Tsukasa Torimoto
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View article: Preface for the 72nd Special Feature “Research Frontiers of Photoelectrochemical Energy Conversion and Photocatalysis”
Preface for the 72nd Special Feature “Research Frontiers of Photoelectrochemical Energy Conversion and Photocatalysis” Open
Photoelectrochemical strategies offer promising pathways for both solar-to-electricity and solar-to-chemical conversion. Advances in functional materials and devices, including solar cells, photocatalysts, plasmonic materials, quantum dots…
View article: Enhancing Near‐Infrared Photoluminescence of Ag <sub>8</sub> GeS <sub>6</sub> Quantum Dots Through Compositional Fine‐Tuning and ZnS Coating for In Vivo Bioimaging (Small 32/2025)
Enhancing Near‐Infrared Photoluminescence of Ag <sub>8</sub> GeS <sub>6</sub> Quantum Dots Through Compositional Fine‐Tuning and ZnS Coating for In Vivo Bioimaging (Small 32/2025) Open
View article: Composition-Dependent Photoelectrochemical Properties of Low-Toxic Bismuth Chalcohalide Nanorods Synthesized via a Solution-Phase Method
Composition-Dependent Photoelectrochemical Properties of Low-Toxic Bismuth Chalcohalide Nanorods Synthesized via a Solution-Phase Method Open
Bismuth chalcohalides (Bi–S–X, where X = Cl, Br, or I) are promising candidates for photovoltaic and optoelectronic applications due to their low toxicity, narrow bandgaps, and solution processability. Here, we report a colloidal synthesis…
View article: Tuning Photoluminescence and Magnetic Properties of Ag–Ga–S and Zn–Ag–Ga–S Quantum Dots via Mn<sup>2+</sup> Doping
Tuning Photoluminescence and Magnetic Properties of Ag–Ga–S and Zn–Ag–Ga–S Quantum Dots via Mn<sup>2+</sup> Doping Open
Transition metal-doped colloidal quantum dots (QDs) are promising candidates for dual-mode imaging due to their tunable optical properties and potential magnetic functionalities. Here, we report the synthesis and characterization of Mn2+-d…
View article: Enhancing Near‐Infrared Photoluminescence of Ag <sub>8</sub> GeS <sub>6</sub> Quantum Dots Through Compositional Fine‐Tuning and ZnS Coating for In Vivo Bioimaging
Enhancing Near‐Infrared Photoluminescence of Ag <sub>8</sub> GeS <sub>6</sub> Quantum Dots Through Compositional Fine‐Tuning and ZnS Coating for In Vivo Bioimaging Open
Quantum dots (QDs) composed of a group I–IV–VI semiconductor, Ag 8 GeS 6 , have been intensively investigated for constructing efficient energy conversion systems. However, their potential for photoluminescence (PL)‐based applications has …
View article: Report from Photoelectrochemistry Research Group
Report from Photoelectrochemistry Research Group Open
View article: Front Cover: Tailoring Energy Structure of Low‐Toxic Ternary Ag−Bi−S Quantum Dots through Solution‐Phase Synthesis for Quantum‐Dot‐Sensitized Solar Cells (ChemNanoMat 10/2024)
Front Cover: Tailoring Energy Structure of Low‐Toxic Ternary Ag−Bi−S Quantum Dots through Solution‐Phase Synthesis for Quantum‐Dot‐Sensitized Solar Cells (ChemNanoMat 10/2024) Open
View article: Yolk@Shell Nanostructures for Water Splitting: Current Development and Future Prospects
Yolk@Shell Nanostructures for Water Splitting: Current Development and Future Prospects Open
With the escalating demand for clean and sustainable energy sources, hydrogen emerges as a paramount contender, necessitating efficient and innovative production methods of water splitting. This review ventures into the burgeoning field of…
View article: Solution-phase Synthesis and Photoelectrochemical Properties of Ag<sub>8</sub>SnSe<sub>6</sub> Quantum Dots with Different Sizes
Solution-phase Synthesis and Photoelectrochemical Properties of Ag<sub>8</sub>SnSe<sub>6</sub> Quantum Dots with Different Sizes Open
Ternary Ag8SnSe6 quantum dots (QDs) were synthesized via a heating-up method in which the reaction of corresponding metal acetates and selenourea was carried out at 250 °C in oleylamine containing 1-dodecanethiol (DDT) as a capping ligand.…
View article: Pure Green Ag–In–Ga–S/Ga–S Quantum Dot Light‐Emitting Diodes with Electron Transport Materials Exhibiting Enhanced Luminescence Properties
Pure Green Ag–In–Ga–S/Ga–S Quantum Dot Light‐Emitting Diodes with Electron Transport Materials Exhibiting Enhanced Luminescence Properties Open
Quantum dots (QDs) are essential luminescent materials with applications in wide‐color‐gamut displays requiring exceptional color reproducibility. Multinary semiconductor QDs composed of groups I, III and VI elements are expected to serve …
View article: Development of Pure Color Light-Emitting Diodes Using Multinary Semiconductor Quantum Dots
Development of Pure Color Light-Emitting Diodes Using Multinary Semiconductor Quantum Dots Open
