A5101436306- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Advanced Cellulose Research Studies
- Quantum Dots Synthesis And Properties
- 2D Materials and Applications
- GaN-based semiconductor devices and materials
- Muscle activation and electromyography studies
- Chalcogenide Semiconductor Thin Films
- Electromagnetic wave absorption materials
- Electrospun Nanofibers in Biomedical Applications
- ZnO doping and properties
- Graphene research and applications
- MXene and MAX Phase Materials
- Nanowire Synthesis and Applications
- Ga2O3 and related materials
- Semiconductor materials and devices
- Nanocomposite Films for Food Packaging
- Ion-surface interactions and analysis
- Semiconductor Quantum Structures and Devices
- Tribology and Wear Analysis
- Material Properties and Applications
- Supercapacitor Materials and Fabrication
- Gas Sensing Nanomaterials and Sensors
- Green IT and Sustainability
- Graphene and Nanomaterials Applications
Yonsei University
2023-2024
Sungkyunkwan University
2021-2023
University of Michigan
2013-2021
Pusan National University
2018-2019
Seoul National University
2013-2017
Korea University of Science and Technology
2015
MagnaChip (South Korea)
2012
Samsung (South Korea)
2011
Jeonbuk National University
2009-2011
Yeungnam University
2011
A bioadhesive triboelectric nanogenerator (BA-TENG), as a first-aid rescue for instant and robust wound sealing ultrasound-driven accelerated healing, is designed. This BA-TENG fabricated with biocompatible materials, integrates flexible TENG the top layer bottom layer, resulting in effective electricity supply strong sutureless capability on wet tissues. When driven by ultrasound, can produce stable voltage of 1.50 V current 24.20 µA underwater. The ex vivo porcine colon organ models show...
Chemical treatment using bis(trifluoromethane) sulfonimide (TFSI) was shown to be particularly effective for increasing the photoluminescence (PL) of monolayer (1L) MoS2, suggesting a convenient method overcoming intrinsically low quantum yield this material. However, underlying atomic mechanism PL enhancement has remained elusive. Here, we report microscopic origin defect healing observed in TFSI-treated 1L-MoS2 through correlative combination optical characterization and atomic-scale...
Implantable medical devices (IMDs) provide practical approaches to monitor physiological parameters, diagnose diseases, and aid treatment. However, device installation, maintenance, long-term implantation increase the risk of infection with conventional IMDs. Therefore, biocompatibility, controllability, miniaturization are highly demandable. An ultrasound-driven, biodegradable, injectable triboelectric nanogenerator (I-TENG) is demonstrated reduce risks implant-related injuries infections....
We have examined the mechanisms of droplet formation and Bi incorporation during molecular beam epitaxy GaAsBi. consider role transition from group-V-rich to group-III-rich conditions, i.e., stoichiometry threshold, in presence Bi. For As-rich GaAsBi growth, acts as a surfactant, leading droplet-free films. films within 10% stoichiometric growth regime, surface Ga droplets are observed. However, for Ga-rich an anti-surfactant, inducing Ga-Bi formation. propose mechanism based upon...
Abstract Diverse touch experiences offer a path toward greater human–machine interaction, which is essential for the development of haptic technology. Recent advances in triboelectricity‐based sensors provide great advantages terms cost, simplicity design, and use broader range materials. Since performance solely relies on level contact electrification between materials, cannot effectively be used to measure extent deformation materials under given mechanical force. Here, an ion‐doped...
Abstract The development of highly tribopositive materials is crucial for realizing high‐performance triboelectric nanogenerators. In this study, a novel protocol to maximize the number non‐bonding electrons with local dipoles designing introduced, and nitrogen‐based dimethylol urea, diazolidinyl imidazolidinyl urea as promising are suggested. mechanism by which provide properties investigated using calculations based on density functional theory. Highly electronegative atoms, such nitrogen...
Piezoelectricity crystallographically exists only in the in-plane direction two-dimensional transition metal dichalcogenides. Here, we demonstrated flexoelectricity-tunable out-of-plane piezoelectricity semiconducting 2H-MoTe2 flakes by creating surface corrugation. In particular, strong and its spatial variation depending on local flexoelectricity was observed even though there piezoelectricity. Surface corrugation-mediated tuning can be applied to other or thin-layered materials and,...
