Updated on 2025/03/19

写真a

 
Yoshihide Watanabe
 
Organization
Visiting Faculty Environmental Chemistry Laboratory Collaborative Visiting Professor   
Degree
博士(工学) ( 2005.9   東京大学 )
External link
Contact information
メールアドレス

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Catalyst and resource chemical process

  • Nanotechnology/Materials / Thin film/surface and interfacial physical properties

  • Environmental Science/Agriculture Science / Environmental load reduction and remediation  / 環境化学

  • Nanotechnology/Materials / Analytical chemistry

  • Nanotechnology/Materials / Nano/micro-systems

Main research papers

  • CO oxidation activity of non-reducible oxide-supported mass-selected few-atom Pt single-clusters

    A. Beniya, S. Higashi, N. Ohba, R. Jinnouchi, H. Hirata, Y. Watanabe

    Nature Communications   11(1)   1888   2020.4

    Synergistic Promotion of NO-CO Reaction Cycle by Gold and Nickel Elucidated using Well-Defined Model Bimetallic Catalyst Surface

    A. Beniya, Y. Ikuta, N. Isomura, H. Hirata, Y. Watanabe

    ACS Catalysis   7(2)   1369 - 1377   2017.1.6

    Portable ultrahigh-vacuum sample storage system for polarization-dependent total-reflection fluorescence X-ray absorption fine structure spectroscopy

    Y. Watanabe, Nishimura Yusaku F, Suzuki Ryo, Uehara Hiromitsu, Nimura Tomoyuki, Beniya Atsushi, Isomura Noritake, Asakura Kiyotaka, Takakusagi Satoru

    Journal of Vacuum Science & Technology A   34(2-2)   023201   2016

    Size-dependent catalytic activity and geometries of size-selected Pt clusters on TiO2(110) surfaces

    Y. Watanabe, X. Wu , H. Hirata, N. Isomura

    Catalysis Science & Technology   1(8)   1490   2011

    Multinuclear NMR Studies on the Thermal Stability of SAPO-34

    Y. Watanabe, A. Koiwai, H. Takeuchi, S.A. Hyodo, S. Noda

    Journal of Catalysis   143(2)   430   1993

Research History

  • Toyota Technological Institute   Collaborative Visiting Professor

    2019.9

  • 豊田中央研究所   -

    1987.4

Education

  • Osaka University

    1985.4 - 1987.3

      More details

    Country: Japan

  • Kyoto University   Faculty of Science

    1981.4 - 1985.3

      More details

    Country: Japan

Professional Memberships

  • CATALYSIS SOCIETY OF JAPAN

  • American Vacuum Society

  • Japanese Vacuum and Surface Science Society

  • The Chemical Society of Japan

Committee Memberships

  • 表面科学会中部支部   幹事(企画幹事)  

    2024.4   

      More details

    Committee type:Academic society

  • 日本表面真空学会   理事  

    2022.5 - 2024.5   

  • 日本表面真空学会   中部支部長  

    2022.4 - 2024.4   

      More details

    Committee type:Academic society

  • 日本表面真空学会   支部幹事・副支部長  

    2018.4 - 2022.3   

      More details

    Committee type:Academic society

  • 真空学会   東海支部役員  

    2015.9 - 2018.3   

      More details

    Committee type:Academic society

  • 日本表面真空学会   編集委員  

    2012.5   

      More details

    Committee type:Academic society

  • 表面科学会中部支部   幹事(企画幹事)  

    2012.4 - 2018.3   

      More details

    Committee type:Academic society

▼display all

Research theme

  • Phase transition and properties of environmental materials

    渡邊 佳英

    2017

     More details

    Phase transition and properties of environmental materials

    Outcome:

    2023
    The metal-insulator transition of individual VO2 nanoparticles was successfully observed. in collaboration with the Institute for Molecular Science.

  • Environmental catalyst system for green conversion utilizing flow reactors

    渡邊 佳英

    2017

     More details

    (1) Phase transition and properties of environmental materials
    (2) Environmental catalyst system for green conversion utilizing flow reactors


    Outcome:

    2023
    The application of flow reactors was considered. through FLOWST research group activities.

Papers

  • Atomically Precise Supported Metal Clusters: Catalysis and the Important Role of the Support. Invited Reviewed

    Yoshihide Watanabe

    触媒   66 ( 2 )   80 - 86   2024 (   ISSN:0559-8958 )

     More details

    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    Other Link: https://ndlsearch.ndl.go.jp/books/R000000004-I033463389

  • Metastability in the Insulator–Metal Transition for Individual Vanadium Dioxide Nanoparticles Invited Reviewed

    Kazutaka Nishikawa, Jun Nishida, Masamichi Yoshimura, Keiichi Nakamoto, Takashi Kumagai, Yoshihide Watanabe

    The Journal of Physical Chemistry C   127 ( 33 )   16485 - 16495   2023.8 (   ISSN:1932-7447   eISSN:1932-7455 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.jpcc.3c02151

  • Effect of surface modification by Ar+ion irradiation on thermal hysteresis of VO<inf>2</inf> Reviewed

    K. Nishikawa, S. Takakura, M. Nakatake, M. Yoshimura, Y. Watanabe

    Journal of Applied Physics   133 ( 4 )   2023.1 (   ISSN:0021-8979   eISSN:1089-7550 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    Vanadium dioxide (VO2) undergoes a metal-insulator phase transition at ∼70 °C. As this is a first-order phase transition, VO2 exhibits thermal hysteresis. The reflectivity and electrical resistivity of VO2 drastically change at insulator-to-metal (TIMT) and metal-to-insulator (TMIT) transition temperatures during heating and cooling, respectively. For smart glass and thermal memory applications employing VO2, the origin and control factor of thermal hysteresis must be investigated. Additional elemental doping and nano-structuring of VO2 affect the thermal hysteresis width. However, the factors determining TIMT and TMIT remain unclear. TIMT and TMIT can be modified by irradiating Ar+ on the surface of VO2 nanostructures with varying Ar+ irradiation doses (nAr+) at 1 keV. The temperature-dependent reflectivity against IR light is evaluated. For VO2, TIMT decreases with nAr+ = 3.9 × 1014 cm-2; TMIT increases with nAr+ > 3.9 × 1015 cm-2. Ar+ irradiation decreases the thermal hysteresis width. Because the expected penetration depth of Ar+ at 1 keV into the VO2 surface is <6 nm, the VO2 chemical state at the outermost surface is investigated using x-ray absorption spectroscopy with soft x-ray irradiation. The V L-edge peak energy decreases with increasing nAr+ . Ar+ irradiation reduces V only at the outermost surface state. TIMT is more sensitive than TMIT to the reduction of V. The reduction of only a small fraction at the surface affects the phase transition of the entire VO2. These results are beneficial for understanding the cause of thermal hysteresis width and improving the performance of devices using VO2.

    DOI: 10.1063/5.0132957

  • Phase transition behavior in nanostructured VO2 with M1, M2, and R phases observed via temperature-dependent XRD measurements Reviewed

    Kazutaka Nishikawa, Masamichi Yoshimura, Yoshihide Watanabe

    Journal of Vacuum Science & Technology A   40 ( 3 )   2022.5 (   ISSN:0734-2101   eISSN:1520-8559 )

     More details

    Authorship:Last author, Corresponding author   Publishing type:Research paper (scientific journal)  

    Vanadium dioxide (VO2) exhibits a metal-insulator phase transition at approximately 70 °C. Two different crystal structures, M1 and M2 phases, in the insulating state have been reported. The M2 phase is expected to be a Mott insulator, whereas the M1 phase is expected to act as a band insulator. It is important to clarify the origin and transition properties of the M2 phase. In this study, we fabricated VO2 nanostructures via sputtering deposition and subsequent lamp annealing at various O2 pressures. Temperature-dependent XRD measurements revealed that the nanostructured VO2 exhibits the M2 phase in temperatures just before the phase transition from M1 to R (metal state) during the heating process. The ratio of V5+/(V4+ + V5+) in nanostructured VO2 was estimated from XPS results; an increase in this ratio resulted in the broadening of the temperature range of the M2 phase. Furthermore, in the cooling process, direct phase transitions from R to M1 were observed. Structural changes are likely to occur in different pathways during heating and cooling. Our findings should contribute to the identification of the phase transition mechanism and to the development of a Mott field-effect transistor that utilizes nanostructured VO2 in the M2 phase.

