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International Symposium on Electronic/Optic Functional Molecules(光电功能分子国际研讨会)

作者： Yun Li Chuan Liu Yong Xu Peter Darmawan Takeo Minari Kazuhito Tsukagoshi International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS) Tsukuba Ibaraki 305-0044 Japan International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS) Tsukuba Ibaraki 305-0044 Japan Core Research of Evolutional Science & Technology(CREST) Japan Science and Technology Agency(JST) Kawaguchi Saitama 332-0012 Japan

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Ambipolar transport in bulk crystals of a topological insulator by gating with ionic liquid

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Physical Review B 2012年第7期86卷 075306-075306页

作者： Kouji Segawa Zhi Ren Satoshi Sasaki Tetsuya Tsuda Susumu Kuwabata Yoichi Ando Institute of Scientific and Industrial Research Osaka University Ibaraki Osaka 567-0047 Japan Frontier Research Base for Global Young Researchers Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan Department of Applied Chemistry Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Kawaguchi Saitama 332-0012 Japan

We report that the ionic-liquid gating of bulk single crystals of a topological insulator can control the type of the surface carriers and even results in ambipolar transport. This was made possible by the use of a highly bulk-insulating BiSbTeSe2 system where the chemical potential is located close to both the surface Dirac point and the middle of the bulk band gap. Thanks to the use of ionic liquid, the control of the surface chemical potential by gating was possible on the whole surface of a bulk three-dimensional sample, opening new experimental opportunities for topological insulators. In addition, our data suggest the existence of a nearly reversible electrochemical reaction that causes bulk carrier doping into the crystal during the ionic-liquid gating process.

关键词： TOPOLOGICAL insulators GATING system (Founding) IONIC liquids DIRAC equation BISMUTH compounds ELECTROCHEMISTRY

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Molecular screening on a chip by DNA-displayed protein microarray

Molecular screening on a chip by DNA-displayed protein micro...

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15th International Conference on Miniaturized Systems for Chemistry and Life sciences 2011, MicroTAS 2011

作者： Biyani, M. Kobayashi, R. Sato, S. Ichiki, T. School of Engineering University of Tokyo Tokyo Japan Core Research of Evolutional Science and Technology JST Japan

ISBN: (纸本)9781618395955

Self-assembled and spatially addressable protein microarrays are poised to become a central proteomics technology. However, it has been burdened with issues of reproducibility and standardization mainly due to the less availability of functionalized surface chemistry. Here, a microintaglio printing-based system is described that relies on coupling cDNA display technique with scaffolded DNA origami to print in situ-synthesized protein microarray on gold surface. A microarray of genotypes encoding the green fluorescent protein variants was patterned on gold-thiol surface using a three-way junctions (TWJs) formed from two single-stranded oligonucleotides with self-complementary sticky ends and a PDMS micromold comprising an array of uniformly arranged 4 μm-diameter holes at a density of 10,000 per mm 2.

关键词： Oligonucleotides

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Abrupt change in the energy gap of superconducting Ba1−xKxFe2As2 single crystals with hole doping

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Physical Review B 2012年第16期86卷 165117-165117页

作者： W. Malaeb T. Shimojima Y. Ishida K. Okazaki Y. Ota K. Ohgushi K. Kihou T. Saito C. H. Lee S. Ishida M. Nakajima S. Uchida H. Fukazawa Y. Kohori A. Iyo H. Eisaki C.-T. Chen S. Watanabe H. Ikeda S. Shin Institute for Solid State Physics (ISSP) University of Tokyo Kashiwa-no-ha Kashiwa Chiba 277-8581 Japan Transformative Research-project on Iron Pnictides (TRIP) Japan Science and Technology Agency (JST) Chiyoda-ku Tokyo 102-0075 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Chiyoda-ku Tokyo 102-0075 Japan National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8568 Japan Department of Physics Chiba University Chiba 263-8522 Japan Department of Physics University of Tokyo Tokyo 113-8656 Japan Beijing Center for Crystal Research and Development Chinese Academy of Science (CAS) Zhongguancun Beijing 100190 China Department of Physics Kyoto University Sakyo-ku Kyoto 606-8502 Japan

We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba1−xKxFe2As2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for x≳ 0.6) while the inner and middle FS gaps roughly scale with Tc. This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of X2−Y2 and XZ/YZ orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors.