広色域ディスプレイの実現を目指し,高色純度な発光が得られる量子ドットを用いた発光素子を開発した.硫化銀インジウムなどに代表される多元系半導体からなる量子ドット材料の高色純度化と発光波長制御に取り組み,バンド端遷移による高色純度の発光を示す量子ドット材料を得た.合成した各色の多元系半導体量子ドットを使った量子ドットEL(Electroluminescence)素子を試作し,その発光特性を評価・分析することで,色鮮やかなEL発光を実現するための素子構造など条件を見いだした.各色…
View article: Photoluminescence Redshift of AgInS<sub>2</sub> Quantum Dots by Employing Shells with Graded Composition
Photoluminescence Redshift of AgInS<sub>2</sub> Quantum Dots by Employing Shells with Graded Composition Open
Silver indium sulfide (AIS)/gallium sulfide (Ga–S) core/shell QDs exhibit a narrow band-edge photoluminescence (PL) in the yellow color region, and shifting the PL wavelength is crucial for optical applications. In this study, we attempt t…
View article: Promoting Oxygen Reduction Reaction by Excitation of Localized Surface Plasmon of Shape‐ and Facet‐Controlled Octahedral Au@Pt Core‐Shell Nanocrystals
Promoting Oxygen Reduction Reaction by Excitation of Localized Surface Plasmon of Shape‐ and Facet‐Controlled Octahedral Au@Pt Core‐Shell Nanocrystals Open
Much attention has been paid to the development of high‐performance electrocatalytic reactions by exploiting the plasmonic properties of noble metal nanoparticles. In this study, ultrathin Pt layers with different coverage ratios were prep…
View article: Facile High-Yield Synthesis of Ag–In–Ga–S Quaternary Quantum Dots and Coating with Gallium Sulfide Shells for Narrow Band-Edge Emission
Facile High-Yield Synthesis of Ag–In–Ga–S Quaternary Quantum Dots and Coating with Gallium Sulfide Shells for Narrow Band-Edge Emission Open
Among cadmium-free quantum dots (QDs), ternary or quaternary chalcogenide semiconductor QDs composed of groups 11, 13, and 16 elements have extensively been studied. Herein, monodispersed quaternary nanoparticles of silver indium gallium s…
View article: One-pot synthesis of Ag–In–Ga–S nanocrystals embedded in a Ga<sub>2</sub>O<sub>3</sub> matrix and enhancement of band-edge emission by Na<sup>+</sup> doping
One-pot synthesis of Ag–In–Ga–S nanocrystals embedded in a Ga<sub>2</sub>O<sub>3</sub> matrix and enhancement of band-edge emission by Na<sup>+</sup> doping Open
Ag–In–Ga–S nanocrystals embedded in a Ga 2 O 3 matrix produced a narrow band-edge photoluminescence, the intensity being significantly enlarged by Na + doping, and they effectively served as an emitting layer in green quantum dot-light-emi…
View article: Multifunctional Magnetic CuS/Gd<sub>2</sub>O<sub>3</sub> Nanoparticles for Fluorescence/Magnetic Resonance Bimodal Imaging-Guided Photothermal-Intensified Chemodynamic Synergetic Therapy of Targeted Tumors
Multifunctional Magnetic CuS/Gd<sub>2</sub>O<sub>3</sub> Nanoparticles for Fluorescence/Magnetic Resonance Bimodal Imaging-Guided Photothermal-Intensified Chemodynamic Synergetic Therapy of Targeted Tumors Open
Chemodynamic therapy (CDT), which consumes endogenous hydrogen peroxide (H2O2) to generate reactive oxygen species (ROS) and causes oxidative damage to tumor cells, shows tremendous promise for advanced cancer treatme…
View article: Development of plasmonic thin-layer chromatography for size-selective and optical-property-dependent separation of quantum dots
Development of plasmonic thin-layer chromatography for size-selective and optical-property-dependent separation of quantum dots Open
Nano-objects, such as quantum dots (QDs), are essential units for the construction of functional materials and devices in current technologies. The establishment of a versatile scheme to sort desired components from a crude product is cruc…
View article: Optical trapping of nanoparticles in superfluid helium
Optical trapping of nanoparticles in superfluid helium Open
Although nanoparticles have been used to study the properties of superfluid helium as fluid tracers, the interaction between nanoparticles and superfluid helium has remained largely unexplored. This is due to the lack of a technique to pre…
View article: Surface ligand chemistry on quaternary Ag(In<sub><i>x</i></sub>Ga<sub>1−<i>x</i></sub>)S<sub>2</sub> semiconductor quantum dots for improving photoluminescence properties
Surface ligand chemistry on quaternary Ag(In<sub><i>x</i></sub>Ga<sub>1−<i>x</i></sub>)S<sub>2</sub> semiconductor quantum dots for improving photoluminescence properties Open
The photoluminescence properties of Ag(In x Ga 1− x )S 2 quaternary semiconductor quantum dots are improved by ligand exchange with L-, X-, and Z-type ligands. Analyses of both the quantum dots and byproducts are performed for understandin…
View article: CCDC 2108084: Experimental Crystal Structure Determination
CCDC 2108084: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Optical force mapping at the single-nanometre scale