    DOI: 10.1116/6.0001705

  • X-ray photoelectron spectroscopy study of Pt-cluster-induced electronic-state change of CeO2(111) surfaces Reviewed

    Syed Mohammad Fakruddin Shahed, Atsushi Beniya, Hirohito Hirata, Yoshihide Watanabe

    Journal of Vacuum Science & Technology A   40 ( 1 )   013204 - 013204   2022.1 (   ISSN:0734-2101   eISSN:1520-8559 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Vacuum Society  

    DOI: 10.1116/6.0001382

  • CO oxidation activity of non-reducible oxide-supported mass-selected few-atom Pt single-clusters. Reviewed

    Atsushi Beniya, Shougo Higashi, Nobuko Ohba, Ryosuke Jinnouchi, Hirohito Hirata, Yoshihide Watanabe

    Nature communications   11 ( 1 )   1888 - 1888   2020.4 (   ISSN:2041-1723 )

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    Platinum nanocatalysts play critical roles in CO oxidation, an important catalytic conversion process. As the catalyst size decreases, the influence of the support material on catalysis increases which can alter the chemical states of Pt atoms in contact with the support. Herein, we demonstrate that under-coordinated Pt atoms at the edges of the first cluster layer are rendered cationic by direct contact with the Al2O3 support, which affects the overall CO oxidation activity. The ratio of neutral to cationic Pt atoms in the Pt nanocluster is strongly correlated with the CO oxidation activity, but no correlation exists with the total surface area of surface-exposed Pt atoms. The low oxygen affinity of cationic Pt atoms explains this counterintuitive result. Using this relationship and our modified bond-additivity method, which only requires the catalyst-support bond energy as input, we successfully predict the CO oxidation activities of various sized Pt clusters on TiO2.

    DOI: 10.1038/s41467-020-15850-4

  • Electrochemical Observation of High Oxophilicity and its Effect on Oxygen Reduction Reaction Activity of Au Clusters Mass-Selectively Deposited on Glassy Carbon Reviewed

    Kensaku Kodama, Atsushi Beniya, Noritake Isomura, Yoshihide Watanabe

    Electrocatalysis   9 ( 4 )   471 - 479   2018.7 (   ISSN:1868-5994 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer New York LLC  

    The measurement procedure of oxophilicity and electrocatalytic activity for oxygen reduction reaction (ORR) on size-selected Au clusters was developed and applied. Mass-selected Au9 clusters were deposited on a glassy carbon substrate under ultrahigh vacuum (UHV) conditions, and the model electrode was transferred to an electrochemical cell with the rotating disk electrode (RDE) configuration. Cyclic voltammetry exhibited a significantly lower oxide-reduction peak potential of the Au clusters than that of bulk Au in the first cycle, thus confirming the exceptionally higher oxophilicities for the former. After performing cyclic voltammetry with an upper limit potential of 1.8 V versus a reversible hydrogen electrode, the ORR activity of the Au clusters was lower than that of bulk Au and bulk Pt. This result was partially ascribed to aggregations of Au clusters during the potential cycles. [Figure not available: see fulltext.].

    DOI: 10.1007/s12678-018-0464-4

  • Morphology of size-selected Ptn clusters on CeO2(111) Reviewed

    Syed Mohammad Fakruddin Shahed, Atsushi Beniya, Hirohito Hirata, Yoshihide Watanabe

    Journal of Chemical Physics   148 ( 11 )   114702 - 114709   2018.3 (   ISSN:0021-9606 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Institute of Physics Inc.  

    Supported Pt catalysts and ceria are well known for their application in automotive exhaust catalysts. Size-selected Pt clusters supported on a CeO2(111) surface exhibit distinct physical and chemical properties. We investigated the morphology of the size-selected Ptn (n = 5-13) clusters on a CeO2(111) surface using scanning tunneling microscopy at room temperature. Ptn clusters prefer a two-dimensional morphology for n = 5 and a three-dimensional (3D) morphology for n ≥ 6. We further observed the preference for a 3D tri-layer structure when n ≥ 10. For each cluster size, we quantitatively estimated the relative fraction of the clusters for each type of morphology. Size-dependent morphology of the Ptn clusters on the CeO2(111) surface was attributed to the Pt-Pt interaction in the cluster and the Pt-O interaction between the cluster and CeO2(111) surface. The results obtained herein provide a clear understanding of the size-dependent morphology of the Ptn clusters on a CeO2(111) surface.

    DOI: 10.1063/1.5017906

  • Synergistic Promotion of NO-CO Reaction Cycle by Gold and Nickel Elucidated using a Well-Defined Model Bimetallic Catalyst Surface Reviewed

    Atsushi Beniya, Yasuhiro Ikuta, Noritake Isomura, Hirohito Hirata, Yoshihide Watanabe

    ACS CATALYSIS   7 ( 2 )   1369 - 1377   2017.2 (   ISSN:2155-5435 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    A bimetallic catalyst of Au and Ni significantly increased the catalytic activity of the NO-CO reaction in comparison to monometallic Au and Ni catalysts. Unraveling the roles of Au and Ni atoms in the each of the NO-CO reaction steps occurring on the Au-Ni catalyst surface is crucial to reveal the origin of the increased activity. For this purpose, a well-defined Au/Ni(111) model catalyst was prepared, on which CO and NO adsorption, their coadsorption, NO dissociation, CO2 formation, and N-2 formation were investigated using infrared reflection absorption spectroscopy, temperature-programmed desorption/reaction, and density functional theory calculations. In the reaction process, the catalyst surface would be dominantly covered by N and O atoms, which would be removed from the surface by N-2 formation and CO2 formation. O atoms preferentially occupy the Ni hollow sites by segregating N atoms to the adsorption sites made up of Au and Ni atoms. Thus, only the N-2 formation step was affected by the Au atoms. The activation energy for the N-2 formation step, which was assigned as a rate-limiting step, was significantly lowered by the Au atoms, and this effect will contribute to the decrease of the activation energy of the overall NO-CO reaction. These results suggest that, by utilizing the adsorption site preferences among the coadsorbates on the bimetallic surface, the activation energy of a rate-limiting step would be significantly decreased; this could be useful in the development of advanced NOx reduction catalysts.

    DOI: 10.1021/acscatal.6b02714

  • Portable ultrahigh-vacuum sample storage system for polarization-dependent total-reflection fluorescence x-ray absorption fine structure spectroscopy Reviewed

    Yoshihide Watanabe, Yusaku F. Nishimura, Ryo Suzuki, Hiromitsu Uehara, Tomoyuki Nimura, Atsushi Beniya, Noritake Isomura, Kiyotaka Asakura, Satoru Takakusagi

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   34 ( 2 )   023201 - 023205   2016.3 (   ISSN:0734-2101   eISSN:1520-8559 )

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:A V S AMER INST PHYSICS  

    A portable ultrahigh-vacuum sample storage system was designed and built to investigate the detailed geometric structures of mass-selected metal clusters on oxide substrates by polarization-dependent total-reflection fluorescence x-ray absorption fine structure spectroscopy (PTRF-XAFS). This ultrahigh-vacuum (UHV) sample storage system provides the handover of samples between two different sample manipulating systems. The sample storage system is adaptable for public transportation, facilitating experiments using air-sensitive samples in synchrotron radiation or other quantum beam facilities. The samples were transferred by the developed portable UHV transfer system via a public transportation at a distance over 400 km. The performance of the transfer system was demonstrated by a successful PTRF-XAFS study of Pt-4 clusters deposited on a TiO2(110) surface. (C) 2015 American Vacuum Society.

