nature of the material was investigated by a first-principles study.
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Affiliation(s)
- Md Saiduzzaman
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Hikaru Yoshida
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Sayaka Yanagida
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Masanori Nagao
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Hisanori Yamane
- Institute of Multidisciplinary Research for Advanced Materials , Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai 980-8577 , Japan
| | - Masaki Azuma
- Laboratory for Materials and Structures , Tokyo Institute of Technology , 4259 Nagatsuta , Midori, Yokohama 226-8503 , Japan
| | - Mirza H K Rubel
- Department of Materials Science and Engineering , University of Rajshahi , Rajshahi 6205 , Bangladesh
| | - Chikako Moriyoshi
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashi-Hiroshima, Hiroshima 739-8526 , Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashi-Hiroshima, Hiroshima 739-8526 , Japan
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Yang G, Takei T, Yanagida S, Kumada N. Enhanced Supercapacitor Performance Based on CoAl Layered Double Hydroxide-Polyaniline Hybrid Electrodes Manufactured Using Hydrothermal-Electrodeposition Technology. Molecules 2019; 24:molecules24050976. [PMID: 30857377 PMCID: PMC6429460 DOI: 10.3390/molecules24050976] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/28/2019] [Accepted: 03/07/2019] [Indexed: 11/16/2022] Open
Abstract
Electrodes with nanosheet architectures can offer the possibility to achieve enhanced energy storage performance. Herein, we have designed and synthesized novel nanosheet structures of CoAl layered double hydroxide (LDH)-polyaniline (PANI) nanocomposite thin films by a hydrothermal-electrodeposition method. The molecular structure, crystal structure, morphology and chemical composition of the composites were characterized by FT-IR, XRD (SXRD), FESEM, and XPS, whereas their electrochemical properties were evaluated by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge tests. Compared with the unmodified CoAl LDH, the CoAl LDH-PANI exhibits significantly improved the specific capacitance and cyclic stability. The composite exhibits a high specific capacitance of 528 F/g at a current density of 10 A/g and excellent cyclic stability with an increase of the specific capacitance of 42.7% after 6000 cycle tests. We revealed the degradation behavior of PANI in 1 M KOH/KCl electrolyte, and the active degradation products also further increased the total specific capacitance of the composite. The enhanced electrochemical performance of the nanocomposite can be attributed to its well-designed nanostructure and the synergistic effects of each component. By analyzing the band structure and density of states of CoAl LDH and PANI, we proposed the possible mechanism of synergistic effect in a new perspective.
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Affiliation(s)
- Guoshen Yang
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan.
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan.
| | - Sayaka Yanagida
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan.
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan.
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14
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Saiduzzaman M, Takei T, Yanagida S, Kumada N, Das H, Kyokane H, Wakazaki S, Azuma M, Moriyoshi C, Kuroiwa Y. Hydrothermal Synthesis of Pyrochlore-Type Pentavalent Bismuthates Ca 2Bi 2O 7 and Sr 2Bi 2O 7. Inorg Chem 2019; 58:1759-1763. [PMID: 30652480 DOI: 10.1021/acs.inorgchem.8b03596] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The pyrochlore-type Ca2Bi2O7 and Sr2Bi2O7 have been synthesized from a low-temperature hydrothermal route using NaBiO3·nH2O as a starting material. The crystal structures of these compounds were refined using synchrotron powder X-ray diffraction data. The cell parameters were found to be a = 10.75021 (5) Å and 10.94132 (6) Å for Ca2Bi2O7 and Sr2Bi2O7, respectively. Density functional theory calculations showed the metallic band structure, but the negligible mixing of O2 2p bands with the A-site alkaline-earth-metal states and weak overlap with the conduction bands result in the semiconducting behavior.
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Affiliation(s)
- Md Saiduzzaman
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Sayaka Yanagida
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu 400-8511 , Japan
| | - Hena Das
- Laboratory for Materials and Structures , Tokyo Institute of Technology , 4259 Nagatsuta, Midori , Yokohama 226-8503 , Japan.,World Research Hub Initiative, Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta, Midori , Yokohama 226-8503 , Japan
| | - Hirokazu Kyokane
- Laboratory for Materials and Structures , Tokyo Institute of Technology , 4259 Nagatsuta, Midori , Yokohama 226-8503 , Japan
| | - Shogo Wakazaki
- Laboratory for Materials and Structures , Tokyo Institute of Technology , 4259 Nagatsuta, Midori , Yokohama 226-8503 , Japan
| | - Masaki Azuma
- Laboratory for Materials and Structures , Tokyo Institute of Technology , 4259 Nagatsuta, Midori , Yokohama 226-8503 , Japan
| | - Chikako Moriyoshi
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashi-Hiroshima , Hiroshima 739-8526 , Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashi-Hiroshima , Hiroshima 739-8526 , Japan
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15
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Matsuda M, Dissanayake SE, Abernathy DL, Qiu Y, Copley JRD, Kumada N, Azuma M. Frustrated magnetic interactions in an S = 3/2 bilayer honeycomb lattice compound Bi 3Mn 4O 12(NO 3). Phys Rev B 2019; 100:10.1103/physrevb.100.134430. [PMID: 33644522 PMCID: PMC7905988 DOI: 10.1103/physrevb.100.134430] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
An inelastic neutron scattering study has been performed in an S = 3/2 bilayer honeycomb lattice compound Bi3Mn4O12(NO3) at ambient and high magnetic fields. Relatively broad and monotonically dispersive magnetic excitations were observed at ambient field, where no long-range magnetic order exists. In the magnetic-field-induced long-range ordered state at 10 T, the magnetic dispersions become slightly more intense, albeit still broad as in the disordered state, and two excitation gaps, probably originating from an easy-plane magnetic anisotropy and intrabilayer interactions, develop. Analyzing the magnetic dispersions using the linear spin-wave theory, we estimated the intraplane and intrabilayer magnetic interactions, which are almost consistent with those determined by ab initio density functional theory calculations [M. Alaei et al., Phys. Rev. B 96, 140404(R) (2017)], except the third and fourth neighbor intrabilayer interactions. Most importantly, as predicted by the theory, there is no significant frustration in the honeycomb plane but frustrating intrabilayer interactions probably give rise to the disordered ground state.
