CVClient

Kazushi Miki

  (三木 一司)

Profile Information

Affiliation
Professor, Department of Electrical Engineering and Material, University of Hyogo
Degree
Ph.D in enginnering(University of Tsukuba)

J-GLOBAL ID
200901040326748080
researchmap Member ID
5000006371

パワーデバイスの新材料、β型酸化ガリウムのドーピングに関する研究を実施中。SPring-8に近い、地の利を利用して放射光を用いた評価技術を積極的に利用している。

Papers

 112
  • Okkyun Seo, Jaemyung Kim, Jiayi Tang, L.S.R. Kumara, Koji Kimoto, Kazushi Miki, Akifumi Matsuda, Mamoru Yoshimoto, Osami Sakata
    Journal of Alloys and Compounds, 945 169177-169177, Jun, 2023  
  • Koichi Murata, Shuhei Yagi, Takashi Kanazawa, Satoshi Tsubomatsu, Christopher Kirkham, Koh-ichi Nittoh, David R Bowler, Kazushi Miki
    Nano Futures, 5(4) 045005-045005, Dec 1, 2021  
    Abstract Conventional doping processes are no longer viable for realizing extreme structures, such as a δ-doped layer with multiple elements, such as the heavy Bi, within the silicon crystal. Here, we demonstrate the formation of (Bi + Er)-δ-doped layer based on surface nanostructures, i.e. Bi nanolines, as the dopant source by molecular beam epitaxy. The concentration of both Er and Bi dopants is controlled by adjusting the amount of deposited Er atoms, the growth temperature during Si capping and surfactant techniques. Subsequent post-annealing processing is essential in this doping technique to obtain activated dopants in the δ-doped layer. Electric transport measurement and photoluminescence study revealed that both Bi and Er dopants were activated after post-annealing at moderate temperature.
  • Haidong Zhao, Katsuhiro Isozaki, Tomoya Taguchi, Shengchun Yang, Kazushi Miki
    PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 23(47) 26822-26828, Dec, 2021  
    Laying-down gold nanorods (GNRs) of a monolayer immobilized on a solid substrate was realized with a hybrid method, a combination of three elemental technologies: surface modification, electrophoresis, and solvent evaporation. The self-assembly of CTAB-protected GNRs in the solution was induced by 0.05 mM of EDTA. The assembled GNRs were deposited in a laying-down form on the solid surface during the hybrid method. The final coverage was over 71% on the substrate with an area larger than 0.6 cm(2). The spacing between the sides of the GNRs was fixed to be 4.6 +/- 0.9 nm by the thermal annealing-promoted crystalline packing of the bilayer of CTAB salt-bridged with EDTA. The obtained laying-down GNRs of a monolayer on the gold substrate show a small shift of the transverse LSPR around 550-570 nm (with a width of around 100 nm) and a large red shift of the longitudinal LSPR to be 900-1050 nm (with a width of 500 nm), because of the strong electromagnetic coupling between the GNRs and gold substrate. Therefore it can be used in a wide range of wavelengths for surface enhanced Raman spectroscopy (SERS) applications. The film has a high enhancement factor with 10(5) for R6G.
  • Katsuhiro Isozaki, Tomoya Taguchi, Kosuke Ishibashi, Takafumi Shimoaka, Wataru Kurashige, Yuichi Negishi, Takeshi Hasegawa, Masaharu Nakamura, Kazushi Miki
    Catalysts, 10(8) 908-908, Aug 9, 2020  Peer-reviewed
    The self-assembled monolayer (SAM)-modified metallic nanoparticles (MNPs) often exhibit improved chemoselectivity in various catalytic reactions by controlling the reactants’ orientations adsorbed in the SAM; however, there have been a few examples showing that the reaction rate, i.e., catalytic activity, is enhanced by the SAM-modification of MNP catalysts. The critical parameters that affect the catalytic activity, such as the supports, nanoparticle size, and molecular structures of the SAM components, remain uninvestigated in these sporadic literature precedents. Here, we report the mechanistic investigation on the effects of those parameters on the catalytic activity of alkanethiolate SAM-functionalized gold nanoparticles (AuNPs) toward silane alcoholysis reactions. The evaluation of the catalytic reaction over two-dimensionally arrayed dodecanethiolate SAM-functionalized AuNPs with different supports revealed the electronic interactions between AuNPs and the supports contributing to the rate enhancement. Additionally, an unprecedented size effect appeared—the AuNP with a 20 nm radius showed higher catalytic activity than those at 10 and 40 nm. Infrared reflection–absorption spectroscopy revealed that the conformational change of alkyl chains of the SAM affects the entrapment of reactants and products inside the SAM, and therefore brings about the acceleration effect. These findings provide a guideline for further applying the SAM-functionalization technique to stereoselective organic transformations with designer MNP catalysts.
  • Bulgarevich Kirill, Sakamoto Kenji, Minari Takeo, Yasuda Takeshi, Miki Kazushi, Takeuchi Masayuki
    ADVANCED FUNCTIONAL MATERIALS, 29(45), Nov, 2019  Peer-reviewed

Misc.

 134

Professional Memberships

 1

Research Projects

 22