    DOI: 10.1116/1.4936344

  • Atomically precise cluster catalysis towards quantum controlled catalysts Invited Reviewed

    Yoshihide Watanabe

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   15 ( 6 )   WEB ONLY 063501   2014.12 (   ISSN:1468-6996 )

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATL INST MATERIALS SCIENCE  

    Catalysis of atomically precise clusters supported on a substrate is reviewed in relation to the type of reactions. The catalytic activity of supported clusters has generally been discussed in terms of electronic structure. Several lines of evidence have indicated that the electronic structure of clusters and the geometry of clusters on a support, including the accompanying clustersupport interaction, are strongly correlated with catalytic activity. The electronic states of small clusters would be easily affected by cluster-support interactions. Several studies have suggested that it is possible to tune the electronic structure through atomic control of the cluster size. It is promising to tune not only the number of cluster atoms, but also the hybridization between the electronic states of the adsorbed reactant molecules and clusters in order to realize a quantumcontrolled catalyst.

    DOI: 10.1088/1468-6996/15/6/063501

  • Morphology and chemical states of size-selected Pt-n clusters on an aluminium oxide film on NiAl(110) Reviewed

    Atsushi Beniya, Noritake Isomura, Hirohito Hirata, Yoshihide Watanabe

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   16 ( 48 )   26485 - 26492   2014 (   ISSN:1463-9076   eISSN:1463-9084 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    The adsorption states of size-selected Pt-n clusters (7 &lt;= n &lt;= 20) soft-landed on an Al2O3/NiAl(110) substrate were investigated using scanning tunneling microscopy, infrared reflection absorption spectroscopy, and temperature programmed desorption. Pt-n clusters lay flat on the surface with a planar structure (n &lt;= 18), and three-dimensional two-layer clusters start to appear at n &gt;= 19. By considering the Pt-Pt and Pt-oxide bonds in the cluster, the morphological transition could be reasonably explained. Using CO probe molecules, the chemical states of the Pt atoms inside the clusters were investigated. Two ontop CO species were observed inside the clusters, and were assigned as adsorbed CO on neutral and slightly cationic Pt atoms. Despite the first layer Pt atoms, the Pt-n clusters are composed of two kinds of Pt atoms. The observed size dependence of the Pt atoms inside the clusters may contribute to the size-dependent chemical reactivity of Pt-n clusters on the Al2O3 surface.

    DOI: 10.1039/c4cp01767f

  • Size-dependent catalytic activity and geometries of size-selected Pt clusters on TiO2(110) surfaces Reviewed

    Yoshihide Watanabe, Xingyang Wu, Hirohito Hirata, Noritake Isomura

    CATALYSIS SCIENCE & TECHNOLOGY   1 ( 8 )   1490 - 1495   2011 (   ISSN:2044-4753   eISSN:2044-4761 )

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Scanning tunneling microscope observations show a geometrical transition from a planar structure to a 3D structure at n = 8. This geometrical transition resulted in a significant decrease in the activation energy of the CO oxidation reaction. The upper-layer Pt atoms of the 3D cluster structure that starts to form at n = 8 are low-coordinated Pt atoms, and they may play an important role in the CO oxidation reaction.

    DOI: 10.1039/c1cy00204j

  • Development of a model for the lean NOx catalytic reaction with hydrocarbon adsorption and desorption Reviewed

    Y Watanabe, A Asano, T Kondo, Y Sakakibara, M Sugiura

    APPLIED CATALYSIS B-ENVIRONMENTAL   31 ( 3 )   221 - 228   2001.5 (   ISSN:0926-3373 )

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A numerical model for lean NOx catalytic reaction in consideration of hydrocarbon adsorption and desorption process, which is capable of predicting the performance of diesel lean NOx catalyst using diesel fuel as a supplemental reductant, has been developed. This model is based on our simplified kinetics for the adsorption and desorption of hydrocarbons, for the oxidation of hydrocarbons, and for the reduction of NOx by hydrocarbons including the desorbed one. The adsorption of diesel exhaust hydrocarbons was expressed by the Freundlich-type isotherm that has the adsorption equilibrium constant of exponential temperature dependence. The behavior of HC and NOx reactions and HC adsorption and desorption in diesel exhaust has been simulated successfully. (C) 2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0926-3373(00)00282-4

  • MULTINUCLEAR NMR-STUDIES ON THE THERMAL-STABILITY OF SAPO-34 Reviewed

    Y WATANABE, A KOIWAI, H TAKEUCHI, SA HYODO, S NODA

    JOURNAL OF CATALYSIS   143 ( 2 )   430 - 436   1993.10 (   ISSN:0021-9517 )

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS  

    DOI: 10.1006/jcat.1993.1287

  • AlveoMPU: Bridging the Gap in Lung Model Interactions Using a Novel Alveolar Bilayer Film Reviewed

    Minoru Hirano, Kosuke Iwata, Yuri Yamada, Yasuhiko Shinoda, Masateru Yamazaki, Sayaka Hino, Aya Ikeda, Akiko Shimizu, Shuhei Otsuka, Hiroyuki Nakagawa, Yoshihide Watanabe

    Polymers   16 ( 11 )   1486 - 1486   2024.5 (     eISSN:2073-4360 )

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    The alveoli, critical sites for gas exchange in the lungs, comprise alveolar epithelial cells and pulmonary capillary endothelial cells. Traditional experimental models rely on porous polyethylene terephthalate or polycarbonate membranes, which restrict direct cell-to-cell contact. To address this limitation, we developed AlveoMPU, a new foam-based mortar-like polyurethane-formed alveolar model that facilitates direct cell–cell interactions. AlveoMPU features a unique anisotropic mortar-shaped configuration with larger pores at the top and smaller pores at the bottom, allowing the alveolar epithelial cells to gradually extend toward the bottom. The underside of the film is remarkably thin, enabling seeded pulmonary microvascular endothelial cells to interact with alveolar epithelial cells. Using AlveoMPU, it is possible to construct a bilayer structure mimicking the alveoli, potentially serving as a model that accurately simulates the actual alveoli. This innovative model can be utilized as a drug-screening tool for measuring transepithelial electrical resistance, assessing substance permeability, observing cytokine secretion during inflammation, and evaluating drug efficacy and pharmacokinetics.

    DOI: 10.3390/polym16111486

  • Phase transition behavior in nanostructured VO2 with M1, M2, and R phases observed via temperature-dependent XRD measurements Reviewed

    Kazutaka Nishikawa*, Masamichi Yoshimura, 渡邊 佳英

    Journal of Vacuum Science & Technology   40 ( 3 )   33401   2023.2

     More details

    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:AIP publishing  

  • Effect of surface modification by Ar+ ion irradiation on thermal hysteresis of VO2 Reviewed

    K. Nishikawa ; S. Takakura; M. Nakatake; M. Yoshimura; Y. Watanabe

    ( 133 )   045305   2023.1

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1063/5.0132957

  • Insight for Designing Mass-Efficient Metal-Oxide-Supported Heterogeneous Catalyst from the Identification of the Catalytically Active Edge Sites Using Isotopically Labeled 13CO and 18O2 Reviewed

    Atsushi Beniya, Kazutoshi Miwa, Hirohito Hirata, Yoshihide Watanabe, Shougo Higashi

    ACS Catalysis   12 ( 3 )   1977 - 1985   2022.1 (   ISSN:2155-5435 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society ({ACS})  

    Identifying the catalytically active sites and determining the reaction pathways on metal-oxide-supported few-atom clusters are of great importance for realizing mass-efficient heterogeneous catalysts. However, thermodynamics-based kinetic analyses, which are usually employed to elucidate such reaction mechanisms, can lead to contradictory conclusions even for simple catalytic systems such as CO oxidation. For CO oxidation on TiO2, a typical reducible oxide, the reaction is considered to proceed using the lattice O in the oxide. However, using isotopically labeled (CO)-C-13 and O-18(2), we herein show that only similar to 20% of the total CO2 is produced with the lattice O from TiO2; instead, most of the obtained CO2 is produced by O atoms from the introduced O-2 gas adsorbed on Pt atoms in the size-specific Pt clusters deposited on TiO2. We also show that both the introduced O-2 and lattice O react with CO adsorbed on hexa-coordinated Pt atoms at the edge of the Pt nanoclusters, suggesting that an edge structure that maximizes the coordination number of the edge Pt atoms could exhibit an improved catalytic activity.