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Affiliation(s)
- M Matsuda
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S E Dissanayake
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D L Abernathy
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Y Qiu
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - J R D Copley
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - N Kumada
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu 400-8511, Japan
| | - M Azuma
- Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
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16
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Takei T, Aoyama K, Yanagida S, Kumada N, Nakajima Y. Circumstances of La, Eu, Dy, and Yb Cations Intercalated via Ion Exchange in γ-Zirconium Phosphate. Inorg Chem 2018; 57:13097-13103. [PMID: 30351093 DOI: 10.1021/acs.inorgchem.8b01003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Both α- and γ-zirconium phosphate were examined for use as ion exchangers for recovery of rare earth elements. Trivalent rare earth elements can be partially substituted for protons in the interlayer space, and γ-zirconium phosphate shows a much better ion exchange competency than α-zirconium phosphate. The exchanged cation of the rare earth elements might be related to different amounts of oxygen from P-OH and H2O, and these rare earth elements were thus positioned at a different separations from the zirconium phosphate layer. The radial structure function (RSF) curve from extended X-ray absorption fine structure data implied that the calibrated M-O distance and coordination number changed with the ionic radius. The calibrated M-O distances from RSF were 2.52, 2.42, 2.38, and 2.28 for La, Eu, Dy, and Yb, respectively. The coordination numbers of oxygen for Yb were approximately 7 and greater than 10 for La and Eu, respectively. These smaller coordination numbers for smaller cations may result from the strong interaction between the cations and the zirconium phosphate layer. The Debye-Waller factor also increased with an increase in the ionic radius. These factors show a strong relation to the coordination state of rare earth elements in the unit cell of the γ-zirconium phosphate and to the interaction strength.
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Affiliation(s)
- Takahiro Takei
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 , Miyamae, Kofu , Yamanashi 400-8511 , Japan
| | - Kazuki Aoyama
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 , Miyamae, Kofu , Yamanashi 400-8511 , Japan
| | - Sayaka Yanagida
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 , Miyamae, Kofu , Yamanashi 400-8511 , Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 , Miyamae, Kofu , Yamanashi 400-8511 , Japan
| | - Yasushi Nakajima
- Daiichi Kigenso Kagaku Kogyo Co., Ltd. , 6-38 Hirabayashi Minami 1-Chome , Suminoe , Osaka 559-0025 , Japan
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17
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Saiduzzaman M, Yanagida S, Takei T, Kumada N, Ogawa K, Moriyoshi C, Kuroiwa Y, Kawaguchi S. Crystal Structure, Thermal Behavior, and Photocatalytic Activity of NaBiO 3· nH 2O. Inorg Chem 2018; 57:8903-8908. [PMID: 30015480 DOI: 10.1021/acs.inorgchem.8b00799] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The crystal structure of NaBiO3· nH2O was refined using synchrotron powder X-ray diffraction and was assigned to a trigonal unit cell (space group P3̅) consisting of layered structures formed by edge-sharing BiO6 octahedra and consisting of an interlayer composed of water molecules sandwiched between two layers of sodium atoms, perpendicular to the c axis. An intermediate phase was observed during the dehydration of the hydrated compound. Density of state calculations showed hybridization of the Bi 6s and O 2p orbitals at the bottom of the conduction bands for both the hydrated and the dehydrated phases, which narrows the band gap and promotes their photocatalytic activity in the visible region.
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Affiliation(s)
- Md Saiduzzaman
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu , Yamanashi 400-8511 , Japan
| | - Sayaka Yanagida
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu , Yamanashi 400-8511 , Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu , Yamanashi 400-8511 , Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology , University of Yamanashi , 7-32 Miyamae-cho , Kofu , Yamanashi 400-8511 , Japan
| | - Kazuya Ogawa
- Graduate Faculty of Interdisciplinary Research , University of Yamanashi , 4-3-11 Takeda , Kofu , Yamanashi 400-8511 , Japan
| | - Chikako Moriyoshi
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashi-Hiroshima , Hiroshima 739-8526 , Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science , Hiroshima University , 1-3-1 Kagamiyama , Higashi-Hiroshima , Hiroshima 739-8526 , Japan
| | - Shogo Kawaguchi
- Research and Utilization Division , Japan Synchrotron Radiation Research Institute (JASRI), SPring-8 , 1-1-1 Kouto , Sayo-cho, Sayo-gun , Hyogo 679-5198 , Japan
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18
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Iwai T, Uchida J, Matsuoka Y, Kosoku A, Shimada H, Nishide S, Kabei K, Kuwabara N, Yamamoto A, Naganuma T, Hamuro M, Kumada N, Takemoto Y, Nakatani T. Experience of Lymphangiography as a Therapeutic Tool for Lymphatic Leakage After Kidney Transplantation. Transplant Proc 2018; 50:2526-2530. [PMID: 30316391 DOI: 10.1016/j.transproceed.2018.03.095] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 03/02/2018] [Indexed: 10/17/2022]
Abstract
INTRODUCTION Lymphatic leakage after kidney transplantation is a relatively frequent complication but sometimes resistant to treatment, and there is no fixed treatment algorithm. The effectiveness of therapeutic lymphangiography for postoperative lymphatic or chyle leakage has been reported, but few reports are available regarding patients who have undergone kidney transplantation. In this study, we report our experience with lymphangiography as a therapeutic tool for lymphatic leakage after kidney transplantation. PATIENTS AND METHODS Intranodal lymphangiography for lymphatic leakage was performed in 4 patients (3 male, 1 female; age range, 38 to 70 years old) after living kidney transplantation at the Osaka City University Hospital in Japan. The amount of drainage before lymphangiography was 169 to 361 mL/day. The procedure for intranodal lymphangiography was as follows: the inguinal lymph node was punctured under ultrasound guidance, and the tip of the needle was instilled at the junction between the cortex and the hilum, after which Lipiodol was slowly and manually injected. RESULTS Lymphangiography was technically successful in 3 out of the 4 patients. In all successful cases, the amount of drainage decreased and leakage finally stopped without additional therapy such as sclerotherapy or fenestration. In 2 cases, we were able to directly detect the leakage site using lymphangiography. The time between lymphangiography and leakage resolution ranged from 8 to 13 days. There were neither complications of lymphangiography nor recurrence of lymphatic leakage in the successful cases. CONCLUSIONS Intranodal lymphangiography may be not only a diagnostic tool but also an effective, minimally-invasive, and safe method for treatment of lymphatic leakage resistant to drainage after kidney transplantation.
