A5102013662- Advanced Thermoelectric Materials and Devices
- Thermal properties of materials
- 2D Materials and Applications
- Nanowire Synthesis and Applications
- Semiconductor materials and interfaces
- ZnO doping and properties
- Molten salt chemistry and electrochemical processes
- GaN-based semiconductor devices and materials
- Quantum and electron transport phenomena
- Graphene research and applications
- Ferroelectric and Piezoelectric Materials
- Chalcogenide Semiconductor Thin Films
- Magnetic properties of thin films
- Thermal Radiation and Cooling Technologies
- Acoustic Wave Resonator Technologies
- TiO2 Photocatalysis and Solar Cells
- Microfluidic and Bio-sensing Technologies
- Extraction and Separation Processes
- Ga2O3 and related materials
- Analytical Chemistry and Sensors
- Advanced biosensing and bioanalysis techniques
- Advanced Sensor and Energy Harvesting Materials
- MRI in cancer diagnosis
- Transition Metal Oxide Nanomaterials
- Physics of Superconductivity and Magnetism
Chung-Ang University
2016-2025
Berry (India)
2025
Kyungpook National University Medical Center
2025
Kyungpook National University
2000-2024
Advanced Institute of Materials Science
2019-2021
Tohoku University
2019-2021
Chonnam National University
2011-2021
Winston-Salem State University
2021
Government of the Republic of Korea
2017-2020
Institute for Materials Research, Tohoku University
2020
High-quality gallium nitride nanowires have been synthesized via metal-initiated metalorganic chemical vapor deposition for the first time. Excellent substrate coverage was observed wires prepared on silicon, c-plane, and a-plane sapphire substrates. The were formed vapor−liquid−solid mechanism with gold, iron, or nickel as growth initiators found to widths of 15-200 nm. Transmission electron microscopy confirmed that single-crystalline oriented predominantly along [210] [110] direction....
Quantum wire lasers are generally fabricated through complex overgrowth processes with molecular beam epitaxy. The material systems of such overgrown quantum wires have been limited to Al−Ga−As−P, which leads emission largely in the visible region. We describe a simple, one-step chemical vapor deposition process for making based on Al−Ga−N system. A novel quantum-wire-in-optical-fiber (Qwof) nanostructure was obtained as result spontaneous phase separation at nanometer scale one dimension....
We report on the optical and electrical transport properties of single-crystalline silicon carbide nanowires (SiC NWs). The NWs were fabricated by a chemical vapor deposition process, had diameters <100nm lengths several μm. X-ray diffraction transmission electron microscopy analysis showed nature with growth direction ⟨111⟩. Photoluminescence characterization blue emission at room temperature. measurements from field effect transistor structure individual n-type semiconductor...
We report on the development of a nanowire substrate-enabled laser scanning imaging cytometry for rare cell analysis in order to achieve quantitative, automated, and functional evaluation circulating tumor cells. Immuno-functionalized arrays have been demonstrated as superior material capture cells from heterogeneous populations. The method enables large-area, automated quantitation captured rapid cellular parameters (e.g., size, shape, signaling protein) at single-cell level. This...
The Seebeck effect refers to the production of an electric voltage when different temperatures are applied on a conductor, and corresponding voltage-production efficiency is represented by coefficient. We report effect: thermal generation driving from heat flowing in thin PtSe2/PtSe2 van der Waals homostructure at interface. refer as interface-induced effect. By exploiting this directly attaching multilayered PtSe2 over high-resistance films hybridized single structure, we obtained highly...
Control of living cells on biocompatible materials or modified substrates is important for the development bio-applications, including biosensors and implant biomaterials. The topography hydrophobicity highly affect cell adhesion, growth, growth kinetics, which great importance in bio-applications. Herein, we investigate morphology cultured breast cancer a silicon substrate, graphene oxides (GO) was partially formed. By minimizing size amount GO-containing solution further annealing process,...
We report on the multiple ZnO nanowires field-effect transistors (FETs), which were formed by assembling as-synthesized a SiO2/Si substrate using an optimized alternating current (AC) dielectrophoresis (DEP) technique in three-probe back-gate geometry. The AC DEP was with bias voltage of 10 Vp-p at frequency kHz. Our FETs containing ca. 50∼65 one device exhibited excellent electrical characteristics transconductance 3∼11.5 μS drain 1∼5 V, mobility ∼30 cm2/V·s, and carrier concentration 9.4 ×...