    DOI: 10.1021/acscatal.1c03948

  • Growth of nanostructured VO2 via controlling oxidation of V thin films: Morphology and phase transition properties Reviewed

    Kazutaka Nishikawa*, Masamichi Yoshimura, 渡邊 佳英

    Journal of Applied Physics   129 ( 18 )   185303   2021.5

     More details

    Authorship:Last author   Publishing type:Research paper (scientific journal)  

  • Growth of nanostructured VO2 via controlling oxidation of V thin films: Morphology and phase transition properties Reviewed

    K. Nishikawa, M. Yoshimura, Y. Watanabe

    Journal of Applied Physics   129 ( 18 )   185303 - 185303   2021.5 (   ISSN:0021-8979   eISSN:1089-7550 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    Vanadium dioxide (VO2), which exhibits a metal-insulator phase transition at 70 °C, is known to alter its physical properties according to its surface morphology and fabrication process. The systematic investigation of a new fabrication method could not only clarify the origin of its phase transition but also advance progress in applications employing VO2 nanostructures. Here, we demonstrate the drastic enhancement of both the surface morphology and hysteresis of VO2 nanostructures composed of nanoparticles, by applying a sputtering deposition fabrication process, followed by lamp annealing. We investigated different growth conditions for VO2, especially using metallic precursor oxidation under a controlled pressure and temperature, and found that each growth condition led to different morphologies, nanoparticle sizes, and phase transition properties (hysteresis width). Despite a slight increase in particle diameter with annealing time and O2 pressure, the particle aggregation was found to substantially decrease. The temperature width of the hysteresis loop obtained by infrared light reflection measurements increased as the aggregation of VO2 nanoparticles decreased. During the cooling procedure, the transition of slightly aggregated VO2 nanoparticles was revealed to be a two-step process, with the lower transition temperature decreasing with an increase in particle isolation. Our results have the potential to elucidate the hysteresis-inducing mechanisms in VO2 and to aid the materialization of novel devices such as passive thermal control and thermal memory devices.

    DOI: 10.1063/5.0047985

  • Model reactions over size-selected clusters on oxide surfaces Reviewed

    Watanabe, Y.

    Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry   2018

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/B978-0-12-409547-2.12995-6

  • Catalysis of pt clusters on metal oxide Reviewed

    Watanabe, Y.

    Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry   2018

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/B978-0-12-409547-2.12983-X

  • Alumina-supported sub-nanometer Pt-10 clusters: amorphization and role of the support material in a highly active CO oxidation catalyst Reviewed

    Chunrong Yin, Fabio R. Negreiros, Giovanni Barcaro, Atsushi Beniya, Luca Sementa, Eric C. Tyo, Stephan Bartling, Karl-Heinz Meiwes-Broer, Sonke Seifert, Hirohito Hirata, Noritake Isomura, Sandeep Nigam, Chiranjib Majumder, Yoshihide Watanabe, Alessandro Fortunelli, Stefan Vajda

    JOURNAL OF MATERIALS CHEMISTRY A   5 ( 10 )   4923 - 4931   2017.3 (   ISSN:2050-7488   eISSN:2050-7496 )

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ROYAL SOC CHEMISTRY  

    Catalytic CO oxidation is unveiled on size-selected Pt-10 clusters deposited on two very different ultrathin (approximate to 0.5-0.7 nm thick) alumina films: (i) a highly ordered alumina obtained under ultra-high vacuum (UHV) by oxidation of the NiAl(110) surface and (ii) amorphous alumina obtained by atomic layer deposition (ALD) on a silicon chip that is a close model of real-world supports. Notably, when exposed to realistic reaction conditions, the Pt-10/UHV-alumina system undergoes a morphological transition in both the clusters and the substrate, and becomes closely akin to Pt-10/ALD-alumina, thus reconciling UHV-type surface-science and real-world experiments. The Pt-10 clusters, thoroughly characterized via combined experimental techniques and theoretical analysis, exhibit among the highest CO oxidation activity per Pt atom reported for CO oxidation catalysts, due to the interplay of ultra-small size and support effects. A coherent interdisciplinary picture then emerges for this catalytic system.

    DOI: 10.1039/c6ta10989f

  • PTRF-XAFS Study of Size-Selected Pt7 Cluster Uniformly Deposited on an Al2O3/NiAl(110) Substrate by Lissajour Scanning

    NISHIMURA Yusaku F, BENIYA Atsushi, SUZUKI Ryo, ASAKURA Kiyotaka, TAKAKUSAGI Satoru, WATANABE Yoshihide

    KEK Progress Report (Web)   ( 2016-8 )   ROMBUNNO.144 (WEB ONLY)   2017.1 (   ISSN:1344-6320 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  • Significant Transient Mobility of Platinum Clusters via a Hot Precursor State on the Alumina Surface Reviewed

    Atsushi Beniya, Hirohito Hirata, Yoshihide Watanabe

    JOURNAL OF PHYSICAL CHEMISTRY LETTERS   7 ( 22 )   4710 - 4715   2016.11 (   ISSN:1948-7185 )

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Relaxation dynamics of hot metal clusters on oxide surfaces play a crucial role in a variety of physical and chemical processes. However, their transient mobility has not been investigated as much as other systems such as atoms and molecules on metal surfaces due to experimental difficulties. To study the role of the transient mobility of dusters on the oxide surface, we investigated the initial adsorption process of size-selected Pt clusters on a thin Al2O3 film. Soft-landing the size-selected clusters while suppressing the thermal migration resulted in the transient migration controlling the initial adsorption states as an isolated and aggregated duster, as revealed using scanning tunneling microscopy. We demonstrate that transient migration significantly contributes to the initial cluster adsorption process; the cross section for aggregation is seven times larger than the expected value from geometrical considerations, indicating that metal clusters are highly mobile during a energy dissipation process on the oxide surface.

    DOI: 10.1021/acs.jpclett.6b02362

  • Uniform deposition of size-selected clusters using Lissajous scanning Reviewed

    Beniya, Atsushi, Hirata, Hirohito, Watanabe, Yoshihide

    Journal of Vacuum Science & Technology A   34 ( 3 )   031601 - 031601   2016 (   ISSN:0734-2101   eISSN:1520-8559 )

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:A V S AMER INST PHYSICS  

    Size-selected clusters can be deposited on the surface using size-selected cluster ion beams. However, because of the cross-sectional intensity distribution of the ion beam, it is difficult to define the coverage of the deposited clusters. The aggregation probability of the cluster depends on coverage, whereas cluster size on the surface depends on the position, despite the size-selected clusters are deposited. It is crucial, therefore, to deposit clusters uniformly on the surface. In this study, size-selected clusters were deposited uniformly on surfaces by scanning the cluster ions in the form of Lissajous pattern. Two sets of deflector electrodes set in orthogonal directions were placed in front of the sample surface. Triangular waves were applied to the electrodes with an irrational frequency ratio to ensure that the ion trajectory filled the sample surface. The advantages of this method are simplicity and low cost of setup compared with raster scanning method. The authors further investigated CO adsorption on size-selected Pt-n(n = 7, 15, 20) clusters uniformly deposited on the Al2O3/NiAl(110) surface and demonstrated the importance of uniform deposition. (C) 2016 American Vacuum Society.

