A5100643800- Advanced Surface Polishing Techniques
- Diamond and Carbon-based Materials Research
- Advanced machining processes and optimization
- Advanced biosensing and bioanalysis techniques
- 2D Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor materials and devices
- Graphene research and applications
- MXene and MAX Phase Materials
- Metallurgical Processes and Thermodynamics
- Metal and Thin Film Mechanics
- Gas Sensing Nanomaterials and Sensors
- Molecular Junctions and Nanostructures
- Nanowire Synthesis and Applications
- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Conducting polymers and applications
- Aerosol Filtration and Electrostatic Precipitation
- Photonic and Optical Devices
- Electrochemical sensors and biosensors
- Adhesion, Friction, and Surface Interactions
- Advanced Fiber Optic Sensors
- Analytical Chemistry and Sensors
- Advanced materials and composites
- Surface Roughness and Optical Measurements
Sungkyunkwan University
2016-2025
Korea University Medical Center
2025
Ministry of Food and Drug Safety
2011-2024
National Institute of Food and Drug Safety Evaluation
2011-2024
Hyundai Steel (South Korea)
2024
Korea Research Institute of Ships and Ocean Engineering
2019-2024
National Institute of Environmental Research
2011-2024
Advanced Institute of Convergence Technology
2024
Kyungpook National University
2023-2024
Institute of Nanotechnology
2010-2023
The antimicrobial activity of silver nanoparticles has resulted in their widespread use many consumer products. However, despite the continuing increase population exposed to nanoparticles, effects prolonged exposure have not been thoroughly determined. Accordingly, this study attempted investigate inflammatory responses and pulmonary function changes rats during 90 days inhalation nanoparticles. were (18 nm diameter) at concentrations 0.7 x 10(6) particles/cm(3) (low dose), 1.4 particles...
By plasma-enhanced chemical vapor deposition, a molybdenum disulfide (MoS2 ) thin film is synthesized directly on wafer-scale plastic substrate at below 300 °C. The carrier mobility of the films 3.74 cm(2) V(-1) s(-1) . Also, humidity successfully detected with MoS2 -based sensors fabricated flexible substrate, which reveals its potential for sensing devices.
New hydrophilic 2D graphene oxide (GO) nanosheets with various oxygen functional groups were employed to maintain high sensitivity in highly unfavorable environments (extremely humidity, strong acidic or basic). Novel one-headed polymer optical fiber sensor arrays using GO and hydrophobic reduced (rGO) carefully designed, leading the selective sensing of volatile organic gases for first time. The two physically different surfaces rGO could provide ability distinguish between tetrahydrofuran...
Phosphorus-doped double-layered graphene field-effect transistors (PDGFETs) show much stronger air-stable n-type behavior than nitrogen-doped FETs (NDGFETs), even under an oxygen atmosphere, due to strong nucleophilicity, which may lead real applications for channels. Detailed facts of importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by the authors. Please note: The publisher...
The structure-viscosity relationship of the low-silica (SiO2 ≤ 10 wt%) calcium aluminosilicate melts, which represent secondary refining ladle slag systems, was investigated by employing rotating-cylinder viscosity measurement in conjunction with Raman spectroscopy for linking macroscopic thermophysical property and molecular (ionic) structural information. Furthermore, influence CaF2 on structure-property explored. melts decreased increasing both CaO/Al2O3 CaO/SiO2 ratios. However, effect...
Various functional materials, such as metal nanoparticles, carbon nanotubes and conducting polymers were coated on polymer microspheres finding various uses in electronic biomedical applications. Herein, we demonstrate that single graphene oxide (GO) sheets could be easily wrapped amine-functionalized poly(glycidyl methacrylate) (PGMA-ed) (∼2.5 μm diameter) to form a PGMA-ed/GO core-shell structure with thickness of ca. 50 nm. Subsequently, the synthesized GO-skin consolidated by heating...
