A5090077159- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Organic Electronics and Photovoltaics
- Quantum Dots Synthesis And Properties
- Nonlinear Optical Materials Studies
- Plasmonic and Surface Plasmon Research
- Conducting polymers and applications
- Transition Metal Oxide Nanomaterials
- Molecular Junctions and Nanostructures
- Copper-based nanomaterials and applications
- Crystallization and Solubility Studies
- Photochromic and Fluorescence Chemistry
- X-ray Diffraction in Crystallography
- Advanced Nanomaterials in Catalysis
- Nanocluster Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Catalytic Processes in Materials Science
- Advancements in Battery Materials
- Photonic Crystals and Applications
- Advanced battery technologies research
- Radical Photochemical Reactions
- Gas Sensing Nanomaterials and Sensors
- Advanced Battery Materials and Technologies
- Photoacoustic and Ultrasonic Imaging
Nagasaki University
2025
Kyushu University
2012-2024
Mitsui Chemicals (Japan)
2024
Japan Science and Technology Agency
2020-2021
National Institute of Technology, Kochi College
2020-2021
Japan Aviation Electronics Industry (Japan)
2018
The University of Tokyo
2004-2014
Dokkyo Medical University Saitama Medical Center
2014
Juntendo University Hospital
2014
Tokyo University of Science
2010-2011
Charge separation induced by localized surface plasmon resonance (LSPR) of gold and silver nanoparticles (AuNPs AgNPs) are applied to various devices photoelectrochemical functionalities. Here, we develop all solid state In/TiO2/MNPs/ITO photovoltaic cells (MNP = AuNP or AgNP) using two-dimensional MNP ensembles. Their quantum efficiencies higher than those previously reported with hole-transport materials (HTMs) (ITO/TiO2/AuNPs/HTM/Au). The photoresponses from without HTMs suggest that the...
Abstract Current greenhouse gas emissions suggest that keeping global temperature increase below 1.5 degrees, as espoused in the Paris Agreements will be challenging, and to do so, achievement of carbon neutrality is utmost importance. It also clear no single solution can meet neutral challenge, so it essential for scientific research cover a broad range technologies initiatives which enable realization free energy system. This study details broad, yet targeted themes being pioneered within...
Reversed photoresponse: Indium tin oxide (ITO)/Au nanoparticle (NP)/TiO(2) electrodes (see picture) exhibit cathodic photocurrents and positive photopotentials under visible light, whereas ITO/TiO(2)/Au NP show an inverted response. This behavior indicates that electron transfer occurs from the plasmon-excited Au NPs to TiO(2) film. An enhanced O(2) photoreduction activity is found for ITO/Au NP/TiO(2)/Pt electrodes.
Plasmonic metal nanoparticles are known to work as light-harvesting antennae and enhance photocurrents of photovoltaic cells reaction rates photocatalysts. The effects expected increase the energy conversion efficiency reduce thickness a light-absorbing layer costs for materials. In this work, we examined plasmonic enhancement dye-sensitized by Au nanoparticle ensembles with different particle densities study interparticle plasmon coupling on photocurrent enhancement. allow in longer...
Elevating the charging voltage of lithium-ion batteries with a cathode is investigated to develop them toward high capacity and energy density. Three countermeasures are found be essential overcome side reactions subsequent cycle degradations caused by higher potential: limiting cut-off potential below vs for cathode, modification particles element, controlling ratio ethylene carbonate in electrolyte, which major cause degradation an elevated condition. It suggested that oxidized dissolves...
Hemispheric gold or silver nanoparticle (Au and AgNP) ensembles were electrodeposited on a smooth ITO electrode through thin Al2O3 nanomask. The nanomask reduced the deviation in particle size interparticle distance. absorption peak based localized surface plasmon resonance (LSPR) of AuNP ensemble redshifted with increasing environmental refractive index, suggesting that would be used as LSPR sensor for chemical analysis bioanalysis. prevented Au AgNPs from thermal coalescence even at 500...
A TiO2-coated indium tin oxide electrode was further coated with Ni(OH)2 by electrodeposition to obtain a TiO2-Ni(OH)2 bilayer film. Upon irradiation of the film UV light in pH 10 buffer, layer oxidized, and it turned from colorless brown; oxidative energy stored layer. The potential thus about +0.7 V versus Ag|AgCl. could be reversibly taken out chemical electrochemical means. photooxidized rereduced alcohols, aldehydes, phenol, I-, H2O2, formate, acetone.
Photocurrents of a ruthenium dye–TiO2 system are enhanced by gold nanoparticles (100 or 40 nm diameter) embedded in TiO2. As dye–particle spacing decreases to 10 nm, enhancement factor and intensity localized electric fields at the TiO2 surface increase. A further decrease suppresses enhancement.