    DOI: 10.1116/1.4944051

  • RHEED patterns calculated for Pt nano clusters on TiO&lt;inf&gt;2&lt;/inf&gt;(110) substrate Reviewed

    Yoshimi Horio, Yoshihide Watanabe, Yuji Takakuwa, Shuichi Ogawa

    e-Journal of Surface Science and Nanotechnology   13   125 - 128   2015 (   ISSN:1348-0391 )

     More details

    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Surface Science Society of Japan  

    Platinum nano clusters, which are attractive material for highly activated catalysis, are usually evaluated by scanning tunneling microscopy (STM). Here we challenge to evaluate the structure of Pt nano clusters by reflection high-energy electron diffraction (RHEED) for the first time. The nano cluster models are made of n = 7 and n = 15 Pt atoms, which are deposited on TiO2 (110) substrate. The former has two dimensional (planer) and the latter three dimensional (two layer's) shapes. They are rotated around their [111] axes of Pt crystal, whose axes are also inclined from the substrate surface normal because of the atomically rough substrate surface. The RHEED patterns have been calculated by kinematic diffraction theory. From the calculated patterns for the two types of the clusters (n = 7 and 15), it is found that there is characteristic difference in the radial intensity distributions. The difference is attributed to existence or absence of the higher order reflections which arise from two layers of Pt(111).

    DOI: 10.1380/ejssnt.2015.125

  • STM and XPS study of CeO2(111) reduction by atomic hydrogen Reviewed

    Syed Mohammad Fakruddin Shahed, Tomo Hasegawa, Yasuyuki Sainoo, Yoshihide Watanabe, Noritake Isomura, Atsushi Beniya, Hirohito Hirata, Tadahiro Komeda

    SURFACE SCIENCE   628   30 - 35   2014.10 (   ISSN:0039-6028   eISSN:1879-2758 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Reduction of CeO2(111)/Ru(0001) surface by atomic hydrogen was investigated using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). We observed the formation of oxygen vacancy trimers and hydroxyl trimers on the stoichiometric CeO2(111) surface when it was exposed to atomic hydrogen at room temperature. The reaction of an impinging hydrogen atom with a surface oxygen atom yields a hydroxyl species, which diffuse on the surface until stabilized by the formation of OH trimers. The hydrogen atoms were located at atop sites of the oxygen atoms in the topmost surface layer. A reaction between the hopping hydrogen atom and the hydroxyl species yields a water molecule, which is desorbed from the surface leaving an oxygen defect. The oxygen vacancies were also observed as a trimer of vacancies. XPS measurements showed an increase of a reduced Ce and hydroxyl species with an amount of exposed hydrogen atoms. The former was estimated by measuring the ratio of Ce3+/Ce4+ in the Ce 3d components. Our study shows the formation of hydroxyl trimer species in atomic scale upon atomic hydrogen exposure to CeO2(111) surface which could offer new catalytic activity. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.susc.2014.05.008

  • Epitaxial growth of CeO2(111) film on Ru(0001): Scanning tunneling microscopy (STM) and x-ray photoemission spectroscopy (XPS) study Reviewed

    Tomo Hasegawa, Syed Mohammad Fakruddin Shahed, Yasuyuki Sainoo, Atsushi Beniya, Noritake Isomura, Yoshihide Watanabe, Tadahiro Komeda

    JOURNAL OF CHEMICAL PHYSICS   140 ( 4 )   044711-044711-6   2014.1 (   ISSN:0021-9606   eISSN:1089-7690 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    We formed an epitaxial film of CeO2(111) by sublimating Ce atoms on Ru(0001) surface kept at elevated temperature in an oxygen ambient. X-ray photoemission spectroscopy measurement revealed a decrease of Ce4+/Ce3+ ratio in a small temperature window of the growth temperature between 1070 and 1096 K, which corresponds to the reduction of the CeO2(111). Scanning tunneling microscope image showed that a film with a wide terrace and a sharp step edge was obtained when the film was grown at the temperatures close to the reduction temperature, and the terrace width observed on the sample grown at 1060 K was more than twice of that grown at 1040 K. On the surface grown above the reduction temperature, the surface with a wide terrace and a sharp step was confirmed, but small dots were also seen in the terrace part, which are considerably Ce atoms adsorbed at the oxygen vacancies on the reduced surface. This experiment demonstrated that it is required to use the substrate temperature close to the reduction temperature to obtain CeO2(111) with wide terrace width and sharp step edges. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

    DOI: 10.1063/1.4849595

  • Displacement reaction of CO by NO on the Ni(111) surface Reviewed

    Atsushi Beniya, Noritake Isomura, Hirohito Hirata, Yoshihide Watanabe

    SURFACE SCIENCE   613   28 - 34   2013.7 (   ISSN:0039-6028   eISSN:1879-2758 )

     More details

    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Co-adsorption states and thermal stability of NO + CO on Ni(111) were investigated using infrared reflection absorption spectroscopy and temperature programed desorption. The mechanism for the displacement of CO by NO was clarified. Co-adsorbed NO induced hollow-to-ontop site-conversion of CO; NO molecules occupied hollow sites. Ontop and two hollow CO species were observed in the co-adsorbed phase. The ontop and lower frequency hollow CO were assigned to CO neighboring hollow NO; higher frequency hollow CO were assigned to CO forming those domain. The hollow-to-ontop site-conversion of CO occurred due to local interactions between CO and NO, which destabilized the CO by 0.5 eV. This destabilization afforded facile displacement of CO by NO at 300 K. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.susc.2013.03.001

  • Lateral displacement in soft-landing process and electronic properties of size-selected Pt-7 clusters on the aluminum oxide film on NiAl(110) Reviewed

    Atsushi Beniya, Noritake Isomura, Hirohito Hirata, Yoshihide Watanabe

    CHEMICAL PHYSICS LETTERS   576   49 - 54   2013.6 (   ISSN:0009-2614   eISSN:1873-4448 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Adsorption states of size-selected Pt7 clusters soft-landed on an Al2O3/NiAl(1 1 0) were investigated using scanning tunneling microscopy and spectroscopy at 300 K. Pt-7 clusters lay flat on the surface with a planar structure and were preferentially adsorbed on domain boundaries (DBs) of the Al2O3 film. Because the clusters are thermally immobile, adsorption to DBs is controlled by transient mobility on the surface. The mean lateral displacement by transient migration is estimated to be similar to 8 nm. Distinct conductivity resonances through unoccupied states of the Pt7 clusters were observed near 2 V. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2013.05.033

  • Low temperature adsorption and site-conversion process of CO on the Ni(111) surface Reviewed

    Atsushi Beniya, Noritake Isomura, Hirohito Hirata, Yoshihide Watanabe

    SURFACE SCIENCE   606 ( 23-24 )   1830 - 1836   2012.12 (   ISSN:0039-6028 )

