A5063421879- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Polydiacetylene-based materials and applications
- Silk-based biomaterials and applications
- Gas Sensing Nanomaterials and Sensors
- Transition Metal Oxide Nanomaterials
- Graphene research and applications
- 2D Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Advanced Memory and Neural Computing
- Molecular Junctions and Nanostructures
- Advanced Materials and Mechanics
- Carbon Nanotubes in Composites
- Lipid Membrane Structure and Behavior
- Carbon Dioxide Capture Technologies
- MXene and MAX Phase Materials
- Membrane-based Ion Separation Techniques
- Membrane Separation Technologies
- Advanced Battery Materials and Technologies
- Force Microscopy Techniques and Applications
- Adsorption and Cooling Systems
- Hydrogen Storage and Materials
- Covalent Organic Framework Applications
- Catalytic Processes in Materials Science
Incheon National University
2016-2021
Government of the Republic of Korea
2019-2020
Incheon Medical Center
2020
Silks are protein-based natural structured materials with an unusual combination of high strength and elongation. Their unique microstructural features composed hard β-sheet crystals aligned within a soft amorphous region lead to the robust properties silks. Herein we report large enhancement in intrinsic silk through transformation basic building blocks into poly-hexagonal carbon structure by simple heat treatment axial stretching. The clusters originating from retain preferred orientation...
Thermally reducible pyroprotein-based electronic textiles (e-textiles) are fabricated using graphene oxide and a pyroprotein such as cocoon silk spider web without any chemical agents. The electrical conductivity of the e-textile is 11.63 S cm-1 , which maintained even in bending, washing, temperature variation.
An electronic textile-based NO2 gas sensor was fabricated using commercial silk and graphene oxide (GO). It showed a fast response time excellent sensing performance, which simply accomplished by modifying the heat-treatment process. The heat treatment conducted at 400 °C different heating rates of 1, 3, 5 °C/min. Compared with our previous research, significantly decreased, from 32.5 to 3.26 min, we found that highest obtained treated rate 1 To find reason for this enhanced morphology,...
We report improved conductance by reducing the work function via incorporation of hydrogen into VO2 nanowires. The nanowires were prepared using chemical vapor deposition method with V2O5 powder on silicon substrates at 850 °C. Hydrogenation was carried out high-pressure hydrogenation method. Raman spectroscopy confirmed that incorporated atoms resulted in a change lattice constant (NWs). To quantitatively measure nanowires, Kelvin probe force microscopy (KPFM) employed ambient conditions....
Twisted bilayer graphene (tBLG) is two stacked single sheets rotated at a specific angle. The twist angle plays an important role in the physical properties of tBLG. In this study, we analyzed interaction distance between layers tBLG using Raman spectroscopy and atomic force microscopy. To confirm upper bottom graphenes tBLG, prepared tBLGs with angles 5° 24°. interlayer was controlled by depositing gold bar layers. We found that decoupling different depending on (0.74 nm for 1.66 24°). This...
A reduction in the electronic-dimensionality of materials is one method for achieving improvements material properties. Here, a demonstrated using simple hydrogen treatment technique. Quantum well states from hydrogen-treated bulk 2H-MoS2 are observed angle resolved photoemission spectroscopy (ARPES). The electronic confined within few MoS2 layers after treatment. significant band-gap can also be achieved treatment, and both phenomena explained by formation sulfur vacancies generated...
Electronic textiles (e-textiles) are being developed because of their potential applications in wearable and flexible electronics. However, complex procedures chemical agents required to synthesize carbon-based e-textiles. Pyroprotein-based e-textiles, obtained by the pyrolysis silk proteins, consume large amounts time energy due high-temperature process (from 800 2800 °C). In this study, we report a novel method fabricating pyroprotein-based electronic yarns (e-yarns) using microwave...
We investigated the gas storage capacity of thermally carbonized and chemically activated Phyllostachys bambusoides (PB), which is a nature-derived green carbon with an organic porous structure. Samples were treated at 900 °C for 24 h, then different amounts KOH. The pore distribution, surface area, H2 measured by N2 sorption, up to 847 mmHg (1.13 bar) 77 K. CO2 was 298 maximum shown in sample 6 times gravimetric ratio chemical agent. It reached 1.86 wt% 3.44 mmol/g CO2. used multilateral...
In the oxidative dehydrogenation (ODH) process that converts ethylbenzene to styrene, vanadium-based catalysts, especially V2O5, are used in a CO2 atmosphere enhance efficiency. Here we demonstrate activation energy of V2O5 can be manipulated by exposure high pressure CO2, using nanowires (VON). The oxidation V4+ V5+ was observed X-ray photoelectron spectroscopy. ratio V4+/V5+ which typical comparable feature decreased 73.42%. We also found an increase interlayer distance VON from 9.95 Å...
Temperature-dependent charge transport properties of pyroprotein-based electronic yarns fabricated from pyrolysis commercial silk with different heat treatment temperatures were analyzed for the first time.
High-performance carbon-based electronic textiles have recently been considered as the potential components for low-cost, multifunctional flexible and wearable electronics. Although many promising results reported to fabricate carbon textiles, they are not adoptable current textile industry, such as, nylon, cotton, polyester, silk due their chemical stability. Here, we report a facile way prepare fully conductive, flexible, stable reduced graphene oxide (RGO)-based from yarns fabrics using...