Abstract Implantable electrical neurostimulators offer a promising avenue for treating neurological disorders. However, their dependency on finite battery life limits long‐term utility. Emerging transcutaneous ultrasound‐driven triboelectric nanogenerator (TENG) techniques provide solutions converting external ultrasound waves into internal electricity. This study proposes an implantable TENG (IU‐TENG) using polyether ether ketone (PEEK) its exceptional stability inside human body and...
Abstract In this study, we are introducing a new class of Polyurethane (PU) nanofibers containing silver nanoparticles (NPs) by electrospinning. A simple method not depending on the addition foreign chemicals has been used to self‐synthesize NPs in/on PU nanofibers. Typically, sol−gel consisting AgNO 3 /PU/ N,N ‐dimethylformamide (DMF) electrospun and aged for week, so have created Syntheses were carried out exploiting reduction ability DMF solvent which is main constituent obtain in...
Reduced graphene oxide (RGO) obtained from has received much attention because of its simple and cost-effective manufacturing process. Previous studies have demonstrated the scalable production RGO with relatively high quality; however, irreducible defects on deteriorate unique intrinsic physical properties graphene, such as high-mobility electrical charge transport, limiting potential applicability. Using enhanced chemical reactivity defects, atomic layer deposition (ALD) can be a useful...
A magnetic alloy film/graphite composite is developed for shielding electromagnetic waves in the X-band and extremely low frequency regimes, using a scalable electrodeposition process. Enhanced thermal mechanical properties are also achieved.
Abstract: In order for nanoparticles (NPs) to be applied in the biomedical field, a thorough investigation of their interactions with biological systems is required. Although this growing area research, there paucity comprehensive data cell-based studies. To address this, we analyzed physicomechanical responses human alveolar epithelial cells (A549), mouse fibroblasts (NIH3T3), and bone marrow stromal (HS-5), following interaction silver (AgNPs). When compared kanamycin, AgNPs exhibited...
Abstract With the development of electronic devices and wireless communication technology, quality human life has improved. However, shielding from electromagnetic interference (EMI) is required due to device malfunctions harmful effects on health. Polymer‐based materials getting much attention their light weight, flexibility, good processability, other desirable traits. achieving consistent dispersion conductive fillers optimizing balance between electrical, mechanical, thermal properties...
We have examined the influence of surface Ga nanoparticles (NPs) on enhancement GaAs photoluminescence (PL) efficiency. utilized off-normal focused-ion-beam irradiation surfaces to fabricate close-packed NP arrays. The in PL efficiency is inversely proportional diameter. maximum occurs for diameter predicted maximize incident electromagnetic (EM) field enhancement. driven by plasmon resonance (SPR)-induced EM which overwhelms SPR-induced suppression light emission.
We introduce a novel approach to the seamless integration of plasmonic nanoparticle (NP) arrays into semiconductor layers and demonstrate their enhanced photoluminescence (PL) efficiency. Our utilizes focused ion beam-induced self-assembly close-packed Ga NPs with tailorable NP diameters, followed by overgrowth GaAs using molecular beam epitaxy. Using combination PL spectroscopy electromagnetic computations, we identify regime diameter overgrown layer thickness where NP-array-enhanced...
ZnO nanorods were grown by using the hydrothermal method on p-type Si (100) substrates with nanofibrous seed layers.Before growth, layers spin-coated onto substrates.The structural and optical properties of characterized scanning electron microscopy, X-ray diffraction, photoluminescence.The fibrous is possible due to surface morphology layers.To investigate annealing effects nanorods, post-annealing process was carried out at various temperatures ranging from 300 700 • C under argon...
Microspores, highly ordered, 300–340 nm thick blocks of titanium dioxide (TiO2) nanoparticles (5–10 nm) were deposited on fluorine-doped tin oxide (FTO) glass by using low concentration cellulose nanofibers from bacterial origin, through sol–gel process followed spin coating.
In this paper, using Fourier transform infrared (FTIR) spectroscopy, ion conductivity measurements and first-principle density functional theory (DFT) calculations, we study intermolecular interactions between three molecules (methyl tetrahydrophthalic anhydride (MeTHPA), succinonitrile (SN) plastic crystal, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt) constituting the lithium-ion battery electrolyte. The C–O stretching band position in MeTHPA shifts to a lower frequency order...