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Affiliation(s)
- T Iwai
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan.
| | - J Uchida
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Y Matsuoka
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - A Kosoku
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - H Shimada
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - S Nishide
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - K Kabei
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - N Kuwabara
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - A Yamamoto
- Department of Diagnostic and Interventional Radiology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - T Naganuma
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - M Hamuro
- Department of Diagnostic and Interventional Radiology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - N Kumada
- Department of Urology, Suita Municipal Hospital, Suita, Japan
| | - Y Takemoto
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - T Nakatani
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
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19
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Saiduzzaman M, Yanagida S, Takei T, Moriyoshi C, Kuroiwa Y, Kumada N. Hydrothermal Synthesis, Crystal Structure, and Visible-Region Photocatalytic Activity of BaBi2
O6. ChemistrySelect 2017. [DOI: 10.1002/slct.201700973] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Md Saiduzzaman
- Center for Crystal Science and Technology; University of Yamanashi; 7-32 Miyamae, Kofu 400-8511 Japan
| | - Sayaka Yanagida
- Center for Crystal Science and Technology; University of Yamanashi; 7-32 Miyamae, Kofu 400-8511 Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology; University of Yamanashi; 7-32 Miyamae, Kofu 400-8511 Japan
| | - Chikako Moriyoshi
- Department of Physical Science; Hiroshima University; 1-3-1 Kagamiyama, Higashihiroshima Hiroshima 739-8526 Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science; Hiroshima University; 1-3-1 Kagamiyama, Higashihiroshima Hiroshima 739-8526 Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology; University of Yamanashi; 7-32 Miyamae, Kofu 400-8511 Japan
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20
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Rubel MHK, Takei T, Kumada N, Ali MM, Miura A, Tadanaga K, Oka K, Azuma M, Magome E, Moriyoshi C, Kuroiwa Y. Hydrothermal Synthesis, Structure, and Superconductivity of Simple Cubic Perovskite (Ba 0.62K 0.38)(Bi 0.92Mg 0.08)O 3 with T c ∼ 30 K. Inorg Chem 2017; 56:3174-3181. [PMID: 28233995 DOI: 10.1021/acs.inorgchem.6b01853] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have synthesized a new superconducting perovskite bismuth oxide by a facile hydrothermal route at 220 °C. The choice of starting materials, their mixing ratios, and the hydrothermal reaction temperature was crucial for obtaining products with superior superconducting properties. The structure of the powder sample was investigated using laboratory X-ray diffraction, high-resolution synchrotron X-ray diffraction (SXRD) data, and electron diffraction (ED) patterns [transmission electron microscopy (TEM) analysis]. The refinement of SXRD data confirmed a simple perovskite-type structure with a cubic cell of a = 4.27864(2) Å [space group Pm3̅m (No. 221)]. Elemental analysis detected magnesium in the final products, and a refinement based on SXRD and inductively coupled plasma data yielded an ideal undistorted simple cubic perovskite-type structure, with the chemical composition (Ba0.62K0.38)(Bi0.92Mg0.08)O3. ED patterns also confirmed the simple cubic perovskite structure; the cube-shaped microstructures and compositional homogeneity on the nanoscale were verified by scanning electron microscopy and TEM analyses, respectively. The fabricated compound exhibited a large shielding volume fraction of about 98% with a maximum Tcmag of ∼30 K, which was supported by the measured bismuth valence as well. Its electrical resistivity dropped at ∼21 K, and zero resistivity was observed below 7 K. The compound underwent thermal decomposition above 400 °C. Finally, the calculated band structure showed a metallic behavior for this hydrothermally synthesized bismuth oxide.
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Affiliation(s)
- Mirza H K Rubel
- Department of Materials Science and Engineering, University of Rajshahi , Rajshahi 6205, Bangladesh.,Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - M Mozahar Ali
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Akira Miura
- Faculty of Engineering, Hokkaido University , Kita 13, Nishi 8, Kita-ku, Sapporo 060-8628, Japan
| | - Kiyoharu Tadanaga
- Faculty of Engineering, Hokkaido University , Kita 13, Nishi 8, Kita-ku, Sapporo 060-8628, Japan
| | - Kengo Oka
- Faculty of Science, Chuo University , 112-8551, 1-13-27, Kasuga, Bunkyo-ku, Tokyo 192-0393, Japan
| | - Masaki Azuma
- Laboratory for Materials and Structures, Tokyo Institute of Technology , 4259 Nagatsuta, Kanagawa 226-8503, Japan
| | - Eisuke Magome
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Chikako Moriyoshi
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
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Uchida J, Iwai T, Kuwabara N, Kabei K, Nishide S, Yamasaki T, Naganuma T, Kumada N, Takemoto Y, Nakatanti T. Clinical Experience of Late Conversion From Antimetabolites With Standard Exposure Calcineurin Inhibitors to Everolimus With Calcineurin Inhibitor Minimization in Stable Kidney Transplant Recipients With Good Renal Function. Transplant Proc 2017; 48:775-80. [PMID: 27234734 DOI: 10.1016/j.transproceed.2016.02.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 01/30/2016] [Accepted: 02/18/2016] [Indexed: 12/13/2022]
Abstract
INTRODUCTION This study describes our clinical experience of late conversion from antimetabolites with standard exposure calcineurin inhibitors (CNIs) to everolimus with CNI minimization in stable kidney transplant recipients with good graft function. PATIENTS AND METHODS A 1-year retrospective pilot study of 26 kidney recipients converted from antimetabolites with standard exposure CNIs to everolimus with CNI minimization was performed. The recipients enrolled in this study had normal or slightly impaired renal function defined as a serum creatinine value <2.0 mg/dL, and normal or slightly increased albuminuria defined as a urinary albumin excretion rate <100 mg/g creatinine. RESULTS The median time from transplant to conversion was 39.5 months posttransplant (range, 3-275). Treatment with everolimus was stopped owing to adverse events in 11 patients (42.3%). In the analysis of the patients in whom everolimus was maintained, the mean estimated glomerular filtration rate (eGFR) significantly increased from 50.7 ± 11.9 mL/min/1.73 m(2) at baseline to 53.6 ± 13.9 mL/min/1.73 m(2) at 1 year after conversion. In the patients in whom everolimus was stopped during the observation period, there was no difference in eGFR between baseline and 1 year after conversion. CONCLUSIONS This study demonstrated that, among the patients converted to everolimus at a late stage, there was no deterioration in renal function whether everolimus was maintained or stopped within 1 year after conversion.