关键词： ENERGY gaps (Physics) SUPERCONDUCTIVITY DOPING agents (Chemistry) SINGLE crystals PHOTOELECTRON spectroscopy BRILLOUIN zones FERMI surfaces

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O040 A novel role of Dectin-1 signaling in promoting intestinal inflammation

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Cytokine 2012年第3期59卷 516-516页

作者： C. Tang T. Kamiya M. Kadoki Y. Iwakura Division of Laboratory Animal Research Institute for Biomedical Sciences Tokyo University of Science Noda Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency Saitama Japan

Introduction Dectin-1, which was first reported as a dentritic cell-specific type II C-type lectin family member, is the receptor for β-1,3 or −1,6-linked glucans (β-glucans), an important cell wall components of fungi and yeasts. Dysregulated response of mucosal immune system toward intraluminal bacteria results in the human inflammatory bowel disease (IBD). Beta-glucan is thought to promote the mucosal immunity in intestines, but the roles of Dectin-1 in mucosal immune system are still unknown. Methods To investigate the potential role of Dectin-1 in development of IBD, we administrated Decint-1 deficient ( clec7a −/− ) mice with dextran sulfate sodium (DSS) to induce the acute ulcerative colitis and found that clec7a −/− mice were significantly resistant to DSS-induced colitis compared to wild-type (WT) mice, associated with lower production of TNF-α and reduced numbers of neutrophils and macrophages in lamina propria of colon. Results Pre-treatment of dectin-1 antagonist ligand Laminarin could suppress the acute intestinal inflammation induced by DSS. Metagenome analysis using bacterial 16s rRNA genes revealed significantly change of the microflora in small intestine and colon of clec7a −/− mice compared to WT mice, and administration of intestinal bacteria of clec7a −/− mice in SPF condition to germ-free WT mice also showed resistant to DSS-induced colitis. Conclusion These new findings identify Dectin-1 as novel factor in promotion of acute colitis by directly inducing proinflammatory cytokines and by regulating the balance of intestinal microbiota. Blockade of Dectin-1 signaling suggests new therapeutic strategies for inflammatory bowel diseases.

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The characteristics of the supercontinuum generation using a photonic crystal fiber with low dispersion

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2012年第11期132卷 1873-1879页

作者： Sone, Hiroyasu Harada, Yasuhiro Nakamura, Shinki Yoshitomi, Dai Takada, Hideyuki Kasahara, Ryo Torizuka, Kenji Faculty of Engineering Kitami Institute of Technology 165 Koen-cho Kitami-shi Hokkaido 090-8507 Japan Faculty of Engineering Ibaraki University 4-12-1 Nakanarusawa-cho Hitachi Ibaraki 316-8511 Japan Frontier Research Center for Applied Atomic Sciences Ibaraki University 162-1 Shirakata Tokaimura Naka-gun Ibaraki 319-1106 Japan National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono Tsukuba Ibaraki 305-8568 Japan Core Research for Evolutional Science and Technology 1-1-1 Umezono Tsukuba Ibaraki 305-8568 Japan

Recently, optical pulses propagating through a photonic crystal fiber (PCF) of a special design were reported to yield a broad and flat supercontinuum (SC) spectrum around 1000 nm because the fiber dispersion characteristics are of low dispersion around 1000 nm. This study was undertaken to investigate spectral characteristics of SC pulses generated in two low dispersion PCFs which are a highly nonlinear PCF with group velocity dispersion (GVD) having an extremum value at zero dispersion and a lowly nonlinear PCF with GVD crossing zero dispersion. The influence of incident light pulse parameters (power, pulse width and chirp) and fiber length on SC spectra was also examined using those PCFs. Results show that highly nonlinear PCF with GVD distributions having an extremum value and zero dispersion around 1000 nm is useful. © 2012 The Institute of Electrical Engineers of Japan.

关键词： Supercontinuum generation

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Reduction of charge injection barrier by 1-nm contact oxide interlayer in organic field effect transistors

Reduction of charge injection barrier by 1-nm contact oxide ...