The metallic 1T phase of WS2 (1T-WS2 ), which boosts the charge transfer between electron source and active edge sites, can be used as an efficient electrocatalyst for hydrogen evolution reaction (HER). As semiconductor 2H (2H-WS2 ) is inherently stable, methods synthesizing 1T-WS2 are limited complicated. Herein, a uniform wafer-scale film prepared using plasma-enhanced chemical vapor deposition (PE-CVD) system. growth temperature maintained at 150 °C enabling direct synthesis films on both...
Using tungsten disulfide (WS2) as a hydrogen evolution reaction (HER) electrocatalyst brought on several ways to surpass its intrinsic catalytic activity. This study introduces nanodomain oxide (WO3) interface 1T-WS2, opening new route for facilitating the transfer of proton active sites, thereby enhancing HER performance. After H2S plasma sulfurization W layer realize nanocrystalline subsequent O2 treatment led formation amorphous WO3 (a-WO3), resulting in patchwork-structured...
Earth-abundant and inexpensive transition metal dichalcogenides (TMDCs) with existing polymorphisms (metallic 1T phase semiconducting 2H phase) have been proposed as alternatives to noble metals (e.g., Pt, Ir, Ru) achieve an efficient hydrogen evolution reaction (HER). Although the of TMDCs (1T-TMDCs) is essential HER catalyst, practical application in has not realized owing lack any large-scale production 1T-TMDC 1T/1T-TMDC heterostructure fabrication method. Here, polymorphic TMDC–TMDC...
Abstract Brain‐inspired parallel computing is increasingly considered a solution to overcome memory bottlenecks, driven by the surge in data volume. Extensive research has focused on developing memristor arrays, energy‐efficient strategies, and varied operational mechanisms for synaptic devices enable this. However, realize truly biologically plausible neuromorphic computing, it essential consider temporal spatial aspects of input signals, particularly systems based leaky integrate‐and‐fire...
Mesoporous metal oxides exhibit excellent physicochemical properties and are widely used in various fields, including energy storage/conversion, catalysis, sensors. Although several soft-template approaches reported, high-temperature calcination for both oxide formation template removal is necessary, which limits direct synthesis on a plastic substrate flexible devices. Here, universal synthetic approach that combines thermal activation oxygen plasma to synthesize diverse mesoporous (V
Abstract Layered molybdenum disulphide was grown at a low-temperature of 350 °C using chemical vapour deposition by elaborately controlling the cluster size. The under various sulphur-reaction-gas to molybdenum-precursor partial-pressure ratios were examined. Using spectroscopy and microscopy, effect size on layered growth investigated in terms morphology, grain size, impurity incorporation. Triangular single-crystal domains an optimized ratio. Furthermore, it is proved that nucleation sites...
In order to improve the electrochemical performance of NiCo2O4 material, Ni ions were partially substituted with Cu2+ having excellent reducing ability. All electrodes fabricated by growing Ni1−xCuxCo2O4 electrode spinel-structural active materials onto graphite felt (GF). Five types electrodes, NiCo2O4/GF, Ni0.875Cu0.125Co2O4/GF, Ni0.75Cu0.25Co2O4/GF, Ni0.625Cu0.375Co2O4/GF, and Ni0.5Cu0.5Co2O4/GF, prepared for application oxygen evolution reaction (OER). As substituted, performances...
Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted considerable attention owing to their synergetic effects with other 2D materials, such as graphene and hexagonal boron nitride, in TMD-based heterostructures. Therefore, it is important understand the physical properties of TMD–TMD vertical heterostructures for applications next-generation electronic devices. However, conventional synthesis process has some critical limitations, nonreproducibility low yield. In this...
The conventional synthesis of two-dimensional (2D) transition metal dichalcogenide (TMDC) heterostructures is low yielding and lack the heterojunction interface quality. chemical vapor deposition (CVD) techniques have achieved high-quality heterostructure interfaces but require a high temperature (>600 °C) yield heterostructures. Therefore, large scale quality TMDC heterojunctions using low-temperature methods are in demand. Here, high-quality, wafer-scale MoS2 WS2 with 2D were prepared by...