A5054505930- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Thermal properties of materials
- Advanced Thermoelectric Materials and Devices
- 2D Materials and Applications
- Conducting polymers and applications
- Carbon Nanotubes in Composites
- Graphene research and applications
- Magnetism in coordination complexes
- Heat Transfer and Optimization
- Organic Electronics and Photovoltaics
- MXene and MAX Phase Materials
- Photochromic and Fluorescence Chemistry
- Crystallography and molecular interactions
- Advanced Chemical Physics Studies
- Thermal Radiation and Cooling Technologies
- Luminescence and Fluorescent Materials
- Quantum and electron transport phenomena
- Dyeing and Modifying Textile Fibers
- Laser-Matter Interactions and Applications
- Thermography and Photoacoustic Techniques
- Chalcogenide Semiconductor Thin Films
- Various Chemistry Research Topics
- Metal complexes synthesis and properties
- High voltage insulation and dielectric phenomena
Tokyo Metropolitan University
2019-2024
National Institute of Advanced Industrial Science and Technology
2024
The University of Tokyo
2018-2021
National Institute for Materials Science
2018-2020
Innovation Research Center
2020
Material (Belgium)
2020
Tokyo University of Science
2012-2017
RIKEN
2014
Abstract Self-organization in π -conjugated polymers gives rise to a highly ordered lamellar structure, which inter-chain stacking spontaneously forms two-dimensional conjugated sheets. This multi-layer stacked nature of semicrystalline allows the inclusion various functional molecules. In particular, redox-triggered ion-intercalation is an ideal system for molecular doping, extremely high charge carrier density has been achieved. Here, we conducted detailed structural analysis and electron...
A comprehensive understanding of the roles various nanointerfaces in thermal transport is critical significance but remains challenging. two-dimensional van der Waals (vdW) heterostructure with tunable interface lattice mismatch provides an ideal platform to explore correlation between properties and achieve controllable tuning heat flow. Here, we demonstrate that interfacial engineering efficient strategy tune via systematic investigation conductance (G) across a series large-area...
Abstract Tungsten disulfide (WS 2 ) nanotubes exhibit various unique properties depending on their structures, such as diameter and wall number. The development of techniques to prepare WS with the desired structure is crucial for understanding basic properties. Notably, synthesis characterization multi-walled small diameters are challenging. This study reports small-diameter an average inner 6 nm. optical absorption photoluminescence (PL) spectra as-prepared indicate that a decrease in...
Transition metal dichalcogenide (TMDC) nanotubes exhibit unique physical properties due to their nanotube structures. The development of techniques for synthesizing TMDC with controlled structures is very important science and applications. However, structural control efforts have been made only the homostructures not heterostructures that provide an platform two-dimensional counterparts. In this study, we synthesized nanotubes, MoS2/WS2 heteronanotubes, demonstrated a technique controlling...
Polymorphic transition from the 1D ribbon to 2D carpet superstructure of squaric acid molecules on Au(111) was achieved through a thermally activated process. Our combined STM and DFT study revealed that molecular arrangements in superstructures are determined by stability their conformational isomers assembled structures, respectively.
Single crystals of squarylium dyes with substituted alkyl chains were categorized into four types based on their structural characteristics.
Recent advancement in high-power mid-infrared lasers has facilitated the investigation of extreme nonlinear optical phenomena solids, which exhibit unconventional behaviors owing to strong light–matter interactions. High-harmonic generation (HHG) is a typical phenomenon that generates harmonics through nonperturbative processes. Herein, laser field tunnels charged particles from valence conduction band and induces their carrier motion along band, then high harmonics. In this study, we...
Crystalline semiconducting polymers can be chemically doped with molecular dopants via integer charge transfer to highly conductive states, where carriers in high-mobility, semicrystalline undergo band-like transport. Although coherent, transport characteristics are indispensable for further improvement of conductivity, the correlation between and crystallinity conjugated has not been comprehensively studied. Here, we investigate role molecular-doped thiophene-based regioisomers. The doping...
