A5052469015- Graphene research and applications
- Advancements in Battery Materials
- Thermochemical Biomass Conversion Processes
- Radiation Detection and Scintillator Technologies
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor materials and devices
- Advanced Battery Materials and Technologies
- GaN-based semiconductor devices and materials
- Lignin and Wood Chemistry
- Catalysis and Hydrodesulfurization Studies
- Gas Sensing Nanomaterials and Sensors
- 2D Materials and Applications
- Microstructure and mechanical properties
- Semiconductor materials and interfaces
- Fusion materials and technologies
- Ga2O3 and related materials
- Medical Imaging Techniques and Applications
- Metal and Thin Film Mechanics
- Biofuel production and bioconversion
- Nuclear Materials and Properties
- Conducting polymers and applications
- Analytical Chemistry and Sensors
- Guidance and Control Systems
- Graphene and Nanomaterials Applications
- ZnO doping and properties
Dankook University
2023-2025
Seoul National University
2013-2024
Advanced Institute of Convergence Technology
2019-2021
Sungkyunkwan University
2021
Seoul Institute
2017-2019
Government of the Republic of Korea
2019
University of Seoul
2018-2019
Iowa State University
2014-2019
Korea University
2019
Eastern Regional Research Center
2017-2018
Previously, the primary product distribution resulting from fast pyrolysis of cellulose, hemicellulose, and lignin was quantified. This study extends analysis to examinations interactions between cellulose–hemicellulose cellulose–lignin, which were determined by comparing products their native mixture, physical superposition individual components. Negligible found for both binary mixtures. For no significant interaction identified either. In case cellulose–lignin herbaceous biomass exhibited...
Cycle stability of solid-state lithium batteries (SSLBs) using a LiCoO2 cathode is improved by atomic layer deposition (ALD) on active material powder with Al2O3. SSLBs LiCoO2/Li3.15Ge0.15P0.85S4/77.5Li2S-22.5P2S5/Li structure were constructed and tested charge-discharge cycling at current density 45 μA cm−2 voltage window 3.3 ∼ 4.3 V (vs. Li/Li+). Capacity degradation during suppressed dramatically employing Al2O3 ALD-coated in the composite cathode. Whereas only 70% capacity retention...
We report an ultraclean, cost-effective, and easily scalable method of transferring patterning large-area graphene using pressure sensitive adhesive films (PSAFs) at room temperature. This simple transfer is enabled by the difference in wettability adhesion energy with respect to PSAF a target substrate. The PSAF-transferred found be free from residues shows excellent charge carrier mobility as high ∼17,700 cm(2)/V·s less doping compared transferred thermal release tape (TRT) or poly(methyl...
There have been rapidly increasing demands for flexible lighting apparatus, and micrometer-scale light-emitting diodes (LEDs) are regarded as one of the promising sources deformable device applications. Herein, we demonstrate a method creating LED, based on remote heteroepitaxy GaN microrod (MR) p-n junction arrays c-Al2O3 wafer across graphene. The use graphene allows transfer MR LED onto copper plate, spatially separate offer ideal geometry suitable in various shapes without serious...
Although lignin is one of the main components biomass, its pyrolysis chemistry not well understood due to complex heterogeneity.
Detection of ppb level ammonia at room temperature is demonstrated using chemically fluorinated graphene oxide (CFGO). Fluorine adatom extremely enhances sensing capabilities through the changes charge distributions on adjacent functional groups, resulting in variation gas adsorption energies.
Abstract Intrinsically stretchable organic light‐emitting diodes (ISOLEDs) are becoming essential components of wearable electronics. However, the efficiencies ISOLEDs have been highly inferior compared with their rigid counterparts, which is due to lack ideal electrode materials that can overcome poor charge injection at 1D metallic nanowire/organic interfaces. Herein, efficient use graphene‐based 2D‐contact electrodes (TCSEs) incorporate a graphene layer on top embedded nanowires...
It is important to increase the energy density of olivine-type cathode materials utilizing micro-sized particles for rechargeable lithium batteries. However, according literature, LiMn1−xFexPO4 compounds have limited specific capacity because they exhibit lower electrical conductivity than nano-sized materials: isolation inner part from electrolyte results in an electrochemically inactive area during cycling, which hinders proper Li+ transport that causes failure micron-sized particles. To...
Recent development in mobile electronic devices and electric vehicles requires electrical wires with reduced weight as well enhanced stability. In addition, since energy is mostly generated from power plants located far its consuming places, mechanically stronger higher transmission cables are strongly demanded. However, there has been no alternative materials that can practically replace copper materials. Here, we report a method to prepare ultrastrong graphene fibers (GFs)–Cu core–shell...
A new solid-state Li ion conductor composed of LiBH4 and Al2O3 was synthesized by a simple ball-milling process. The element distribution map obtained transmission electron microscopy demonstrates that the are well mixed form large interface after ball-milling. ionic conductivity mixture reaches as high 2 × 10–4 S cm–1 at room temperature when volume fraction is approximately 44%. between extracted using continuum percolation model, which turns out to be about 10–3 temperature, being 105...
Abstract 2D materials, such as graphene, exhibit great potential functional materials for numerous novel applications due to their excellent properties. The grafting of conventional micropatterning techniques on new types electronic devices is required fully utilize the unique nature graphene. However, lithography and polymer‐supported transfer methods often induce contamination damage graphene surface polymer residues harsh wet‐transfer conditions. Herein, a strategy obtain micropatterned...
Plan-view and cross-sectional transmission electron microscopy images show the microstructural properties of GaN thin films grown on graphene layers, including dislocation types density, crystalline orientation grain boundaries. The roles ZnO nanowalls intermediate layers in heteroepitaxial growth graphene, revealed by microscopy, are also discussed.
Unprecedented hydrogen detection at room temperature by Au nanoclusters supported on a self-activated graphene microchannel is demonstrated.
Abstract Three central themes in the study of phenomenon resistive switching are nature conducting phase, why it forms, and how forms. In this study, answers to all three questions provided by performing experiments situ a transmission electron microscope on thin films model system polycrystalline SrTiO 3 . On basis high‐resolution microscopy, electron‐energy‐loss spectroscopy current–voltage measurements, phase is identified be SrTi 11 O 20 This only observed at specific grain boundaries,...
An acid–base bifunctional catalyst was synthesized by treating a natural mixed-metal oxide, serpentine, with sulfuric acid. Catalyst characterization revealed that the number of acidic and basic sites increased after acid treatment largely due to an increase in surface area. However, stronger were also introduced formation bridged hydroxyl groups between Si atom heteroatom, as inferred H NMR NH3-TPD analysis. Results from SEM-EDS 1H suggested base close proximity. Catalytic conversions...