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Affiliation(s)
- J Uchida
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan.
| | - T Iwai
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - N Kuwabara
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - K Kabei
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - S Nishide
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - T Yamasaki
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - T Naganuma
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - N Kumada
- Department of Urology, Suita Municipal Hospital, Suita, Japan
| | - Y Takemoto
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - T Nakatanti
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan
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Kumada N, Nakamura A, Miura A, Takei T, Azuma M, Yamamoto H, Magome E, Moriyoshi C, Kuroiwa Y. Hydrothermal synthesis and crystal structure of a new lithium copper bismuth oxide, LiCuBiO 4. J SOLID STATE CHEM 2017. [DOI: 10.1016/j.jssc.2016.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Parmentier FD, Cazimajou T, Sekine Y, Hibino H, Irie H, Glattli DC, Kumada N, Roulleau P. Quantum Hall effect in epitaxial graphene with permanent magnets. Sci Rep 2016; 6:38393. [PMID: 27922114 PMCID: PMC5138823 DOI: 10.1038/srep38393] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 11/08/2016] [Indexed: 11/09/2022] Open
Abstract
We have observed the well-kown quantum Hall effect (QHE) in epitaxial graphene grown on silicon carbide (SiC) by using, for the first time, only commercial NdFeB permanent magnets at low temperature. The relatively large and homogeneous magnetic field generated by the magnets, together with the high quality of the epitaxial graphene films, enables the formation of well-developed quantum Hall states at Landau level filling factors v = ±2, commonly observed with superconducting electro-magnets. Furthermore, the chirality of the QHE edge channels can be changed by a top gate. These results demonstrate that basic QHE physics are experimentally accessible in graphene for a fraction of the price of conventional setups using superconducting magnets, which greatly increases the potential of the QHE in graphene for research and applications.
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Affiliation(s)
- F D Parmentier
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif-sur-Yvette cedex, France
| | - T Cazimajou
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif-sur-Yvette cedex, France
| | - Y Sekine
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, Japan
| | - H Hibino
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, Japan
| | - H Irie
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, Japan
| | - D C Glattli
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif-sur-Yvette cedex, France
| | - N Kumada
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, Japan
| | - P Roulleau
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay 91191 Gif-sur-Yvette cedex, France
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Takei T, Iidzuka K, Miura A, Yanagida S, Kumada N, Magome E, Moriyoshi C, Kuroiwa Y. Adsorption Behavior of Rare Earth Metal Cations in the Interlayer Space of γ-ZrP. Langmuir 2016; 32:9993-9999. [PMID: 27652606 DOI: 10.1021/acs.langmuir.6b02747] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Adsorption competencies of rare earth metal cations in γ-zirconium phosphate were examined by ICP, synchrotron X-ray diffraction (SXRD), and ab initio simulation. The adsorption amounts are around 0.06-0.10 per zirconium phosphate. From the SXRD patterns of the adsorbed samples, the basal spacing estimated by c sin β increased linearly with an increasing ionic radius of rare earth metal cation, though a and b lattice constants show no change. These SXRD patterns can be classified into four groups that have different super lattices. The four superlattices have multiplicities of x131, x241, and x221 for the xabc axis, and the location of the rare earth metal cation in the original unit cell changes depending on the superlattice cell. In the x131 superlattice, Yb and Er occupied the site near the zirconium phosphate layer, though La and Ce in the x221 superlattice remained in the center position between the phosphate sheet. For the ab initio simulation of γ-ZrP with the typical rare earth metal cations (Tb, Eu, Dy, and La), the results of simulation show a similar tendency of the position estimated by SXRD refinements.
