A5059964099- Magneto-Optical Properties and Applications
- Advanced Photocatalysis Techniques
- Gas Sensing Nanomaterials and Sensors
- TiO2 Photocatalysis and Solar Cells
- Copper-based nanomaterials and applications
- Magnetic Field Sensors Techniques
- Transition Metal Oxide Nanomaterials
- Surface Roughness and Optical Measurements
- Magnetic Properties and Synthesis of Ferrites
- Ga2O3 and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Fiber Optic Sensors
- ZnO doping and properties
- Photonic and Optical Devices
- Electronic and Structural Properties of Oxides
- Iron oxide chemistry and applications
- Multiferroics and related materials
- Advanced Memory and Neural Computing
- Magnetic Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Catalytic Processes in Materials Science
- Bone Tissue Engineering Materials
- Mesoporous Materials and Catalysis
- Magnetic properties of thin films
- Concrete and Cement Materials Research
Nagaoka University
2015-2024
Nagaoka University of Technology
2014-2024
Yokohama National University
2010-2011
Amorphous copper oxide (Cu(II)) nanoclusters function as efficient electrocatalysts for the reduction of carbon dioxide (CO2) to monoxide (CO). In addition promoting electrocatalytic activity, Cu(II) act cocatalyts CO2 photoreduction when grafted onto surface a semiconductor (light harvester), such niobate (Nb3O8–) nanosheets. Here, photocatalytic activity and reaction pathway Cu(II)-grafted Nb3O8– nanosheets was investigated using electron spin resonance (ESR) analysis isotope-labeled...
Titanium dioxide (TiO2), as an excellent photocatalyst, has been intensively investigated and widely used in environmental purification. However, the wide band gap of TiO2 rapid recombination photogenerated charge carriers significantly limit its overall photocatalytic efficiency. Here, efficient visible-light-active photocatalysts were developed on basis modified with two ubiquitous nanoclusters. In this system, amorphous Ti(IV) oxide nanoclusters demonstrated to act hole-trapping centers...
We successfully clarified the mechanisms of visible-light-driven photocatalytic reactions Fe(III)-grafted TiO2 (Fe/TiO2) and Ru-doped (Fe/Ru:TiO2). ESR spectroscopy revealed that visible-light response Fe/TiO2 photocatalyst resulted in direct charge transfer from valence band to grafted Fe ions. For Fe/Ru:TiO2 photocatalyst, acceptor levels were formed by doping Ru ions lattice TiO2, electrons at excited on irradiation readily Since a longer wavelength light generated conduction electrons,...
Hematite (α-Fe2O3) emerges as an enticing material for visible-light-driven photocatalysis owing to its remarkable stability, low toxicity, and abundance. However, inherent shortcomings, such a short hole diffusion length high recombination rate, hinder practical application. Recently, oxygen vacancies (Vo) within hematite have been demonstrated modulate photocatalytic attributes. The effects of Vo can be broadly categorized into two opposing aspects: (1) acting electron donors, enhancing...
In order to improve photocatalytic activity of BiVO4, the co-grafting effects two kinds co-catalysts for electron and hole separations were examined. At first, stabilization electrons in BiVO4 by grafting Fe3+ was confirmed analyzing formation O2− H2O2 as reduction intermediates O2. When co-grafted with CoPi an separator a separator, respectively, its decomposition gaseous acetaldehyde visible light (470 nm LED) enhanced compared grafted only either co-catalyst. This indicated that is...
Understanding the details of mechanism water photo-oxidation on monoclinic bismuth vanadate (m-BiVO4) is intriguing for efficient oxygen (O2) evolution under solar light. Hydroxyl (OH) radical was confirmed in a photocatalytic system m-BiVO4 powders. OH highly reactive to dimerize into hydrogen peroxide (H2O2), which further oxidized O2 molecule. Therefore, from radicals could be one plausible mechanisms. In present study, clarify significance radicals, molecules and were generated by...
V 1- x Ti O 2 films were prepared on glass substrates by excimer-laser-assisted metal organic deposition (ELAMOD) and thermal MOD processes. The VO phase was successfully formed in the range of = 0–0.35 at 300 °C air using ELAMOD process. This is a big advantage terms fabrication process for or substrates. It also confirmed that dense obtained preparing TiO buffer layers Furthermore, detailed effect content metal–insulator (MI) transition properties examined. As increased, broadening MI...
A plausible reaction mechanism for a visible light photocatalyst of TiO(2) modified with platinum(IV) chloride (PtCl) was proposed on the basis measurements electron spin resonance (ESR) spectroscopy and chemiluminescence photometry. Under (λ > 500 nm) irradiation, deposited Pt(IV) is charge-separated into Pt(3+) Cl radical by excitation ligand-to-metal charge transfer. The gives an to conduction band TiO(2), which has return Pt(4+). in reduces oxygen molecule O(2)(-). presence O(2)(-) been...
Thermal hysteresises of electrical resistance, accompanying with a structural phase transition, in epitaxial VO2 films have been successfully reduced to 1°C or less by doping Ti Nb ions. We considered that owing the metal-ion-substitutive defects induced metal ions into films, transition easily occurred without superheating supercooling. In Nb-doped hysteresis disappeared at lower level than Ti-doped films. The maximum values temperature coefficient resistance V0.91Ti0.09O2 and...
Ion-irradiated quartz, albite, and microcline were analyzed to understand the mechanism of neutron irradiation degradation concrete structures in nuclear power plants for long-term operation. While mineral amorphization has previously been directly associated with expansion aggregates, our study showed that volume is more pronounced after crystalline become amorphous. The temperature dependence correlated well recovery unpaired electrons viscous flow amorphized quartz.
An excimer laser assisted metal organic deposition process for the preparation of vanadium dioxide (VO2) films is described. When a precursor film grown on silica glass substrate by preheating at 300°C was irradiated with KrF room temperature in air, crystallized into polycrystalline VO2 phases. Generally, requires strict atmosphere control, but this process, were successfully prepared without it. Moreover, it revealed that crystallization phases promoted TiO2 buffer layer placed substrate....