     More details

    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Low-temperature (25 K) adsorption states and the site conversion of adsorbed CO between the ontop and the hollow sites on Ni(111) were studied by means of temperature programmed desorption and infrared reflection absorption spectroscopy. The activation energy and pre-exponential factor of desorption were estimated to be 1.2 eV and 2.6x10(13) s(-1), respectively, in the limit of zero coverage. At low coverage, CO molecules preferentially adsorbed at the hollow sites below 100 K. With increasing temperature, the ontop sites were also occupied. Using a van't Hoff plot, the enthalpy and the entropy differences between the hollow and ontop CO were estimated to be 36 meV and 0.043 meV K-1, respectively, and the vibrational entropy difference was estimated to be 0.085 meV K-1. The positive entropy difference was the result of the low-energy frustrated translational mode of the ontop CO, which was estimated to be 4.6 +/- 03 meV. With the harmonic approximation, the upper limit of the activation energy of site hopping from ontop sites to hollow sites was estimated to be 61 meV. In addition, it was suggested that the activation energy of hollow-to-hollow site hopping via a bridge site was less than 37 meV. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.susc.2012.07.026

  • Atomic-level Analysis and Catalytic Activity of Size-selected Pt Clusters Deposited on TiO2(110)

    Watanabe, Yoshihide, Isomura, Noritake, Hirata, Hirohito, Wu, Xingyang

    R&D Review of Toyota CRDL   42 ( 1 )   WEB ONLY 51-62   2011.3 (   ISSN:1347-9652 )

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  • Cluster size dependence of Pt core-level shifts for mass-selected Pt clusters on TiO2(110) surfaces Reviewed

    Noritake Isomura, Xingyang Wu, Hirohito Hirata, Yoshihide Watanabe

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   28 ( 5 )   1141 - 1144   2010.9 (   ISSN:0734-2101 )

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:A V S AMER INST PHYSICS  

    In order to examine cluster size dependence, mass-selected platinum clusters, Pt-n (n=2-5, 7, 8, 10, 15), were deposited on TiO2(110) surfaces at room temperature under soft landing conditions, and their core levels were investigated by x-ray photoelectron spectroscopy. Pt core-level shifts with cluster size are observed. The binding energies of Pt 4f(7/2) decrease steeply with increasing cluster size up to n=7 for Pt-n and decrease gradually for n &gt;= 8. This inflection point (n=8) agrees well with the cluster size at a geometric transition (planar-to-three-dimensional) seen with scanning tunneling microscopy (STM) [N. Isomura, X. Wu, and Y. Watanabe, J. Chem. Phys. 131, 164707 (2009)]. It was found that the core-level shifts of mass-selected Pt clusters deposited on TiO2 are closely correlated with cluster geometries determined directly by atomic-resolution STM imaging. (C) 2010 American Vacuum Society. [DOI: 10.1116/1.3467033]

    DOI: 10.1116/1.3467033

  • Atomic-resolution imaging of size-selected platinum clusters on TiO2(110) surfaces Reviewed

    Noritake Isomura, Xingyang Wu, Yoshihide Watanabe

    JOURNAL OF CHEMICAL PHYSICS   131 ( 16 )   164707   2009.10 (   ISSN:0021-9606   eISSN:1089-7690 )

     More details

    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    Size-selected Pt-n (n=4, 7-10, 15) clusters were deposited on TiO2(110)-(1 x 1) surfaces and imaged at atomic resolution using an ultrahigh-vacuum scanning tunneling microscope with a carbon nanotube tip. Clusters smaller than Pt-7 lay flat on the surface with a planar structure and a planar-to-three-dimensional transition occurred at n=8 for Pt-n clusters on TiO2. However, both Pt-8 and Pt-9 had two types of geometric structures. The geometric structures depend strongly on the number of atoms in the deposited cluster possibly because of the differences in binding energies in different-sized clusters and different degrees of interaction with the surface. We obtained atomic-resolution images of size-selected clusters on surfaces for the first time, enabling the identification of atomic alignments in the clusters on the surface. (C) 2009 American Institute of Physics. [doi:10.1063/1.3251786]

    DOI: 10.1063/1.3251786

  • A new experimental setup for high-pressure catalytic activity measurements on surface deposited mass-selected Pt clusters Reviewed

    Yoshihide Watanabe, Noritake Isomura

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A   27 ( 5 )   1153 - 1158   2009.9 (   ISSN:0734-2101   eISSN:1520-8559 )

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:A V S AMER INST PHYSICS  

    A new experimental setup to study catalytic and electronic properties of size-selected clusters on metal oxide substrates from the viewpoint of cluster-support interaction and to formulate a method for the development of heterogeneous catalysts such as automotive exhaust catalysts has been developed. The apparatus consists of a size-selected cluster source, a photoemission spectrometer, a scanning tunneling microscope (STM), and a high-pressure reaction cell. The high-pressure reaction cell measurements provided information on catalytic properties in conditions close to practical use. The authors investigated size-selected platinum clusters deposited on a TiO(2)(110) surface using a reaction cell and STM. Catalytic activity measurements showed that the catalytic activities have a cluster-size dependency.

    DOI: 10.1116/1.3179160

  • STM Study of Size-Selected Pt Clusters on TiO2(110) Surface Reviewed

    Watanabe, Yoshihide, Isomura, Noritake, Yoshimura, Masamichi

    GRI Symposium II on Cluster Science   2009

     More details

    Publishing type:Research paper (scientific journal)  

  • Catalytic Properties of Mass-Selected Pt Clusters on TiO2(110) Surface Reviewed

    Isomura, Noritake, Watanabe, Yoshihide, Wu, Xingyang

    5th International Symposium on Surface and Nanotechnology(ISSS-5)   2008

     More details

    Publishing type:Research paper (scientific journal)  

  • Reactions of nitrogen monoxide on cobalt cluster ions: Reaction enhancement by introduction of hydrogen Reviewed

    Tetsu Hanmura, Masahiko Ichihashi, Yoshihide Watanabe, Noritake Isomura, Tamotsu Kondow

    JOURNAL OF PHYSICAL CHEMISTRY A   111 ( 3 )   422 - 428   2007.1 (   ISSN:1089-5639 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER CHEMICAL SOC  

    Absolute cross sections for NO chemisorption, NO decomposition, and cluster dissociation in the collision of a nitrogen monoxide molecule, NO, with cluster ions Co-n(+) and ConH+ (n = 2-5) were measured as a function of the cluster size, n, in a beam-gas geometry in a tandem mass spectrometer. Size dependency of the cross sections and the change of the cross sections by introduction of H to Co-n(+) (effect of H-introduction) are explained by a statistical model based on the RRK theory, with the aid of the energetics obtained by a DFT calculation. It was found that the reactions are governed by the energetics rather than dynamics. For instance, Co-3(+) does not react appreciably with NO because the reactions are endothermic, while Co3H+ does because the reaction becomes exothermic by the H-introduction.

    DOI: 10.1021/jp063273a

  • Catalytic Properties of Size-Selected Pt Clusters on TiO2(110) Surface Reviewed

    Watanabe, Yoshihide, Isomura, Noritake, Matsubara, Hiroyuki

    Symposium on Size Selected Clasters 2007   2007

     More details

    Publishing type:Research paper (scientific journal)  

  • STM Study of Size-Selected Pt Clusters on TiO2(110) Surface Reviewed

    Watanabe, Yoshihide, Isomura, Noritake, Yoshimura, Masamichi

    15th International Colloquium on Scanning Probe Microscopy   2007

     More details

    Publishing type:Research paper (scientific journal)  

  • A new optimizing technique of a diesel engine aftertreatment system using HC DeNo(x) catalyst Reviewed

    M Ueda, A Asano, T Kondo, Y Watanabe, T Fukuma, Y Harada

    JSAE REVIEW   24 ( 1 )   47 - 51   2003.1 (   ISSN:0389-4304 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    A new method that optimizes a control map of hydrocarbon (HC) addition to diesel exhaust gas for HC type Selective Catalytic Reduction DeNO(x) catalyst system has been developed. This method comprises a numerical model and a new optimization technique. The numerical model is capable of predicting performance of HC DeNO(x) with diesel fuel as a supplemental reductant. The control map of HC addition was optimized with the evolutionary programming based on the evolution of living things. As a result, NOx conversion with the optimized control map was found to be greater by 21% than that with the conventional control on Japanese 10-15 mode. (C) 2003 Society of Automotive Engineers of Japan, Inc. and Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0389-4304(02)00249-7

  • Optimization of diesel engine aftertreatment system with a model of hydrocarbon selective catalyst reduction (HC-SCR) and evolutionary programming Reviewed

    Ueda, M., Asano, A., Kondo, T., Watanabe, Y., Fukuma, T., Harada, Y.