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Affiliation(s)
- Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Kiyoaki Iidzuka
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Akira Miura
- Faculty of Engineering, Division of Applied Chemistry, Hokkaido University , Kita 13 Nichi 8, Kita-ku, Sapporo 060-8628, Japan
| | - Sayaka Yanagida
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Eisuke Magome
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashi-hiroshima, Hiroshima 739-8526, Japan
| | - Chikako Moriyoshi
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashi-hiroshima, Hiroshima 739-8526, Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashi-hiroshima, Hiroshima 739-8526, Japan
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Affiliation(s)
- Octavianti Naa
- Center
for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Nobuhiro Kumada
- Center
for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Akira Miura
- Faculty of Engineering, Hokkaido University, Kita 13,
Nishi 8, Kita-ku, Sapporo 060-8628, Japan
| | - Takahiro Takei
- Center
for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae-cho, Kofu 400-8511, Japan
| | - Masaki Azuma
- Materials and Structural
Laboratory, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku Yokohama, Kanagawa 226-8503, Japan
| | - Yoshihiro Kusano
- Department of Applied
Arts and Design, Kurashiki University of Science and the Arts, 2640 Nishinoura, Tsurajima-cho, Kurashiki, Okayama 712-8505, Japan
| | - Kengo Oka
- Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
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Miura A, Mizuguchi Y, Sugawara T, Wang Y, Takei T, Kumada N, Magome E, Moriyoshi C, Kuroiwa Y, Miura O, Tadanaga K. Structural Difference in Superconductive and Nonsuperconductive Bi-S Planes within Bi4O4Bi2S4 Blocks. Inorg Chem 2015; 54:10462-7. [PMID: 26479778 DOI: 10.1021/acs.inorgchem.5b01919] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The relationship between the structure and superconductivity of Bi4O4S3 powders synthesized by heating under ambient and high pressures was investigated using synchrotron X-ray diffraction, Raman spectroscopy, and transmission electron microscopy (TEM) observation. The Bi4O4S3 powders synthesized under ambient pressure exhibited a strong superconductivity (diamagnetic) signal and zero resistivity below ∼4.5 K, while the Bi4O4S3 powder synthesized by the high-pressure method exhibited a low-intensity signal down to 2 K. Further annealing of the latter Bi4O4S3 powder under ambient pressure led to the development of a strong signal and zero resistivity. The crystal structures of all Bi4O4S3 phases consisted of Bi4O4Bi2S4 blocks including a Bi-S layer and anion(s) sandwiched between Bi4O4Bi2S4 blocks, but minor structural differences were detected. A comparison of the structures of the superconductive and nonsuperconductive Bi4O4S3 samples suggested that the superconductive Bi4O4S3 phases had slightly smaller lattice parameters. The average structures of the superconductive Bi4O4S3 phases were characterized by a slightly shorter and less bent Bi-S plane. Raman spectroscopy detected vibration of the S-O bonds, which can be attributed to sandwiched anion(s) such as SO4(2-). TEM observation showed stacking faults in the superconductive Bi4O4S3 phases, which indicated local fluctuation of the average structures. The observed superconductivity of Bi4O4S3 was discussed based on impurity phases, enhanced hybridization of the px and py orbitals of the Bi-S plane within Bi4O4Bi2S4 blocks, local fluctuation of the average structures, compositional deviation related to suspicious anion(s) sandwiched between Bi4O4Bi2S4 blocks, and the possibility of suppression of the charge-density-wave state by enriched carrier concentrations.
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Affiliation(s)
- Akira Miura
- Faculty of Engineering Hokkaido University , Kita 13, Nishi 8, Sapporo 060-8628 Japan
| | - Yoshikazu Mizuguchi
- Department of Electrical and Electronic Engineering, Tokyo Metropolitan University , 1-1 minami-osawa, Hachioji, Tokyo 192-0397 Japan
| | - Tsuyoshi Sugawara
- Department of Electrical and Electronic Engineering, Tokyo Metropolitan University , 1-1 minami-osawa, Hachioji, Tokyo 192-0397 Japan
| | - Yongming Wang
- Creative Research Institution Hokkaido University , Kita 21, Nishi 10, Sapporo 001-0021, Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae, Kofu 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi , 7-32 Miyamae, Kofu 400-8511, Japan
| | - Eisuke Magome
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Chikako Moriyoshi
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science, Hiroshima University , 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Osuke Miura
- Department of Electrical and Electronic Engineering, Tokyo Metropolitan University , 1-1 minami-osawa, Hachioji, Tokyo 192-0397 Japan
| | - Kiyoharu Tadanaga
- Faculty of Engineering Hokkaido University , Kita 13, Nishi 8, Sapporo 060-8628 Japan
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Mizuguchi Y, Miura A, Kajitani J, Hiroi T, Miura O, Tadanaga K, Kumada N, Magome E, Moriyoshi C, Kuroiwa Y. In-plane chemical pressure essential for superconductivity in BiCh2-based (Ch: S, Se) layered structure. Sci Rep 2015; 5:14968. [PMID: 26447333 PMCID: PMC4597362 DOI: 10.1038/srep14968] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 09/14/2015] [Indexed: 11/08/2022] Open
Abstract
BiCh2-based compounds (Ch: S, Se) are a new series of layered superconductors, and the mechanisms for the emergence of superconductivity in these materials have not yet been elucidated. In this study, we investigate the relationship between crystal structure and superconducting properties of the BiCh2-based superconductor family, specifically, optimally doped Ce1-xNdxO0.5F0.5BiS2 and LaO0.5F0.5Bi(S1-ySey)2. We use powder synchrotron X-ray diffraction to determine the crystal structures. We show that the structure parameter essential for the emergence of bulk superconductivity in both systems is the in-plane chemical pressure, rather than Bi-Ch bond lengths or in-plane Ch-Bi-Ch bond angle. Furthermore, we show that the superconducting transition temperature for all REO0.5F0.5BiCh2 superconductors can be determined from the in-plane chemical pressure.