Optical force mapping at the single-nanometre scale Open
Three-dimensional (3D) information of the optical response in the nanometre scale is important in the field of nanophotonics science. Using photoinduced force microscopy (PiFM), we can visualize the nano-scale optical field using the optic…
View article: [Paper] Green Electroluminescence Generated by Band-edge Transition in Ag-In-Ga-S/GaS<sub><i>x</i></sub> Core/shell Quantum Dots
[Paper] Green Electroluminescence Generated by Band-edge Transition in Ag-In-Ga-S/GaS<sub><i>x</i></sub> Core/shell Quantum Dots Open
Quantum-dot light-emitting diodes (QD-LEDs) that exhibit green emission were fabricated using Ag-In-Ga-S/GaSx (AIGS) core/shell QDs as low-toxicity QDs. Although multi-element QDs such as AIGS are prone to broad-wavelength defect-induced e…
View article: Hot electron transfer in Zn–Ag–In–Te nanocrystal–methyl viologen complexes enhanced with higher-energy photon excitation
Hot electron transfer in Zn–Ag–In–Te nanocrystal–methyl viologen complexes enhanced with higher-energy photon excitation Open
Zn–Ag–In–Te nanocrystals exhibited hot electron transfer to adsorbed methyl viologen, the efficiency being enhanced from 45% to 72% with an increase in the excitation photon energy.
View article: Controlling the oxidation state of molybdenum oxide nanoparticles prepared by ionic liquid/metal sputtering to enhance plasmon-induced charge separation
Controlling the oxidation state of molybdenum oxide nanoparticles prepared by ionic liquid/metal sputtering to enhance plasmon-induced charge separation Open
MoOx NPs, prepared by sputtering Mo metal on a room-temperature ionic liquid (RTIL) followed by heating in air, produced anodic photocurrents with the excitation of their LSPR peak.
View article: Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots
Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots Open
Highly luminescent silver indium sulfide (AgInS2) nanoparticles were synthesized by dropwise injection of a sulfur precursor solution into a cationic metal precursor solution. The two-step reaction including the formation of silver sulfide…
View article: Non-destructive dispersion of quantum dots into gases
Non-destructive dispersion of quantum dots into gases Open
We report on our experimental results for the nondestructive dispersion of CdSe/ZnS core-shell quantum dots and ZnS-AgInS2 solid solution quantum dots into buffer gases by using a nebulizer. By monitoring scattering light from droplets and…
View article: Narrow band-edge photoluminescence from AgInS2 semiconductor nanoparticles by the formation of amorphous III–VI semiconductor shells
Narrow band-edge photoluminescence from AgInS2 semiconductor nanoparticles by the formation of amorphous III–VI semiconductor shells Open
Silver indium sulfide (AgInS2) semiconductor nanoparticles are cadmium-free quantum dots emitting in visible to near infrared regions. The present study demonstrates the narrowing of their broad defect emission by coating AgInS2 core nanop…
View article: Electrocatalyst: Pt‐Nanoparticle‐Supported Carbon Electrocatalysts Functionalized with a Protic Ionic Liquid and Organic Salt (Adv. Mater. Interfaces 3/2018)
Electrocatalyst: Pt‐Nanoparticle‐Supported Carbon Electrocatalysts Functionalized with a Protic Ionic Liquid and Organic Salt (Adv. Mater. Interfaces 3/2018) Open
This image illustrates the Pt-nanoparticle-supported carbon electrocatalysts for the oxygen reduction reaction produced using a Pt-nanoparticle-monodispersed ionic liquid with an electrochemically-polymerizable protic organic salt. More de…
View article: Labeling and in vivo visualization of transplanted adipose tissue-derived stem cells with safe cadmium-free aqueous ZnS coating of ZnS-AgInS2 nanoparticles
Labeling and in vivo visualization of transplanted adipose tissue-derived stem cells with safe cadmium-free aqueous ZnS coating of ZnS-AgInS2 nanoparticles Open
The facile synthesis of ZnS-AgInS 2 (ZAIS) as cadmium-free QDs and their application, mainly in solar cells, has been reported by our groups. In the present study, we investigated the safety and the usefulness for labeling and in vivo imag…
View article: Nanostructure Engineering of Size-Quantized Semiconductor Particles for Photoelectrochemical Applications
Nanostructure Engineering of Size-Quantized Semiconductor Particles for Photoelectrochemical Applications Open
Semiconductor nanoparticles of several nanometers in size that exhibit the quantum size effect have recently been called “quantum dots”. Their unique physicochemical properties, which are different from those of bulk material or molecules,…