    SAE Technical Papers   2002

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.4271/2002-01-0954

  • Numerical analysis of hydrocarbon adsorption and desorption behavior on NOx selective reduction catalysts using supplemental hydrocarbon under diesel transient condition Reviewed

    Watanabe, Y., Ueda, M., Sugiura, M., Harada, Y.

    SAE Technical Papers   2002

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.4271/2002-01-0953

  • Time-resolved time-of-flight mass spectrometry with molecular-pulse-probes for analysis of dynamic process in surface catalytic reactions in the millisecond range (I) Reviewed

    T Motohiro, Y Kizaki, Y Sakamoto, K Higuchi, Y Watanabe, S Noda

    APPLIED SURFACE SCIENCE   121   319 - 322   1997.11 (   ISSN:0169-4332 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Possible future developments of new automobile catalysts undoubtedly utilize transient phenomena at the change of gas composition under the cooperative functions of the catalytic components: noble metal particles, supports and third additives including 'migration' of adsorbed species and their temporal 'storage'. To explore highly cooperative he ts of the catalytic components, a new tool to detect transient products from artificially designed small area samples in the ms range was developed, which is more robust and tolerant for dynamic changes of vacuum conditions than the conventional UHV surface science tools. (C) 1997 Elsevier Science B.V.

    DOI: 10.1016/S0169-4332(97)00315-2

  • CATALYTIC PROPERTIES OF THIN-FILMS BY SIMULTANEOUS OBLIQUE SPUTTER-DEPOSITION OF 2 MATERIALS FROM DIFFERENT DIRECTIONS Reviewed

    Y WATANABE, S HYODO, T MOTOHIRO, T HIOKI, M SUGIURA, S NODA

    THIN SOLID FILMS   256 ( 1-2 )   68 - 72   1995.2 (   ISSN:0040-6090 )

     More details

    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    Catalytic properties of simultaneously obliquely sputter-deposited platinum-metal oxide thin films were studied. We attempted to study the effect of combination of the metal oxide with platinum on the NO-CO reaction by minimizing differences in the particle size and the dispersion of platinum in the samples. Simultaneously obliquely sputter-deposited Pt-metal oxide thin film systems gave comparable particle sizes and dispersion of platinum in different combinations of several metal oxides with platinum. The catalytic property of platinum was changed by the choice of metal oxide. We found this simultaneous oblique sputter deposition to be an excellent technique for obtaining a model catalyst suitable for exploring the synergistic catalytic reaction and the role of promoters at the interfaces of different materials, which facilitates the survey of industrial catalysts.

    DOI: 10.1016/0040-6090(94)06279-X

  • THERMALLY-INDUCED STRUCTURAL MODIFICATION OF NANOMETER-ORDER MO-SI MULTILAYERS BY THE SPECTRAL REFLECTANCE OF LASER-PLASMA SOFT X-RAYS Reviewed

    H AZUMA, A TAKEICHI, KONOMI, I, Y WATANABE, S NODA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   32 ( 5A )   2078 - 2082   1993.5 (   ISSN:0021-4922 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN J APPLIED PHYSICS  

    Thermally induced structural modification of a nm-order multilayer of Mo/Si was investigated by spectral reflectance of soft X-rays from laser-produced plasma. Dependence of reflectivity of the nm-order multilayers on the incidence angle of soft X-rays indicated that some structural changes start to occur at 300-degrees-C and that the nm-order multilayer structures shrink at 500-degrees-C because of the formation of Mo-silicide. These results were found to be consistent with the cross-sectional transmission electron microscope observations. It is clearly shown that measurement of spectral reflectance of soft X-rays from laser plasma is a powerful method for analyzing nm-order structural modifications of multilayers.

    DOI: 10.1143/JJAP.32.2078

  • SINGLE-SHOT MEASUREMENT OF SPECTRAL REFLECTANCE OF A SOFT-X-RAY MULTILAYER MIRROR USING A LASER-PLASMA X-RAY SOURCE Reviewed

    H AZUMA, Y WATANABE, Y KATO, T MOTOHIRO, S NODA, K MURAI

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS   31 ( 2B )   L203 - L205   1992.2 (   ISSN:0021-4922 )

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN J APPLIED PHYSICS  

    We propose a new experimental arrangement to measure spectral reflectance of multilayer coatings in the soft X-ray region in a single laser shot, where laser-produced plasma is used as a light source. Reflectivity measurement of a Mo/Si multilayer having a 2d spacing of 24 nm is presented.

    DOI: 10.1143/JJAP.31.L203

  • Microstructures of Obliquely Deposited Thin Films (III)

    Watanabe Yosihihide, Takeda Yasuhiko, Motohiro Tomoyoshi, Noda Shoji

    Journal of the Japan Society of Powder and Powder Metallurgy   38 ( 3 )   345 - 347   1991 (   ISSN:0532-8799 )

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Powder and Powder Metallurgy  

    Thin films were formed by simultaneous depositions from two AF-sputter sources which were mounted so that the incident angles of the sputtered particles were +70° and -70° from the substrate normal. A microstructure of ZnTe/SiO&lt;SUB&gt;2&lt;/SUB&gt; thin film were examined by TEM. The ZnTe/SiO&lt;SUB&gt;2&lt;/SUB&gt; thin film was an anisotropic nm-scale composite whose microstructure was similar to that of the film computer-generated with the simulated deposition conditions. A Cu/SiO&lt;SUB&gt;2&lt;/SUB&gt; thin film was also inferred to have an anisotrop ic microstructure through the observation of the polarization of the...

    DOI: 10.2497/jjspm.38.345

  • Nanometer-Scale Composite Structures Formed by Simultaneous Oblique Sputter-Deposition of Two Materials from Different Directions Reviewed

    Tomoyoshi Motohiro, Yasuhiko Takeda, Yoshihide Watanabe, Shoji Noda

    MRS Proceedings   206   1990.1

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Cambridge University Press ({CUP})  

    DOI: 10.1557/proc-206-423

▼display all

MISC

  • On-site Annual Meeting of JVSS 2023 at Nagoya

    WATANABE Yoshihide

    Vacuum and Surface Science   67 ( 7 )   309 - 309   2024.7 (   ISSN:2433-5835   eISSN:2433-5843 )

     More details

    Language:Japanese   Publisher:The Japan Society of Vacuum and Surface Science  

    DOI: 10.1380/vss.67.309

  • Report on JVSS2023

    WATANABE Yoshihide

    Vacuum and Surface Science   67 ( 5 )   238 - 238   2024.5 (   ISSN:2433-5835   eISSN:2433-5843 )

     More details

    Language:Japanese   Publisher:The Japan Society of Vacuum and Surface Science  

    DOI: 10.1380/vss.67.238

  • Report on Open Lecture by Chubu Chapter : Science of Origami

    WATANABE Yoshihide

    Vacuum and Surface Science   66 ( 10 )   613 - 613   2023.10 (   ISSN:2433-5835   eISSN:2433-5843 )

     More details

    Language:Japanese   Publisher:The Japan Society of Vacuum and Surface Science  

    DOI: 10.1380/vss.66.613

  • Report on Chubu Chapter Workshop 2022

    WATANABE Yoshihide

    Vacuum and Surface Science   66 ( 2 )   124 - 124   2023.2 (   ISSN:2433-5835   eISSN:2433-5843 )

