A5100676667- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Sensor and Energy Harvesting Materials
- Advanced Battery Technologies Research
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Polymer composites and self-healing
- Electronic and Structural Properties of Oxides
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Electrospun Nanofibers in Biomedical Applications
- Semiconductor materials and devices
- ZnO doping and properties
- Multilevel Inverters and Converters
- Advanced DC-DC Converters
- Ferroelectric and Negative Capacitance Devices
- Copper-based nanomaterials and applications
- Polydiacetylene-based materials and applications
- Catalytic Alkyne Reactions
- Advanced Combustion Engine Technologies
- Carbon dioxide utilization in catalysis
- Advanced Memory and Neural Computing
- Supramolecular Self-Assembly in Materials
Dongguk University
2025
Chungnam National University
2024
Korea Institute of Energy Research
2024
Ewha Womans University
2010-2023
Gyeongsang National University
2021-2023
Ulsan National Institute of Science and Technology
2023
Seoul National University of Science and Technology
2016-2022
Korea Advanced Institute of Science and Technology
2020-2022
Gyeongnam National University of Science and Technology
2020-2021
Samsung (South Korea)
2020
Abstract Flexible fibrous supercapacitors (FFS) are considered the next‐generation wearable energy storage devices because they provide reliable safety, eco‐friendliness, and high power density. In particular, FFS is desirable for application to electronics it can overcome disadvantages of lithium‐ion battery (LIB), such as hazard explosion complex manufacturing process. Nevertheless, practical continues be inhibited by poor performance due limited specific surface area, electrical...
Abstract Polydiacetylenes (PDAs), a family of conjugated polymers, are very intriguing materials in several aspects. Especially, the stimulus‐induced apparent blue‐to‐red transition PDAs has led to development variety PDA‐based chemosensors. In current work, we synthesized PDA monomers bearing trimethyl amine (PCDA‐DMEDA) and incorporated them with Poly(ethylene oxide) (PEO) into electrospun fibers. For first time, successfully demonstrated that fibers can be used for naked‐eye detection HCl...
We report the synthesis of KNbO(3) nanowires (NWs) with a monoclinic phase, phase not observed in bulk materials. The NWs can be synthesized via hydrothermal method using metallic Nb as precursor. are metastable, and thermal treatment at ∼450 °C changed into orthorhombic which is most stable room temperature. Furthermore, we fabricated energy-harvesting nanogenerators by vertically aligning on SrTiO(3) substrates. showed significantly better energy conversion characteristics than NWs....
Fiber/textile-based wearable electronics have been commercialized in recent years with high-tech functions, handy size, and light weight. Most of these devices, however, can be re-charged only through an external electric connection. This feature has raised concerns for the implementation devices advanced applications where standalone are needed. In spite necessity a self-charging capability, there limitations to implement directly built on bulk textile, falling into dependence energy...
Applying nanoscale device fabrications toward biomolecules, ultra sensitive, selective, robust, and reliable chemical or biological microsensors have been one of the most fascinating research directions in our life science. Here we introduce hierarchically driven iridium dioxide (IrO(2)) nanowires directly on a platinum (Pt) microwire, which allows simple fabrication amperometric sensor shows favorable electronic property desired for sensing hydrogen peroxide (H(2)O(2)) dihydronicotinamide...
Abstract Zinc‐ion batteries (ZIBs) have emerged as a promising energy storage solution due to their inherent safety, environmental sustainability, and cost‐effectiveness. Utilizing water‐based electrolytes, ZIBs eliminate fire risks thermal runaway concerns, making them ideal for large‐scale systems. The high theoretical capacity, low cost, abundance, toxicity of zinc further enhance its suitability grid‐scale applications. However, conventional current collectors such graphite foil exhibit...
DMF-based polyurethanes for wet-type polyurethane artificial leather were prepared using 4,4<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:msup><mml:mrow/><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:math>-diphenylmethane diisocyanate (MDI) as diisocyanate, 1,4-butanediol (BD)/1,6-hexanediol (HD) chain extender, and four different macroglycols (MW: 2000): poly(butylene/3-methyl-pentylene adipate) glycol based on 1,4-butanediol/3-methyl-1,5-pentanediol (MPD),...
The dependence of band intensities in the Raman spectrum individual single-crystal ruthenium dioxide (RuO2) nanowires on angle between plane polarization exciting (and collected) light and long axis nanowire, is shown to be a simple, complementary technique high resolution transmission electron microscopy (HRTEM) for determining nanowire growth direction. We show that excellent agreement exists what observed predicted nanowires’ Eg (525 cm−1) B2g (714 bands, only by assuming grow along (001)...
We report a facile growth route to synthesize hierarchically grown single crystalline metallic RuO2 nanowires on electrospun IrO2 nanofibres via combination of simple vapour phase transport process with an electrospinning process. This synthetic strategy could be extended design variety highly branched network architectures functional hetero-nanostructures possible future applications.
The nanostructured iridium–ruthenium mixed metal oxide (IrxRu1–xO2, 0 ≤ x 1) is the most promising candidate as a highly efficient electrode material for electrolysis of water. We present facile synthesis and structural characterization single crystalline IrxRu1–xO2 nanowires first time via simple vapor phase transport process by carefully controlling relative ratios IrO2 RuO2 precursors. also observed that an Eg mode nanowire measured from Raman scattering being linearly blue shifted its...
Wearable or patchable biosensors have attracted tremendous attention due to their continuous health-monitoring capabilities. In particular, self-powered passive based on a piezoelectric nanogenerator (PENG) demonstrated measurements of physiological signals from which cardiovascular information can be analyzed such as heart rate and blood pressure. However, challenges still remain with regard both material device aspects. For the effective accurate measurement extremely weak signals, various...
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We report a new strategy in the use of graphene layers as template for remarkably enhancing growth single crystalline one-dimensional (1-D) nanostructures and selectively controlling area. Single RuO2 nanowires high density were almost exclusively obtained over large area that had been transferred onto SiO2/Si(100) substrate within 20 min. This rational engineering is promising technique producing very dense 1-D nanomaterials areas various applications.
Abstract Drug disposal and abuse are increasing every year, the use of drugs has recently reached its peak due to COVID‐19. However, there still remains a lack awareness regarding proper waste medications, if not properly disposed of, these complex chemical structures can have severe environmental impacts. Furthermore, as this contains chemically valuable substances, recycling strategy is needed. To address issue, potential reusing expired commercial acetaminophen tablets freeze‐dried (FAP)...
Abstract We present the synthesis of highly crystalline metallic rhenium trioxide (ReO 3 ) nanowires via a simple physical vapor transport at 300 °C for first time. Based on HRTEM, ReO exhibit core perfect cubic perovskite‐type single crystal structure with shell thin amorphous and disordered structures less than 2 nm in near surface layers. Possibly this is due to proton intercalation induced by reaction water. magnified image (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The objective of this study was to determine the effective compressive strength a column-slab connection with different strengths between column and slab concrete. A total eight specimens were fabricated, among which four restrained by slabs while others did not have any slab, test results compared current design codes. According ACI 318, can be used as in when ratio concrete is less than 1.4. Even case, however, showed that decreased. specimen its slab-column zone reinforced steel fibers an...
This paper proposes a high step-up resonant converter which is suitable for low power application. The proposed simple in structure since it employs only one switch while not necessitating clamp circuit. Also, the able to achieve ZCS turn-on and turn-off of diodes, resulting efficiency. Furthermore, has reduced transformer volume due guaranteed zero dc-offset current transformer. Experimental results on 250W prototype are provided validate concept.