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Affiliation(s)
- Yoshikazu Mizuguchi
- Department of Electrical and Electronic Engineering, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji 192-0397, Japan
| | - Akira Miura
- Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628 Japan
| | - Joe Kajitani
- Department of Electrical and Electronic Engineering, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji 192-0397, Japan
| | - Takafumi Hiroi
- Department of Electrical and Electronic Engineering, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji 192-0397, Japan
| | - Osuke Miura
- Department of Electrical and Electronic Engineering, Tokyo Metropolitan University, 1-1, Minami-osawa, Hachioji 192-0397, Japan
| | - Kiyoharu Tadanaga
- Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628 Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu 400-8511 Japan
| | - Eisuke Magome
- Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526 Japan
| | - Chikako Moriyoshi
- Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526 Japan
| | - Yoshihiro Kuroiwa
- Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526 Japan
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Kumada N, Parmentier FD, Hibino H, Glattli DC, Roulleau P. Shot noise generated by graphene p-n junctions in the quantum Hall effect regime. Nat Commun 2015; 6:8068. [PMID: 26337067 PMCID: PMC5426518 DOI: 10.1038/ncomms9068] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 07/13/2015] [Indexed: 11/11/2022] Open
Abstract
Graphene offers a unique system to investigate transport of Dirac Fermions at p–n junctions. In a magnetic field, combination of quantum Hall physics and the characteristic transport across p–n junctions leads to a fractionally quantized conductance associated with the mixing of electron-like and hole-like modes and their subsequent partitioning. The mixing and partitioning suggest that a p–n junction could be used as an electronic beam splitter. Here we report the shot noise study of the mode-mixing process and demonstrate the crucial role of the p–n junction length. For short p–n junctions, the amplitude of the noise is consistent with an electronic beam-splitter behaviour, whereas, for longer p–n junctions, it is reduced by the energy relaxation. Remarkably, the relaxation length is much larger than typical size of mesoscopic devices, encouraging using graphene for electron quantum optics and quantum information processing. Dirac fermions at a p–n junction can exhibit a wide variety of unusual properties. Here, the authors investigate the dynamics of such fermions in a graphene junction using shot noise measurements and demonstrate the crucial role of junction length.
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Affiliation(s)
- N Kumada
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan.,Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - F D Parmentier
- Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - H Hibino
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
| | - D C Glattli
- Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - P Roulleau
- Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
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Xu N, Takei T, Miura A, Kumada N, Katsumata KI, Matsushita N, Okada K. Study on the Effect of Pt Intercalation into Layered Niobate Perovskite for Photocatalytic Behavior. Langmuir 2015; 31:7660-7665. [PMID: 26084377 DOI: 10.1021/acs.langmuir.5b01958] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A novel photocatalyst consisting of an intercalated perovskite H(1-2x)Pt(x)LaNb2O7 was fabricated by ion exchange. Synchrotron X-ray diffraction and X-ray photoelectron spectroscopy results confirmed that Pt(2+) exists within the interlayer space of the layered perovskite. H(1-2x)Pt(x)LaNb2O7 composed of layered niobate perovskite and intercalated Pt(2+) completely degraded a 20 ppm phenol solution in 3 h under irradiation by Xe light, which exhibits photocatalytic activity superior to those of RbLaNb2O7, Pt-deposited RbLaNb2O7, and HLaNb2O7. From first-principles density functional theory simulation, high photocatalytic activity of H(1-2x)Pt(x)LaNb2O7 is attributed to the emergence of a new O 2p-Pt 5d hybridized band on top of the valence band.
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Affiliation(s)
- Nan Xu
- †Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Takahiro Takei
- †Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Akira Miura
- ‡Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Nobuhiro Kumada
- †Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Ken-ichi Katsumata
- §Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226-8503, Japan
| | - Nobuhiro Matsushita
- §Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226-8503, Japan
| | - Kiyoshi Okada
- §Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226-8503, Japan
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Kobayashi E, Ueno S, Nakashima K, Kumada N, Suzuki TS, Uchikoshi T, Sakka Y, Fujii I, Wada S. Fabrication of (111)-oriented Tetragonal BaTiO 3 Ceramics by an Electrophoretic Deposition in a High Magnetic Field. ACTA ACUST UNITED AC 2015. [DOI: 10.14723/tmrsj.40.223] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kumada N, Roulleau P, Roche B, Hashisaka M, Hibino H, Petković I, Glattli DC. Resonant edge magnetoplasmons and their decay in graphene. Phys Rev Lett 2014; 113:266601. [PMID: 25615366 DOI: 10.1103/physrevlett.113.266601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Indexed: 06/04/2023]
Abstract
We investigate resonant edge magnetoplasmons (EMPs) and their decay in graphene by high-frequency electronic measurements. From EMP resonances in disk shaped graphene, we show that the dispersion relation of EMPs is nonlinear due to interactions, giving rise to the intrinsic decay of EMP wave packets. We also identify extrinsic dissipation mechanisms due to interaction with localized states in bulk graphene from the decay time of EMP wave packets. We indicate that, owing to the linear band structure and the sharp edge potential, EMP dissipation in graphene can be lower than that in GaAs systems.
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Affiliation(s)
- N Kumada
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan and Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - P Roulleau
- Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - B Roche
- Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - M Hashisaka
- Department of Physics, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8551, Japan
| | - H Hibino
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
| | - I Petković
- Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
| | - D C Glattli
- Nanoelectronics Group, Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France
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Takei T, Muraki N, Xu N, Miura A, Kumada N. Anodic hybridization of fluorinated layered perovskite nanosheet with polyaniline for electrochemical capacitor. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.07.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Miura A, Nagao M, Takei T, Watauchi S, Tanaka I, Kumada N. Crystal structures of LaO1−xFxBiS2 (x~0.23, 0.46): Effect of F doping on distortion of Bi–S plane. J SOLID STATE CHEM 2014. [DOI: 10.1016/j.jssc.2014.01.035] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kamata H, Kumada N, Hashisaka M, Muraki K, Fujisawa T. Fractionalized wave packets from an artificial Tomonaga-Luttinger liquid. Nat Nanotechnol 2014; 9:177-181. [PMID: 24509659 DOI: 10.1038/nnano.2013.312] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 12/20/2013] [Indexed: 06/03/2023]
Abstract
The model of interacting fermion systems in one dimension known as a Tomonaga-Luttinger liquid (TLL) provides a simple and exactly solvable theoretical framework that predicts various intriguing physical properties. Evidence of a TLL has been observed as power-law behaviour in electronic transport on various types of one-dimensional conductor. However, these measurements, which rely on d.c. transport involving electron tunneling processes, cannot identify the long-awaited hallmark of charge fractionalization, in which an injection of elementary charge e from a non-interacting lead is divided into the non-trivial effective charge e* and the remainder, e-e* (refs 6, 7, 8). Here, we report time-resolved transport measurements on an artificial TLL composed of coupled integer quantum Hall edge channels, in which we successfully identify single charge fractionalization processes. A wave packet of charge q incident from a non-interacting region breaks up into several fractionalized charge wave packets at the edges of the artificial TLL, from which transport eigenmodes can be evaluated directly. These results are informative for elucidating the nature of TLLs and low-energy excitations in the edge channels.