     More details

    Language:Japanese   Publisher:The Japan Society of Vacuum and Surface Science  

    DOI: 10.1380/vss.66.124

  • Purpose of this Special Issue : "Vacuum and Surface Science of Films"

    WATANABE Yoshihide, YAMASHITA Yoshiyuki

    Vacuum and Surface Science   64 ( 4 )   154 - 155   2021 (   ISSN:2433-5835   eISSN:2433-5843 )

     More details

    Language:Japanese   Publisher:The Japan Society of Vacuum and Surface Science  

    DOI: 10.1380/vss.64.154

  • Report on Open Lecture by Chubu Chapter : Cooking Science

    WATANABE Yoshihide

    Vacuum and Surface Science   61 ( 12 )   805 - 805   2018 (   ISSN:2433-5835 )

     More details

    Language:Japanese   Publisher:The Japan Society of Vacuum and Surface Science  

  • A new optimizing technique of a diesel engine aftertreatment system using HC DeNo(x) catalyst

    M Ueda, A Asano, T Kondo, Y Watanabe, T Fukuma, Y Harada

    JSAE REVIEW   24 ( 1 )   47 - 51   2003.1 (   ISSN:0389-4304 )

     More details

    Language:English   Publisher:ELSEVIER SCIENCE BV  

    A new method that optimizes a control map of hydrocarbon (HC) addition to diesel exhaust gas for HC type Selective Catalytic Reduction DeNO(x) catalyst system has been developed. This method comprises a numerical model and a new optimization technique. The numerical model is capable of predicting performance of HC DeNO(x) with diesel fuel as a supplemental reductant. The control map of HC addition was optimized with the evolutionary programming based on the evolution of living things. As a result, NOx conversion with the optimized control map was found to be greater by 21% than that with the conventional control on Japanese 10-15 mode. (C) 2003 Society of Automotive Engineers of Japan, Inc. and Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0389-4304(02)00249-7

  • Numerical Optimization of HC Supply for HC-DeNOx System (1) Numerical Modeling of HC-DeNOx Catalyst (Special Issue: Challenges in Realizing Clean High-Performance Diesel Engines)

    37 ( 3 )   32 - 39   2002.9 (   ISSN:0385-1508 )

     More details

    Language:English   Publisher:豊田中央研究所  

  • Pt/Fe熱処理セピオライト触媒 (特集:排気浄化用触媒)

    坂野 幸次, 渡辺 佳英, 杉浦 正洽

    豊田中央研究所R&Dレビュ-   33 ( 3 )   13 - 21   1998.9 (   ISSN:0385-1508 )

     More details

    Language:Japanese   Publisher:豊田中央研究所  

  • 斜め蒸着膜のミクロ構造-3-(ナノメ-タコンポジット材料)

    渡辺佳英, 竹?田?康?彦, 元?広?友?美, 野?田?正?治

    Journal of the Japan Society of Powder and Powder Metallurgy   38 ( 3 )   345 - 347   1991 (   ISSN:0532-8799 )

     More details

    Language:Japanese   Publisher:Japan Society of Powder and Powder Metallurgy  

    Thin films were formed by simultaneous depositions from two AF-sputter sources which were mounted so that the incident angles of the sputtered particles were +70° and -70° from the substrate normal. A microstructure of ZnTe/SiO2 thin film were examined by TEM. The ZnTe/SiO2 thin film was an anisotropic nm-scale composite whose microstructure was similar to that of the film computer-generated with the simulated deposition conditions. A Cu/SiO2 thin film was also inferred to have an anisotrop ic microstructure through the observation of the polarization of the transmitted light. Simultaneous oblique depositions from two sources will be a promising method to generate unique sans composites.

    DOI: 10.2497/jjspm.38.345

    Other Link: https://jlc.jst.go.jp/DN/JALC/00008562395?from=CiNii

▼display all

Books

  • Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry

    Yoshihide Watanabe( Role: Contributor ,  Model Reactions Over Size-Selected Clusters on Oxide Surfaces)

    Elsevier  2017 

     More details

    Book type:Scholarly book

Presentations

  • Metastability in the Insulator-Metal Transition for Individual VO2 Nanoparticles International conference

    K. Nishikawa, J. Nishida, T. Kumagai, Y. Watanabe

    NanospecFY2023  ( Okazaki Conference Center )   2024.3 

     More details

    Event date: 2024.3

    Presentation type:Poster presentation  

  • Thermal Hysteresis Loop in IR Reflectivity of Nanostructured Phase-Change-Material VO2 Presentation International conference

    Kazutaka Nishikawa*, Masamichi Yoshimura, Yoshihide Watanabe

    MRS Fall Meeting 2021  ( Boston,USA )   2021.12  Materials Research Society

     More details

    Presentation type:Oral presentation (general)  

  • Morphology of nanostructured VO2 films fabricated by sputtering and annealing process International conference

    Kazutaka Nishikawa*, Masamichi Yoshimura, Yoshihide Watanabe

    9th International Symposium on Surface Science (ISSS-9)  ( Online )   2021.11  The Japan Society of Vacuum and Surface Science

     More details

    Presentation type:Oral presentation (general)  

  • 酸化物表面上における質量選別Ptクラスタの構造とCO酸化反応 Invited International conference

    渡邊 佳英, 紅谷 篤史**, S. M. F. Shahed**

    日本表面真空学会学術講演会  ( つくば )   2019.10 

     More details

    Presentation type:Oral presentation (invited, special)  

  • Cluster-support interactions control the morphological transitions and Invited International conference

    Yoshihide Watanabe, Syed Mohammad, Fakruddin Shahed, Hirohito Hirata, Atsushi Beniya

    Cluster Surface Interaction Workshop 2018  ( Clarion Hotel & Congress Trondheim )   2018.6 

     More details

    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (invited, special)  

  • 酸化物上2次元Ptクラスタと3次元Ptクラスタの構造転移と触媒特性 Invited

    渡邊佳英

    次世代デバイス実現に向けた先端二次元物質の物理と化学  ( 科学技術交流財団研究交流センター, 名古屋 )   2016.10  公益財団法人科学技術交流財団

     More details

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

▼display all

Awards

  • AVS Shop Notes prize for 2016

    2017.6   AVS(American Vacuum Society)   Portable ultrahigh-vacuum sample storage system for polarization-dependent total-reflection fluorescence x-ray absorption fine structure spectroscopy

    Yoshihide Watanabe, Yusaku F. Nishimura, Ryo Suzuki, Hiromitsu Uehara, Tomoyuki Nimura, Atsushi Beniya, Noritake Isomura, Kiyotaka Asakura, Satoru Takakusagi

     More details

    “Portable ultrahigh-vacuum sample storage system for polarization-dependent total-reflection fluorescence x-ray absorption fine structure spectroscopy,” J. Vac. Sci. Technol. A 34 (2), 023201 (2016)が対象論文
    Yoshihide Watanabe, Yusaku F. Nishimura, Ryo Suzuki, Hiromitsu Uehara, Tomoyuki Nimura, Atsushi Beniya, Noritake Isomura, Kiyotaka Asakura and Satoru Takakusagi

  • AVS Shop Notes prize for 2016

    2016   American Vacuum Society  

Other research activities

  • 朝日遺跡サポーター

    2018

Subject in charge(Off-campus)

  • 大学院工学専攻特別講義B

    2020.12 - 2021.1 Institution:名古屋工業大学

  • ナノ材料評価学特論Ⅰ(一部)

    2019.6 - 2023.5 Institution:名古屋工業大学

Social Activities

  • 清須マイスター

    Role(s): Advisor, Organizing member

    2017

     More details

    Type:Other