A5005348783- Advanced Thermoelectric Materials and Devices
- Landslides and related hazards
- Chalcogenide Semiconductor Thin Films
- Hydrology and Sediment Transport Processes
- Thermal properties of materials
- Quantum Dots Synthesis And Properties
- Surfactants and Colloidal Systems
- Advanced Battery Materials and Technologies
- Block Copolymer Self-Assembly
- Magnetic properties of thin films
- Protein Structure and Dynamics
- Advanced Thermodynamics and Statistical Mechanics
- Fuel Cells and Related Materials
- 2D Materials and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Soil erosion and sediment transport
- Advanced Photocatalysis Techniques
- Conducting polymers and applications
- Magnetic Properties and Synthesis of Ferrites
- Hydrology and Watershed Management Studies
- Hydraulic flow and structures
- Characterization and Applications of Magnetic Nanoparticles
- Membrane Separation Technologies
- Membrane-based Ion Separation Techniques
- Antibiotic Resistance in Bacteria
National Sun Yat-sen University
2015-2024
National Yunlin University of Science and Technology
2024
Ming Chi University of Technology
2022-2024
National Chung Hsing University
2024
Huaiyin Normal University
2019-2023
Sun Yat-sen University
2007-2023
Institute of Physics, Academia Sinica
2012-2022
Academia Sinica
2009-2017
California Institute of Technology
2013-2015
National Defense Medical Center
2014-2015
Doped polycrystalline SnSe could have <italic>zT</italic> 0.6 at 750 K, suggesting good potential for thermoelectrics. Challenges come from difficulty in doping and hysteresis resistivity.
Temperature dependences of the magnetic susceptibility $\ensuremath{\chi}$ and heat capacity ${C}_{p}$ CdSe quantum dots with size $d=2.8$, 4.1, 5.6 nm are compared to those bulk determine size-dependent effects. With decreasing $d$, following effects observed: (i) room temperature optical absorption shows a blueshift band gap; (ii) x-ray diffraction show wurtzite structure but smaller lattice constants; (iii) changes from negative (diamagnetic) for positive magnitude increasing $d$; (iv)...
Bismuth telluride-based thermoelectric (TE) materials are historically recognized as the best p-type (ZT = 1.8) TE at room temperature. However, poor performance of n-type (ZT≈1.0) counterparts seriously reduces efficiency device. Such imbalance severely impedes its applications either in electrical generation or refrigeration. Here, a strategy to boost Bi
Development of supramolecular adhesives with strong tolerance to extreme conditions has emerged as an important research area. In this study, by balancing interactions such hydrogen bonding interactions, electrostatic π-π stacking and cation-π we designed prepared a series two-component derived from small organic molecules. Highly efficient interfacial adhesion maximum strength ≈10.0 MPa was realized on various surfaces in air, solvents, or liquid nitrogen. Owing balanced water participation...
Phosphorus has been regarded as one of the most promising next-generation lithium-ion battery anode materials, because its high theoretical specific capacity and safe working potential. However, shuttle effect sluggish conversion kinetics hamper practical application. To overcome these limitations, we decorated SnO2 nanoparticles at surface phosphorus using an electrostatic self-assembly method, in which can participate discharge/charge reaction, Li2O formed chemically adsorb suppress...
An ultrahigh zT of 2.7 at 700 K is achieved in a (Ge 0.86 Sb 0.08 Bi 0.06 )Te single crystal. This outstanding performance attributed to one-dimensional-like electronic structure and the resulting strong electron–phonon interaction.
Resistance to sheet flows over natural turf surface is investigated experimentally. The formulation of a functional relationship between the resistance coefficient and controlling parameters for shallow various surfaces essential mathematical modeling rainfall-runoff process sediment yield from watershed which may consist vegetated surfaces. An analysis results obtained laboratory experiments laminar flow on Kentucky Blue grass Bermuda reveals that exists Darcy-Weisbach friction coefficient,...
To elucidate low-dimensional effects on thermoelectric materials, bismuth telluride film and nanowires array were fabricated by potentiostatically electrodeposition. Both materials are slightly Te-rich, n-type Bi2Te3, exhibiting preferred orientation in rhombohedral strcture. For both the Seebeck coefficient S ≈ −70 μV/K at 300 K decreases linearly with decreasing temperature, showing a diffusive nature of current flow. The temperature dependence resistivity (=1/σ) obtained from data...
