A5005480514- Fusion materials and technologies
- Advanced ceramic materials synthesis
- Nuclear Materials and Properties
- Advanced materials and composites
- Metal and Thin Film Mechanics
- Quantum Dots Synthesis And Properties
- Ion-surface interactions and analysis
- Aluminum Alloys Composites Properties
- Advanced Photocatalysis Techniques
- Microstructure and Mechanical Properties of Steels
- Hydrogen embrittlement and corrosion behaviors in metals
- Silicon Carbide Semiconductor Technologies
- Intermetallics and Advanced Alloy Properties
- High-Temperature Coating Behaviors
- Gold and Silver Nanoparticles Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- TiO2 Photocatalysis and Solar Cells
- Copper-based nanomaterials and applications
- Catalytic Processes in Materials Science
- Metal Alloys Wear and Properties
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Hydrogen Storage and Materials
- Nonlinear Optical Materials Studies
- Electronic and Structural Properties of Oxides
Hokkaido University
2015-2024
Sapporo Science Center
2015-2020
Swinburne University of Technology Sarawak Campus
2020
Faculty (United Kingdom)
2011-2018
Engineering (Italy)
2011-2018
Hitachi (Japan)
2018
Nagoya University of Commerce and Business
2013
Muroran Institute of Technology
2009
Nagoya University
2006-2007
Tokyo University of Science
2007
Nanoparticles of ZnS−AgInS2 solid solution (ZAIS) were synthesized by the thermal decomposition (AgIn)xZn2(1-x)(S2CN(C2H5)2)4 precursors in a hot oleylamine solution. X-ray powder diffraction analyses revealed that resulting nanoparticle powders not mixture ZnS and AgInS2 but which fraction was enlarged with decrease value x, is, an increase content Zn2+ used. The energy gap ZAIS nanoparticles could be controlled composition Intense emission observed at room temperature, regardless kind...
Decahedral single-crystalline anatase particles prepared by a newly developed gas-phase process showed photocatalytic activities superior to those of P25 photocatalyst despite their relatively smaller specific surface area compared with that P25, probably because the low density particle boundaries and crystalline defects.
Octahedral titanium(IV) oxide (TiO(2)) crystallites with exposed anatase [101] facets exhibited relatively high photocatalytic activity for oxidative decomposition of organic compounds and low hydrogen evolution in the absence molecular oxygen, probably due to characteristics surface.
The photoluminescence intensity of ZnS–AgInS2 solid solution nanoparticles was remarkably enhanced by increasing the heating temperature to 180 °C, above which emission simply diminished, while ZnS coating particles resulted in further enhancement PL intensity, giving highest quantum yield ca. 80%.
Colloidal Cu2ZnSnS4 (CZTS) nanoparticles with sizes of 5–6 nm that contain no highly toxic elements were successfully synthesized through thermal reactions metal acetate and sulfur in high-temperature oleylamine solution. The reaction temperature was a key factor for the synthesis CZTS nanoparticles: at temperatures higher than 240 °C gave pure crystal phase, whereas secondary phase CuS formed lower 180 °C. Nanoparticles accumulated on ITO-coated or quartz glass substrates via layer-by-layer...
An anomaly in differential scanning calorimetry has been reported a number of metallic glass materials which broad exothermal peak was observed between the and crystallization temperatures. The mystery surrounding this calorimetric is epitomized by four decades long studies Pd-Ni-P glasses, arguably best glass-forming alloys. Here we show, using suite situ experimental techniques, that alloys have hidden amorphous phase supercooled liquid region. anomalous consequence polyamorphous...
Formation of spherical nanoparticles (hereafter “nanoballs”) in a gas/liquid mixed dual phase system during plasma electrolysis is reported. A gas/vapor sheath formed at the electrode/electrolyte interface when applied voltage high enough to induce discharge plasma. Through this nonequilibrium process, authors have produced Ni, Ti, Ag, and Au metallic nanoballs from cathode mother materials with certain size controllability. The electrode surface partially melted by local current...
When applied in optoelectronic devices, a ZnO semiconductor dominantly absorbs or emits ultraviolet light because of its direct electron transition through wide energy bandgap. On the contrary, crystal defects and nanostructure morphology are chief key factors for indirect, interband transitions devices visible range. By illumination ultrapure water, we demonstrate here conceptually unique approach to tune shape nanorods from tapered capped-end via apical surface control. We show that oxygen...
Independently controlling the shape anisotropy and chemical composition of multinary semiconductor particles is important for preparing highly efficient photocatalysts. In this study, we prepared ZnS–AgInS2 solid solution ((AgIn)xZn2(1–x)S2, ZAIS) nanoparticles with well-controlled anisotropic shapes, rod rice by reacting corresponding metal acetates a mixture sulfur compounds different reactivities, elemental sulfur, 1,3-dibutylthiourea, via two-step heating-up process. The predominantly...
Trimetallic Au/Ag/Pt hetero-nanostructures (AAPHNs) with distinctive, designed morphology are synthesized by galvanic replacement reaction and a site-selective strategy. The three metals present on the surface shown to act synergistically enhance electro-catalytic performance durability for methanol oxidation. described structural modification of nanocomposites increases range potential applications include both oxygen reduction in fuel cells photocatalysis hydrogen evolution reaction. As...
The size-selective photoetching technique was used to control the size of a CdS nanoparticle inside silica shell. With monochromatic light irradiation, diffuse reflectance spectra silica-coated nanoparticles were blue-shifted, and resulting incorporated in shells adjustable by varying wavelength irradiated light. TEM observation revealed that original seemed be close contact with amorphous shell leave almost no clearance, while irradiation caused decrease particles, formation void space...
Sputter deposition of indium (In) in ionic liquids (ILs) could produce stable In metal nanoparticles whose surface was covered by an amorphous In2O3 layer to form In/In2O3 core/shell particles. The size the core tunable from ca. 8 20 nm selecting kind IL, whereas shell thickness almost constant at 1.9 nm. Heat treatment thus-obtained particles 523 K air oxidized core, resulting formation spherical hollow made crystalline In2O3. slightly larger than that used as a starting material, void...
The microstructures and mechanical properties of bcc iron-based high entropy alloy (HEA) Fe-20Mn-15Cr-10 V-10Al-2.5C (in at.%) without Co Ni elements have been investigated for applications in fields such as nuclear reactors magnetic motors aircraft automobiles. This was normalized at 1150 °C 2 h then water quenched, it heated 800 10 min quenched. had body center cubic (BCC)-phase vanadium carbides with 2–3 μm arranging along grain boundaries, the Vickers hardness 520 Hv, harder than pure...
Abstract Ag2ZnSnS4 (AZTS) nanoparticles were successfully synthesized at relatively low temperature via thermal reaction of corresponding metal acetates and a sulfur source in hot oleylamine solution, the purity particles being dependent on amount temperature. The obtained pure AZTS with size ca. 15 nm exhibited photoresponse visible light irradiation similar to that n-type semiconductors.
The indium sputter deposition into ionic liquids containing noble metal nanoparticles produces core–shell-structured metal@In<sub>2</sub>O<sub>3</sub>with high thermal and electrochemical stability.
Beryllium is a promising functional material for several breeder system concepts to be tested within the experimental fusion reactor ITER and, later, implemented in first commercial demonstration power plant DEMO. For these applications its resistance neutron irradiation and detrimental effects of radiogenic gases (helium tritium) crucial safety, subsequent waste management recycling. A reliable prediction beryllium behavior under conditions requires both dedicated experiments advanced...
The development of new catalysts with high N