A5101684614- 2D Materials and Applications
- Graphene research and applications
- Organic Electronics and Photovoltaics
- Thin-Film Transistor Technologies
- Advanced Memory and Neural Computing
- MXene and MAX Phase Materials
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Semiconductor materials and devices
- Perovskite Materials and Applications
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Synthesis of Ferrites
- Multiferroics and related materials
- 3D Printing in Biomedical Research
- Advanced SAR Imaging Techniques
- Advancements in Battery Materials
- Nanowire Synthesis and Applications
- Acoustic Wave Resonator Technologies
- Advanced Sensor and Energy Harvesting Materials
- Ferroelectric and Negative Capacitance Devices
- Bone Tissue Engineering Materials
- Metal-Organic Frameworks: Synthesis and Applications
- biodegradable polymer synthesis and properties
- Covalent Organic Framework Applications
- Quantum and electron transport phenomena
Sungkyunkwan University
2013-2025
Kangwon National University
2021-2025
Animal and Plant Quarantine Agency
2025
Samyang Holdings (South Korea)
2025
Chung-Ang University
2024
Korea University
2004-2024
University of Alabama
2010-2024
Keimyung University
2013-2024
Massachusetts Institute of Technology
2018-2024
Agency for Defense Development
2021-2024
Although polycrystalline hexagonal boron nitride (PC-hBN) has been realized, defects and grain boundaries still cause charge scatterings trap sites, impeding high-performance electronics. Here, we report a method of synthesizing wafer-scale single-crystalline hBN (SC-hBN) monolayer films by chemical vapor deposition. The limited solubility (B) nitrogen (N) atoms in liquid gold promotes high diffusion adatoms on the surface at temperature to provoke circular grains. These further evolve into...
Monolayer MoS2, among many other transition metal dichalcogenides, holds great promise for future applications in nanoelectronics and optoelectronics due to its ultrathin nature, flexibility, sizable band gap, unique spin-valley coupled physics. However, careful study of these properties at low temperature has been hindered by an inability achieve low-temperature Ohmic contacts monolayer particularly carrier densities. In this work, we report a new contact scheme that utilizes cobalt (Co)...
We report the synthesis of centimeter-scale, uniform 1T'- and 2H-MoTe2 thin films via tellurization Mo films. 1T'-MoTe2 was initially grown converted gradually to over a prolonged growth time under Te atmosphere. Maintaining excessive essential for obtaining stable stoichiometric phase. Further annealing lower partial pressure at same temperature, followed by rapid quenching, led reverse phase transition from 1T'-MoTe2. The orientation film determined rate. Slow key highly oriented entire...
Hexagonal boron nitride (h-BN) has recently been in the spotlight due to its numerous applications including being an ideal substrate for two-dimensional electronics, a tunneling material vertical devices, and growth template heterostructures. However, obtain large area of h-BN film while maintaining uniform thickness is still challenging not realized. Here, we report systematical study on Pt foil by using low pressure chemical vapor deposition with borazine source. The monolayer was...
Hollow microporous organic networks (H-MONs) were prepared by a template method using silica spheres. The shell thickness was delicately controlled changing the synthetic conditions. H-MONs used as for synthesis of nanoparticulate Co3O4 hollows which showed excellent catalytic performance in H2O2 oxidation.
We report the synthesis of centimeter-scale monolayer WS2 on gold foil by chemical vapor deposition. The limited tungsten and sulfur solubility in allows film growth surface. To ensure coverage uniformity film, source-coated substrate was placed parallel with Au under hydrogen sulfide atmosphere. high temperature near 935 °C helps to increase a domain size up 420 μm. Gold is reused for repeatable after bubbling transfer. WS2-based field effect transistor reveals an electron mobility 20 cm2...