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International Symposium on Electronic/Optic Functional Molecules(光电功能分子国际研讨会)

作者： P.Darmawan T.Minari A.Kumatani Y.Li C.Liu K.Tsukagoshi RIKEN Wako Saitama 351-0198 Japan International Center for Materials Architectronics(WPI-MANA) National Institute for Materials Science(NIMS) Tsukuba Ibaraki 305-0044 Japan Core Research for Evolutional Science & Technology(CREST) Japan Science and Technology Agency(JST) Kawaguchi Saitama 332-0012 Japan International Center for Materials Architectronics(WPI-MANA) National Institute for Materials Science(NIMS) Tsukuba Ibaraki 305-0044 Japan International Center for Materials Architectronics(WPI-MANA) National Institute for Materials Science(NIMS) Tsukuba Ibaraki 305-0044 Japan

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Stability of spontaneous polarization in ultrathin improper ferroelectrics

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Physical Review B 2011年第14期84卷 140101(R)-140101(R)页

作者： Zhigao Sheng Naoki Ogawa Yasushi Ogimoto Kenjiro Miyano Research Center for Advanced Science and Technology The University of Tokyo Komaba Meguro-ku Tokyo 153-8904 Japan Core Research for Evolutional Science & Technology (CREST) Japan Science and Technology Agency 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan Fuji Electric Company Limited Hino Tokyo 191-8502 Japan

The competition between the substrate-induced strain and the electrostatic polarization in improper ferroelectric films (hexagonal YMnO3) has been studied using optical second-harmonic generation techniques. Deposited on a (111) surface of yttria-stabilized zirconia substrate, the films exhibit (1) strong strain with negligible polarization, (2) relaxation accompanied by the nonlinear buildup of the polarization, and (3) bulklike polar behavior, in the order of increasing film thickness. The role of the substrate is distinctively different from that in proper ferroelectrics.

关键词： POLARIZATION (Electricity) FERROELECTRIC thin films ZIRCONIUM oxide THIN films ELECTROSTATICS

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Inside Cover: Organometallic Catalysts for Use in a Fuel Cell (ChemCatChem 6/2013)

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ChemCatChem 2013年第6期5卷 1214-1214页

作者： Dr. Takahiro Matsumoto Kyoungmok Kim Dr. Hidetaka Nakai Prof. Takashi Hibino Prof. Seiji Ogo International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) Kyushu University 744 Moto-oka Nishi-ku Fukuoka 819-0395 (Japan) Fax: (+81) 92-802-2823 Department of Chemistry and Biochemistry Graduate School of Engineering Kyushu University 744 Moto-oka Nishi-ku Fukuoka 819-0395 (Japan) Graduate School of Environmental Studies Nagoya University Furo-cho Chikusa-ku Nagoya 464-8601 (Japan) Takashi Hibino Graduate School of Environmental Studies Nagoya University Furo-cho Chikusa-ku Nagoya 464-8601 (Japan) Seiji Ogo International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) Kyushu University 744 Moto-oka Nishi-ku Fukuoka 819-0395 (Japan) Fax: (+81) 92-802-2823 Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Kawaguchi Center Building 4-1-8 Honcho Kawaguchi-shi Saitama 332-0012 (Japan)

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Polymer-Protected and Au-Containing Bi- and Trimetallic Nanoparticles as Novel Catalysts for Glucose Oxidation

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Macromolecular Symposia 2012年第1期317-318卷

作者： Naoki Toshima Haijun Zhang Department of Applied Chemistry Tokyo University of Science Yamaguchi SanyoOnoda Yamaguchi 756-0884 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) Kawaguchi Saitama 332-0012 Japan

Polymer-protected metal nanoparticles (NPs) are recognized as a type of complex between a polymer and metal NPs, since the metal NPs are stabilized by coordination to the polymer. Thus, they can work as an effective catalyst in a dispersed state due to their high surface area-to-volume ratio and high stability by protection with poly(N-vinyl-2-pyrrolidone) (PVP). In this study, colloidal dispersions of PVP-protected and Au-containing bi- and trimetallic NPs were prepared and applied to the catalyst for the aerobic oxidation of glucose into gluconic acid in an alkaline solution. The AuAg and AuPt bimetallic NPs were more active than the Au NPs although the Ag and Pt NPs were less active than the Au NPs. The AuAgPt (Au/Ag/Pt = 7/2/1) trimetallic NPs were the most active catalyst for the same reaction. The high activity can be explained by electronic charge transfer from the Ag or Pt to the Au.

关键词： Ag Au catalyst bimetallic nanoparticles gluconic acid glucose oxidation Pt trimetallic nanoparticles

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