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Affiliation(s)
- H Kamata
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
| | - N Kumada
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - M Hashisaka
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
| | - K Muraki
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - T Fujisawa
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
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Uchida J, Iwai T, Kabei K, Machida Y, Kuwabara N, Naganuma T, Kumada N, Nakatani T. Effects of Conversion From a Twice-Daily Tacrolimus to a Once-Daily Tacrolimus on Glucose Metabolism in Stable Kidney Transplant Recipients. Transplant Proc 2014; 46:532-6. [DOI: 10.1016/j.transproceed.2013.11.146] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 11/07/2013] [Accepted: 11/27/2013] [Indexed: 12/21/2022]
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Rubel MHK, Miura A, Takei T, Kumada N, Mozahar Ali M, Nagao M, Watauchi S, Tanaka I, Oka K, Azuma M, Magome E, Moriyoshi C, Kuroiwa Y, Azharul Islam AKM. Superconducting Double Perovskite Bismuth Oxide Prepared by a Low-Temperature Hydrothermal Reaction. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400607] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Rubel MHK, Miura A, Takei T, Kumada N, Mozahar Ali M, Nagao M, Watauchi S, Tanaka I, Oka K, Azuma M, Magome E, Moriyoshi C, Kuroiwa Y, Azharul Islam AKM. Superconducting double perovskite bismuth oxide prepared by a low-temperature hydrothermal reaction. Angew Chem Int Ed Engl 2014; 53:3599-603. [PMID: 24573781 DOI: 10.1002/anie.201400607] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Indexed: 11/07/2022]
Abstract
Perovskite-type structures (ABO3) have received significant attention because of their crystallographic aspects and physical properties, but there has been no clear evidence of a superconductor with a double-perovskite-type structure, whose different elements occupy A and/or B sites in ordered ways. In this report, hydrothermal synthesis at 220 °C produced a new superconductor with an A-site-ordered double perovskite structure, (Na(0.25)K(0.45))(Ba(1.00))3(Bi(1.00))4O12, with a maximum T(c) of about 27 K.
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Affiliation(s)
- Mirza H K Rubel
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae Kofu 400-8511 (Japan)
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38
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Uchida J, Iwai T, Machida Y, Kuwabara N, Kabei K, Kumada N, Nakatani T. Insulin resistance and insulin secretion in renal transplant recipients with hepatitis C. Transplant Proc 2013; 45:1540-3. [PMID: 23726615 DOI: 10.1016/j.transproceed.2013.01.053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 01/03/2013] [Indexed: 01/07/2023]
Abstract
BACKGROUND Several reports have suggested an association between hepatitis C virus (HCV) infection and new-onset diabetes after transplantation (NODAT). NODAT is a common complication after renal transplantation, and it has been associated with increased long-term morbidity and mortality. HCV-positive recipients may have abnormal glucose metabolism, even though NODAT has never been previously diagnosed. The aim of this study was to analyze the pathogenic factors responsible for glucose metabolism in a series of HCV-positive renal transplant recipients. METHODS The study population comprised 16 renal transplant patients who received their grafts from deceased or living donors with anti-HCV antibodies. HCV-negative transplant recipients were individually matched with these HCV-positive recipients by year of transplantation, sex, age, serum creatinine levels, and type of calcineurin inhibitors. None of the patients had been diagnosed with diabetes. Insulin secretion and insulin resistance were determined by a 75-g oral glucose tolerance test (OGTT) and compared between the 2 groups. Categories of glucose tolerance were defined according to World Health Organization criteria. RESULTS Glucose intolerance (impaired fasting glucose, impaired glucose tolerance, diabetes mellitus) as assessed by OGTT was detected in 7 of the HCV-positive recipients (43.8%) and 3 of the HCV-negative recipients. The homeostasis model assessment of insulin resistance was greater in the HCV-positive recipients than in the HCV-negative recipients. The homeostasis model assessment of β-cell function was higher in the HCV-positive recipients than in the HCV-negative recipients. CONCLUSIONS The frequency of glucose intolerance tended to be higher in HCV-positive recipients. Furthermore, insulin resistance was greater and insulin secretion higher in HCV-positive recipients, which indicated that the increase in insulin secretion compensated for insulin resistance observed in these patients. However, HCV-positive renal transplant recipients may ultimately develop NODAT as this compensation diminishes with time.
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Affiliation(s)
- J Uchida
- Department of Urology, Osaka City University Graduate School of Medicine, Osaka, Japan.