Successful synthesis of room-temperature ferromagnetic semiconductors, Zn$_{1-x}$Fe$_{x}$O, is reported. The essential ingredient in achieving ferromagnetism bulk Zn$_{1-x}$Fe$_{x}$O was found to be additional Cu doping. A transition temperature as high 550 K obtained Zn$_{0.94}$Fe$_{0.05}$Cu$_{0.01}$O; the saturation magnetization at room reached a value $0.75 \mu_{\rm B}$ per Fe. Large magnetoresistance also observed below $100 $K.
Abstract We introduce a nanoporous membrane suitable for virus filtration with good dimensional stability under high pressures maintaining selectivity. The consists of double layer: upper layer is film pore size ∼17 nm and thickness ∼160 nm, which was prepared by polystyrene‐ block ‐poly(methyl methacrylate) copolymer (PS‐ b ‐PMMA) where PMMA removed ultraviolet irradiation followed rinsing acetic acid. combined conventional micro‐filtration to enhance mechanical strength. employed in this...
Contrasting magnetic properties were obtained from bulk Mn-doped ZnO synthesized under different processing conditions. While a ferrimagnetic phase transition was observable in Zn0.95Mn0.05O sample processed at 1170 K, no such found for with the same composition 1370 K. The detailed magnetic, structural, and spectroscopic studies of these two samples have revealed that former is attributable to secondary phase, (Mn,Zn)Mn2O4, system. For latter higher temperature, detected major feature...
Tubes from tubes: Microporous organic nanotubes were prepared by Sonogashira coupling between tetrakis(4-ethynylphenyl)methane and N,N′-di(4-iodophenyl)-4,4′-bipyridinium dichloride. These used as a template for secondary inorganic materials, namely Fe2O3 with high discharge capacity excellent stability. Detailed facts of importance to specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted the...
Tiny pores: Benzodifuran moieties were introduced into microporous organic networks (MONs) through a tandem process consisting of Sonogashira coupling 1,3,5-triethynylbenzene and 2,5-diiodo-1,4-hydroquinone intramolecular cyclization. The resultant benzodifuran-containing MON showed promising photocatalytic activities in the oxidative conversion primary amines imines.
Solid‐state conversion of single crystals from polycrystalline materials has the advantages cost‐effectiveness, chemical homogeneity, and versatility over conventional melt growth solution methods, particularly for systems with high melting points, incongruent melting, reactivity (volatility), phase transformations at temperature. Nevertheless, commercial production, this technique only been successful in a few limited systems, particular ferroelectric systems. This is mostly because...
Bioengineered artificial blood vessels have been a major area of interest over the last decade. Of particular are small diameter vessels, as surgical options currently limited. This study aimed to fabricate diameter, heterogeneous bilayer vessel-like construct in single step with gelatin methacryloyl (GelMA) bioink using 3D micro-extrusion bioprinter on solid platform. GelMA was supplemented Hyaluronic acid (HA), glycerol and form good printability, mechanical strength, biocompatibility. Two...
A van der Waals (vdW) Schottky junction between two-dimensional (2D) transition metal dichalcogenides (TMDs) is introduced here for both vertical and in-plane current devices: diodes semiconductor field-effect transistors (MESFETs). The barrier conducting NbS2 semiconducting n-MoS2 appeared to be as large ∼0.5 eV due their work-function difference. While the diode shows an ideality factor of 1.8–4.0 with on-to-off ratio 103−105, Schottky-effect MESFET displays little gate hysteresis ideal...
Manipulating materials with atomic-scale precision is essential for the development of next-generation material design toolbox. Tremendous efforts have been made to advance compositional, structural, and spatial accuracy deposition patterning. The family 2D provides an ideal platform realize atomic-level architectures. wide rich physics these led fabrication heterostructures, superlattices, twisted structures breakthrough discoveries applications. Here, we report a novel tool that...
Memristors are promising candidates for constructing neural networks. However, their dissimilar working mechanism to that of the addressing transistors can result in a scaling mismatch, which may hinder efficient integration. Here, we demonstrate two-terminal MoS2 memristors work with charge-based similar transistors, enables homogeneous integration realize one-transistor-one-memristor addressable cells assembling programmable The homogenously integrated implemented 2 × network array enabled...