NiO, Co(OH)2, Ir oxide, and Ru oxide were combined as rechargeable materials with TiO2 or Pt-TiO2 photocatalyst to obtain novel photocatalysts oxidative energy storage abilities. which is more stable than the conventional material, Ni(OH)2, showed similar characteristics those of Ni(OH)2. The redox potential Co(OH)2 was negative, positive that photoelectrochemically charged reduced by acetone, acetic acid, Br−, water. diversity accordingly improved in terms reaction stability.
The in-plane plasmon resonant energy transfer (PRET) effect from gold significantly boosts the hydrogen evolution of Z-scheme CdS/BiVO 4 photocatalyst.
A polythiophene thin film was fabricated on gold nanoparticle (AuNP)-deposited indium-tin-oxide (ITO) electrodes with electropolymerization, whereas AuNPs were predeposited the ITO surface. photocurrent via photoexcited increased which attributed to localized surface plasmon resonance. Investigation of AuNP-density dependence relative enhancement revealed maximum effect at 14% AuNP-density, while 68% exhibited smaller than electrode without AuNPs. We have that effects saturate in fairly low...
We proposed a nanoscale oxidative polymerization method which enables site-selective deposition on the surface of gold nanoparticles (AuNPs) combined with TiO2 by using plasmon induced charge separation (PICS) under visible-to-near infrared (IR) light irradiation. The also revealed that anodic site PICS was located at AuNPs.
Peritonitis is a serious complication in peritoneal dialysis patients and requires antibiotic administration. Intraperitoneal vancomycin an empiric therapy for peritonitis caused by Gram-positive cocci; however, there no way to predict absorption after intraperitoneal Therefore, we aimed evaluate the changes injection into mice with chlorhexidine gluconate (CG) induced injuries. Additionally, examined correlation between equilibration test (PET) score. PET score was determined using glucose...
Quantum-sized gold clusters are deposited on TiO2 both as a photosensitizer and catalyst, coupled to plasmonic nanoparticles light harvesting antenna. Photocurrent enhancement was observed for Au25(SG)18 Au38(SG)24 but not Au102(SG)44 (SG = glutathione). The maximum factor of ∼9 is reached at 900 nm.
Visible light driven photocatalysts, N-doped TiO2, Fe(III)-modified WO3, Cu(II)-modified WO3 and Pt nanoparticle-loaded were combined with Ni(OH)2 as an oxidative energy storage material, to overcome two serious limitations of TiO2 photocatalyst; it works only under light, the must contain UV. Among photocatalysts examined, 1 wt% Pt-loaded WO3/Ni(OH)2 bilayer film exhibits highest efficiency visible (≥420 nm), sunlight fluorescent light. The is possible even 460 nm Other (0.1–10 wt%), also...
Photocatalytic remote oxidation was examined under visible light by using WO3-based photocatalysts: WO3, WO3 modified with Pt nanoparticles (Pt–WO3), and Cu(II) ions (Cu(II)–WO3). Alkyl chains on a glass plate separated from the photocatalyst 7.5 μm thick air were removed in 40 min (≥420 nm, ∼100 mW cm–2). Among photocatalysts examined, Pt–WO3 exhibits highest activity. Its activity is higher than that of TiO2 wavelength range 360–460 nm. It likely emits •OH light, which diffuses attacks...
In the present work silver nanoparticles (cubes and spheres) with sizes of 40 ± 5 nm have been synthesized by a similar experimental method in order to optimize both photoluminescence photoelectric conversion enhancement factor poly(3-hexylthiophene) photoelectrodes thickness comparable those used organic solar cells. The were assembled into monolayers various coverage densities using Langmuir–Blodgett technique. dependence surface plasmon evanescent field energy transfer has investigated...
Oxidative energy generated by UV-irradiated TiO2 photocatalyst was stored in Ni(OH)2 that 12.5–50 μm apart from the TiO2. It is likely active oxygen species on diffused into gas phase and oxidized Ni(OH)2. Loading with Pt accelerated remote storage an order of magnitude. revealed could be taken out used chemically or electrochemically. The reduced gaseous formaldehyde, formate, ethanol H2O2.
A TiO(2)-Ni(OH)(2) bilayer photocatalyst is known as a with energy storage abilities. Oxidative from the UV-irradiated TiO(2) underlayer can be stored in Ni(OH)(2) overlayer. We investigated oxidation and mineralization of methanol formaldehyde by oxidative mean gas chromatography. When concentration air low 10 ppm, mass conversion efficiency to CO(2) approximately 86%. Formaldehyde also oxidized energy.