Akinori Irizawa
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View article: Activation of Anionic Redox for Stoichiometric and Li-Excess Metal Sulfides through Structural Disordering: Joint Experimental and Theoretical Study
Activation of Anionic Redox for Stoichiometric and Li-Excess Metal Sulfides through Structural Disordering: Joint Experimental and Theoretical Study Open
Extensive research efforts have been dedicated to Li-excess compounds with anionic redox reaction as potential high-capacity positive electrode materials for Li-ion battery applications. The origin of activation on anionic redox is still u…
View article: Hybridized and Localized 4f Electronic States of Nd-based Intermetallic Compounds in Cubic Symmetry Probed by High-Energy Photoemission
Hybridized and Localized 4f Electronic States of Nd-based Intermetallic Compounds in Cubic Symmetry Probed by High-Energy Photoemission Open
We have performed soft and hard X-ray photoemission spectroscopies on NdTi2Al20 and NdBe13 which show antiferromagnetic ordering at low temperatures. The Nd 3d core-level photoemission and Nd 3d-4f valence-band resonant photoemission spect…
View article: Photochromic Color Tuning of Copper‐Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments
Photochromic Color Tuning of Copper‐Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments Open
Inorganic photochromic materials offer several advantages over organic compounds, including relatively inexpensive and higher thermal stability. However, tuning their color with the same component has remained a significant challenge. In t…
View article: Photochromic Color Tuning of Copper‐Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments
Photochromic Color Tuning of Copper‐Doped Zinc Sulfide Nanocrystals by Control of Local Dopant Environments Open
Inorganic photochromic materials offer several advantages over organic compounds, including relatively inexpensive and higher thermal stability. However, tuning their color with the same component has remained a significant challenge. In t…
View article: Investigating structural property of human hair by using infrared free electron lasers
Investigating structural property of human hair by using infrared free electron lasers Open
Intense infrared (IR) rays can heat matters and evaporate waters thermally. One of the possible applications will be hair dryer, although the irradiation effects of IR rays on the hair have not been fully explored. In this study, we first …
View article: Light-assist electrochemical lithiation to silicon semiconductor
Light-assist electrochemical lithiation to silicon semiconductor Open
Charging rate of present lithium-ion batteries is needed to be fast for energy storage of electric vehicles. Light-assisted electrochemical reaction in lithium-ion batteries is one strategy to improve the rate capability. The original conc…
View article: Exploring Biomolecular Self-Assembly with Far-Infrared Radiation
Exploring Biomolecular Self-Assembly with Far-Infrared Radiation Open
Physical engineering technology using far-infrared radiation has been gathering attention in chemical, biological, and material research fields. In particular, the high-power radiation at the terahertz region can give remarkable effects on…
View article: THz: Research Frontiers for New Sources, Imaging and Other Advanced Technologies
THz: Research Frontiers for New Sources, Imaging and Other Advanced Technologies Open
The THz region of the electromagnetic spectrum is a frontier research area involving application of many disciplines, from outdoor to indoor communications, security, drug detection, biometrics, food quality control, agriculture, medicine,…
View article: High-power Terahertz Waves for a Recycle System of Amyloid Fibrils
High-power Terahertz Waves for a Recycle System of Amyloid Fibrils Open
Recycling of persistent materials is one of most important subjects to be addressed towards the sustainable society. Amyloid fibril is such a tough biomaterial that can be designed for various industrial applications, and it is usually dif…
View article: Terahertz as a Frontier Area for Science and Technology
Terahertz as a Frontier Area for Science and Technology Open
Recent theoretical and experimental research is triggering interest to technologies based on radiation in the region from ~0.1 to 20 Terahertz (THz). Today, this region of the electromagnetic (e.m.) spectrum is a frontier area for research…
View article: Detecting halfmetallic electronic structures of spintronic materials in a magnetic field
Detecting halfmetallic electronic structures of spintronic materials in a magnetic field Open
Band-gap engineering is one of the fundamental techniques in semiconductor technology and also applicable in the next generation spintronics using the spin degrees of freedom. To fully utilize the spintronic material, it is essential to op…
View article: Spatially Resolved Spectral Imaging by A THz-FEL
Spatially Resolved Spectral Imaging by A THz-FEL Open
Using the unique characteristics of the free-electron-laser (FEL), we successfully performed high-sensitivity spectral imaging of different materials in the terahertz (THz) and far-infrared (FIR) domain. THz imaging at various wavelengths …
View article: Angular Dependence of Copper Surface Damage Induced by an Intense Coherent THz Radiation Beam
Angular Dependence of Copper Surface Damage Induced by an Intense Coherent THz Radiation Beam Open
In this work, we show the damage induced by an intense coherent terahertz (THz) beam on copper surfaces. The metallic surface was irradiated by multiple picosecond THz pulses generated by the Free Electron Laser (FEL) at the ISIR facility …
View article: Luminescence induced by electrons outside zinc oxide nanoparticles driven by intense terahertz pulse trains
Luminescence induced by electrons outside zinc oxide nanoparticles driven by intense terahertz pulse trains Open
We investigated the behaviours of electrons from ZnO nanoparticles via a strong terahertz field. Luminescence from ZnO nanoparticles and surrounding nitrogen molecules was observed when the nanoparticles were irradiated with a terahertz fr…