The strategy for shape control of alloy FePt nanocrystal was studied systematically. By the careful adjustments reaction parameters in a solution reaction, surfactant−facet bindings on growth seed were controlled delicately. octapod, cuboctahedron, truncated cube, and nanocube successfully prepared from cuboctahedral examined by high-resolution transmission electron microscopy. formations nanostructures mainly attributed to differences rate between {111} {100} planes seeds. magnetic...
A record high zT of 2.2 at 740 K is reported in Ge0.92Sb0.08Te single crystals, with an optimal hole carrier concentration ≈4 × 1020 cm-3 that simultaneously maximizes the power factor (PF) ≈56 µW cm-1 K-2 and minimizes thermal conductivity ≈1.9 Wm-1 K-1. In addition to presence herringbone domains stacking faults, exhibits significant modification phonon dispersion extra excitation around ≈5-6 meV Γ point Brillouin zone as confirmed through inelastic neutron scattering (INS) measurements....
Interfacial adhesion under extreme conditions has attracted increasing attention owing to its potential application of stopping leakages oil or natural gas. However, interfacial is rarely stable at ultralow temperatures and in organic solvents, necessitating the elucidation molecular-level processes. Herein, we used intermolecular force-control strategy prepare four linear polymers by tuning proportion hydrogen bonding number electrostatic sites. The obtained polymeric ion liquids displayed...
Abstract In this work, a high thermoelectric figure of merit, zT 1.9 at 740 K is achieved in Ge 1−x Bi x Te crystals through the concurrent Seebeck coefficient enhancement and thermal conductivity reduction with dopants. The substitution for not only compensates superfluous hole carriers pristine GeTe but also shifts Fermi level ( E F ) to an eligible region. Experimentally, moderate 6–10% dopants, carrier concentration drastically decreased from 8.7 × 10 20 cm −3 3–5 boosted three times 75...
β-Zn4Sb3 is a promising thermoelectric material due to its environmental friendliness and suitability for mid-temperature applications. However, maintaining pure β-phase during fabrication remains significant challenge, as phase instabilities often degrade performance. Here, we demonstrate the successful optimization of thin films through controlled Sn doping using ion beam-assisted deposition. By precisely regulating concentration at 0.97 %, preserved, resulting in maximum power factor 1.4...
For nominal 3 and 9 nm FePt nanoparticles coated with oleylamine/oleic acid having a face-centred-cubic (fcc) structure, temperature variations (5–300 K) of magnetization M, ac susceptibility χ' χ'' for the frequency range fm = 0.1–1000 Hz electron magnetic resonance (EMR) spectra at 9.28 GHz are reported. X-ray diffraction samples shows fcc structure lattice constant 3.84 A TEM characterization yields log-normal distributions particle sizes average D 3.15(0.16) nm 8.70(0.12) nm 3 nm...
This paper presents the dispatch of reactive power compensation and real curtailment photovoltaic (PV) systems to prevent overvoltage violation when load transfer between distribution feeders is executed. The voltage sensitivity factors injection at all PV buses are derived according configuration network. advanced automation system issues control command each inverter for adjustment generation, coefficients installation capacity, so that ancillary service support can be provided by in a...
Abstract Spark plasma sintering (SPS) is currently widely applied to existing alloys as a means of further enhancing the alloys’ figure merit. However, determination optimal condition challenging in SPS process. This report demonstrates systematic way independently optimize Seebeck coefficient S and ratio electrical thermal conductivity (σ/κ) thus achieve maximum merit zT = 2 (σ/κ)T. Sb 2−x In x Te 3 (x 0–0.2) were chosen examples validate method. Although high temperature pressure are...
Structural parameters and electronic band gaps of dense TiO2 polymorphs, i.e., α-PbO2, baddeleyite, fluorite, cotunnite types structures, were calculated using a first-principles density functional method with local-density approximation. The ambient phases, rutile anatase, known theoretical experimental data used to ensure the validity calculations. fluorite-type turned out have narrowest gap, 1.08 or 2.18 eV after applying very approximate gap correction, due highly symmetrical TiO8...