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39
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Affiliation(s)
- Akira Miura
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Takahiro Takei
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, University of Yamanashi, 7-32 Miyamae, Kofu, Yamanashi 400-8511, Japan
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Miura A, Takei T, Kumada N, Wada S, Magome E, Moriyoshi C, Kuroiwa Y. Bonding Preference of Carbon, Nitrogen, and Oxygen in Niobium-Based Rock-Salt Structures. Inorg Chem 2013; 52:9699-701. [DOI: 10.1021/ic400830b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akira Miura
- Center
for Crystal Science and Technology, University of Yamanashi, Miyamae 7-32 Kofu 400-8511 Japan, ‡Interdisciplinary Graduated School
of Medicine and Engineering, University of Yamanashi, 4–4–37 Takeda, Kofu 400–8510
Japan, §Department of
Physical Science, Hiroshima University, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Takahiro Takei
- Center
for Crystal Science and Technology, University of Yamanashi, Miyamae 7-32 Kofu 400-8511 Japan, ‡Interdisciplinary Graduated School
of Medicine and Engineering, University of Yamanashi, 4–4–37 Takeda, Kofu 400–8510
Japan, §Department of
Physical Science, Hiroshima University, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Nobuhiro Kumada
- Center
for Crystal Science and Technology, University of Yamanashi, Miyamae 7-32 Kofu 400-8511 Japan, ‡Interdisciplinary Graduated School
of Medicine and Engineering, University of Yamanashi, 4–4–37 Takeda, Kofu 400–8510
Japan, §Department of
Physical Science, Hiroshima University, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Satoshi Wada
- Center
for Crystal Science and Technology, University of Yamanashi, Miyamae 7-32 Kofu 400-8511 Japan, ‡Interdisciplinary Graduated School
of Medicine and Engineering, University of Yamanashi, 4–4–37 Takeda, Kofu 400–8510
Japan, §Department of
Physical Science, Hiroshima University, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Eisuke Magome
- Center
for Crystal Science and Technology, University of Yamanashi, Miyamae 7-32 Kofu 400-8511 Japan, ‡Interdisciplinary Graduated School
of Medicine and Engineering, University of Yamanashi, 4–4–37 Takeda, Kofu 400–8510
Japan, §Department of
Physical Science, Hiroshima University, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Chikako Moriyoshi
- Center
for Crystal Science and Technology, University of Yamanashi, Miyamae 7-32 Kofu 400-8511 Japan, ‡Interdisciplinary Graduated School
of Medicine and Engineering, University of Yamanashi, 4–4–37 Takeda, Kofu 400–8510
Japan, §Department of
Physical Science, Hiroshima University, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Yoshihiro Kuroiwa
- Center
for Crystal Science and Technology, University of Yamanashi, Miyamae 7-32 Kofu 400-8511 Japan, ‡Interdisciplinary Graduated School
of Medicine and Engineering, University of Yamanashi, 4–4–37 Takeda, Kofu 400–8510
Japan, §Department of
Physical Science, Hiroshima University, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
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Adilina IB, Hara T, Ichikuni N, Kumada N, Shimazu S. Recyclable Pd-Incorporated Perovskite-Titanate Catalysts Synthesized in Molten Salts for the Liquid-Phase Oxidation of Alcohols with Molecular Oxygen. BCSJ 2013. [DOI: 10.1246/bcsj.20120215] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Indri Badria Adilina
- Graduate School of Engineering, Chiba University
- Research Centre for Chemistry, Indonesian Institute of Sciences
| | | | | | - Nobuhiro Kumada
- Graduate School of Medicine and Engineering, University of Yamanashi
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Kumada N, Tanabe S, Hibino H, Kamata H, Hashisaka M, Muraki K, Fujisawa T. Plasmon transport in graphene investigated by time-resolved electrical measurements. Nat Commun 2013; 4:1363. [PMID: 23322051 PMCID: PMC3562445 DOI: 10.1038/ncomms2353] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 12/03/2012] [Indexed: 11/08/2022] Open
Abstract
Plasmons, which are collective charge oscillations, could provide a means of confining electromagnetic field to nanoscale structures. Recently, plasmonics using graphene have attracted interest, particularly because of the tunable plasmon dispersion, which will be useful for tunable frequency in cavity applications. However, the carrier density dependence of the dispersion is weak (proportional to n(1/4)) and it is difficult to tune the frequency over orders of magnitude. Here, by exploiting electronic excitation and detection, we carry out time-resolved measurements of a charge pulse travelling in a plasmon mode in graphene corresponding to the gigahertz range. We demonstrate that the plasmon velocity can be changed over two orders of magnitude by applying a magnetic field B and by screening the plasmon electric field with a gate metal; at high B, edge magnetoplasmons, which are plasmons localized at the sample edge, are formed and their velocity depends on B, n and the gate screening effect.
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Affiliation(s)
- N Kumada
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
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Affiliation(s)
- Miyabi Kobayashi
- Center for Crystal Science and Technology, Faculty of Engineering, University of Yamanashi
| | - Nobuhiro Kumada
- Center for Crystal Science and Technology, Faculty of Engineering, University of Yamanashi
| | - Akira Miura
- Center for Crystal Science and Technology, Faculty of Engineering, University of Yamanashi
| | - Takahiro Takei
- Center for Crystal Science and Technology, Faculty of Engineering, University of Yamanashi
| | - Ichiro Fujii
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Satoshi Wada
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
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Machida Y, Uchida J, Kuwabara N, Kabei K, Koyama Y, Tachibana H, Naganuma T, Iwai T, Kumada N, Nakatani T. Once Daily Prolonged-Release Tacrolimus in de Novo Renal Transplantation: A Single-Center Experience. Transplantation 2012. [DOI: 10.1097/00007890-201211271-01976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Uchida J, Machida Y, Iwai T, Kuwabara N, Kabei K, Kumada N, Nakatani T. Glucose Intolerance Is Associated with Increased Intimal Medial Thickness of the Carotid Artery and Increased Pulse Wave Velocity in Renal Transplant Recipients. Transplantation 2012. [DOI: 10.1097/00007890-201211271-01618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Uchida J, Machida Y, Iwai T, Kuwabara N, Kabei K, Kumada N, Nakatani T. Glucose Intolerance Is Associated with Increased Intimal Medial Thickness of the Carotid Artery and Increased Pulse Wave Velocity in Renal Transplant Recipients. Transplantation 2012. [DOI: 10.1097/00007890-201211271-00583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Affiliation(s)
- L. Tiemann
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
- ERATO Nuclear Spin Electronics Project, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan
| | - G. Gamez
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
| | - N. Kumada
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
| | - K. Muraki
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan
- ERATO Nuclear Spin Electronics Project, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan
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Takei T, Miura A, Kumada N. Electrodeposition of exfoliated nanosheet colloid from the partially substituted birnessite and electrochemical property. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.01.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Uchida J, Kuwabara N, Machida Y, Iwai T, Naganuma T, Kumada N, Nakatani T. Conversion of Stable Kidney Transplant Recipients From a Twice-Daily Prograf to a Once-Daily Tacrolimus Formulation: A Short-Term Study on its Effects on Glucose Metabolism. Transplant Proc 2012; 44:128-33. [DOI: 10.1016/j.transproceed.2011.11.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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