Silicon nanowires (SiNWs) offer promising inorganic nanostructures for biomedical application. Here, we report the development of a novel SiNW array designed isolating primary CD4+ T lymphocytes from heterogeneous mixture cell populations. Our system employed specific high-affinity binding features streptavidin (STR)-functionalized with biotin-labeled lymphocytes. Fabricated arrays easily separated mouse whole splenocytes over ∼88% purity and demonstrated tight attachment to by scanning...
The electrolytic extraction of liquid copper at 1105°C from a molten sulfide electrolyte composed 57 wt% BaS and 43 Cu2S was investigated. DC cyclic voltammetry, Fourier transformed AC galvanostatic electrolysis revealed that the electrodeposition is possible in selected electrolyte. half wave potential for reaction on graphite determined, high purity obtained by electrolysis. These preliminary results confirm sulfides free alkaline elements could be used as an faradaic applications, despite...
Recently, significant progress has been made in increasing the figure-of-merit (ZT) of various nanostructured materials, including thin-film and quantum dot superlattice structures. Studies have focused on size reduction control surface or interface materials since these approaches enhance thermopower phonon scattering Currently, bismuth–tellurium-based semiconductor are widely employed for thermoelectric (TE) devices such as TE energy generators coolers, addition to other sensors, use at...
Steam generation by eco-friendly solar energy has immense potential in terms of low-cost power generation, desalination, sanitization, and wastewater treatment. Herein, highly efficient steam a bilayer generator (BSSG) is demonstrated, which comprised large-area SnSe–SnSe2 layer deposited on glassy carbon foam (CF). Both CF possess high photothermal conversion capabilities low thermal conductivities. The combined system cumulatively converts input light into heat through phonon-assisted...
Abstract We have studied structural and electrical properties of one dimensionally grown single crystalline gallium nitride (GaN) nanowires (NWs) for nanoscale devices using a metal‐initiated metal‐organic chemical vapor deposition (MOCVD). GaN were formed via the vapor‐liquid‐solid (VLS) mechanism with gold, iron, or nickel as growth initiators found to triangular cross‐sections widths 15 ∼ 200 nm lengths 5 20 μm. TEM confirmed that well oriented along [210] [110] direction on substrate...
Background Intravenous nicorandil infusion with percutaneous coronary intervention (PCI) has been reported to reduce reperfusion injury events and improve cardiac function in patients acute myocardial infarction (MI). However, there is limited information on the use of intracoronary nicorandil. Methods Results In present study, 73 ST segment elevation MI undergoing PCI were randomly assigned Nicorandil Group (n=37) or Control (n=36). The composite endpoints incidences ventricular arrhythmia,...
The effects of grain size and strain on the temperature-dependent thermal transport antimony telluride (Sb2Te3) thin films, controlled using post-annealing temperatures 200°C to 350°C, were investigated 3-omega method. measured total conductivities 400-nm-thick films annealed at 200°C, 250°C, 300°C, 320°C, 350°C determined be 2.0 3.7 W/m · K in 20 300 temperature range. We found that film size, rather than strain, had most prominent effect reduction conductivity. To confirm experimental...
Recently, low-dimensional superlattice films have attracted significant attention because of their low dimensionality and anisotropic thermoelectric (TE) properties such as the Seebeck coefficient, electrical conductivity, thermal conductivity. For these structures, both electrons phonons show highly behavior exhibit much stronger interface scattering in out-of-plane direction compared to in-plane direction. However, no detailed information is available literature for TE superlattice-based...
Two-dimensional (2D) PtSe2 is rapidly emerging as a promising candidate for developing devices that exhibit significantly enhanced thermoelectric power factor because of its thickness-modulation-induced tunable semiconductor-to-semimetal transition characteristic. This interesting phenomenon motivated us to measure the in-plane Seebeck coefficients and electrical conductivities large-area 2D thin films with approximately 2–15 nm thicknesses. We observed an outstanding coefficient ∼73.7 μV/K...
The intrinsic Berry curvature in ferromagnetic (FM) materials significantly influences Hall conductivity during the antiferromagnetic (AFM)-to-FM phase transition, as demonstrated through anomalous effect (AHE). First-principles calculations indicate negligible spin FeRh AFM due to time-reversal symmetry breaking. To date, contribution of remains unexamined context AHE measurements. This study presents temperature-dependent and carrier transport properties thin films across AFM-to-FM...