Thermoelectric conversion, which is the generation of electricity from waste heat, can play an important role in renewable energy use. Lowering dimensionality semiconductor thermoelectric materials a promising approach for improving performance, and ultimately one-dimensional (1D) have potential to exhibit maximized performance because presence 1D electronic structure, such as van Hove singularity (vHs) density states. However, experimentally verifying effect nature on nanomaterials has been...
The presence of hopping carriers and grain boundaries can sometimes lead to anomalous carrier types density overestimation in Hall-effect measurements. Previous studies on carbon nanotube films reported unreasonably large densities without independent assessments the densities. Here, we have systematically investigated validity results for a series metallic, semiconducting, metal-semiconductor-mixed single-wall films. With controlled through applied gate voltages, were able observe Hall...
Abstract Crystal structures of eight derivatives bis(diphenylglyoximato)–nickel(II), bearing four alkoxy chains different lengths, were determined by single-crystal X-ray crystallography. Sequential transition packing chain elongation was observed. The typically one-dimensional columnar structure comprising metal wires, herringbone structures, quasi-layered and layered having an interdigitation alkyl moieties in the chains. Each structural characteristic depends on odd–even effect...
Understanding the relationships between thermal conductivity and carrier density in thin films is of great importance for management flexible film electronics. Here, we report a robust measurement technique to tune evaluate their cross-plane conductivities simultaneously. We employed time-domain thermoreflectance method using an Au transducer evaluated situ electrolyte gating with ionic gel. The proposed this study elucidated among above-mentioned parameters semiconducting single-walled...
The crystal structure of the triethylammonium salt 3-carboxymethyl-5-[2-(3-decyl-2-benzothiazolidene)ethylidene]-2-thioxo-4-thiazolidinone was determined by X-ray crystallography. compound crystallized in a triclinic system, space groups P1 and Z = 2 with cell parameters 11.7107(13)Å, b 15.5659(17)Å, c 15.9742(17)Å, α 89.029(2)°, β 84.925(2)°, γ 76.510(2)°, V 2820.4(5)Å3. refined to final values R1 0.0970 wR2 0.2460. A negative charge assisted hydrogen bond (-)CAHB between carboxyl found.
Understanding the relationship between electrical and thermal characteristics of thin films is crucial for their management. However, there are hardly any reliable experimental data on this because measurement methods that can evaluate both in same direction very limited. Here, we report a technique simultaneously by combining time-domain thermoreflectance vertical electrolyte-gated transistors. We demonstrate conductivity single-walled carbon nanotube independent current density, which...
Precise evaluation of the thermophysical properties thin films is crucial for realizing high-performance flexible electrical and energy devices. The ultrafast laser-based time-domain thermoreflectance (TDTR) method one most effective methods examining attached to metals; however, conventional TDTR are mainly employed an aluminum transducer layer, which not used metal electrodes. Here, we developed a system designed gold transducer, typical electrode in electronic devices, evaluated carbon...
van der Waals (vdW) interface is a critical component in the performance of flexible devices, such as electronics, thermal, and thermoelectric devices. Recent advances design with two-dimensional (2D) materials have allowed for studying various controlled properties. Understanding heat charge transport correlation essential optimizing device performance. However, due to experimental limitations, between characteristics across 2D vdW interfaces has not yet been elucidated. Here, we revealed...
The structure of 4,4′-bi(3-(1-methylethoxy)-3-cyclobutene-1,2-dione) was determined by X-ray crystallography. A symmetry operation (-x+1, -y+1, -z+2) generated the whole molecule. compound crystallised in a monoclinic system and characterised as follows: P21/c, = 5.6929(5)Å, b 13.3409(13)Å, c 9.5865(9)Å, β 106.414(2)°, Z 2, V 698.41(11)Å3. crystal solved direct method refined full-matrix least-squares on F2 to obtain final values R1 0.0423 wR2 0.00894. carbon-carbon (C-C) bond lengths...