A5021235230- 2D Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- Chalcogenide Semiconductor Thin Films
- Transition Metal Oxide Nanomaterials
- Ga2O3 and related materials
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Metal and Thin Film Mechanics
- Advancements in Battery Materials
- GaN-based semiconductor devices and materials
- Electronic and Structural Properties of Oxides
- Quantum Dots Synthesis And Properties
- Nanowire Synthesis and Applications
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Organic Light-Emitting Diodes Research
- Electrocatalysts for Energy Conversion
- Diamond and Carbon-based Materials Research
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
Ajou University
2016-2025
Suwon Research Institute
2016-2020
Government of the Republic of Korea
2018-2020
Pohang University of Science and Technology
2005-2018
Max Planck Institute for Biophysical Chemistry
2014-2018
University of Göttingen
2015-2018
Institute of Physical Chemistry
2016
Max Planck Society
2014
Two-dimensional systems such as surfaces and molecular monolayers exhibit a multitude of intriguing phases complex transitions. Ultrafast structural probing offers direct time-domain information on internal interactions couplings to substrate or bulk support. We have developed ultrafast low-energy electron diffraction investigate in transmission the relaxation polymer/graphene bilayer system excited out equilibrium. The laser-pump/electron-probe scheme resolves melting polymer superstructure...
RuO2 nanorods on electrospun carbon nanofibers were simply grown by precipitation and recrystallization methods for studying their capacitive behaviors supercapacitor applications. Recrystallization heat treatment is carefully performed at various temperatures: 180, 220, 300 °C. Under optimal growth conditions, application of RuO2-carbon annealed 220 °C with a very low loading concentration Ru as the electrode material in KOH aqueous electrolyte leads to good capacitance capability 188 F g–1...
A nanostructured three-dimensional (3D) electrode using transparent conducting oxide (TCO) is an effective approach for increasing the efficiency of optoelectronic devices used in daily life. Tin-doped indium (ITO) a representative TCO with high conductivity and work function anode applications. This paper reports fabrication large-area ITO nanostructure branch shape electron beam evaporation process at temperatures as low 80 °C, which was free any carrier gas catalyst. The large surface to...
We present a simple approach to improving the quality of CVD grown graphene, exploiting Cu(111) foil catalyst. The catalyst is epitaxially by evaporation on single crystal sapphire substrate, thickened electroplating, and peeled off. exposed surface atomically flat, easily reduced, exclusively (111) orientation. Graphene this under atmospheric conditions without wet chemical prereduction produces domain sizes several hundred micrometers in samples that are many centimeters size. graphene...
Monolayer graphene field-effect sensors operating in liquid have been widely deployed for detecting a range of analyte species often under equilibrium conditions. Here we report on the real-time detection binding kinetics essential human enzyme, topoisomerase I interacting with substrate molecules (DNA probes) that are immobilized electrochemically to monolayer strips. By monitoring characteristics biosensor during enzyme–substrate interactions, able decipher surface constant cleavage...
A novel one‐dimensional (1D) inorganic material, Nb 2 Se 9 , which can be separated into atomic‐level, is synthesized through chemical reaction between and sources. crystals are formed under an excess condition to avoid other phase such as NbSe 3 the residual removed by heat treatment; thus, high‐purity obtained. The one‐atom‐thick level nanochains successfully obtained mechanical exfoliation dispersion in a solvent. covalently bonded chain, when isolated from its three‐dimensional bulk...
Unproperly treated industrial waste creates serious environmental pollution that requires immediate remediation strategies. Non-woven polyester fabrics are widely used in a variety of applications; thus, their debris becomes major portion waste. To contribute to advanced treatment processes, this study investigated catalytic thermal non-woven fabric on novel ultrahigh-porosity MgO material under CO2 environment. The was synthesized from hydromagnesite via series reactions, having surface...
A silicon-based anode is one of the most promising materials for high-current-density lithium-ion batteries (LIBs). However, volume expansion pure Si and complex synthesis SiOx make their practical application challenging. On other hand, SiO2, as another alternative to Si-based anodes, has attractive properties such high theoretical capacity, abundance elements, cost-effectiveness, mechanical strength. Nevertheless, due its intrinsic poor electrochemical activity lithiation, it challenging...
Co-solvent exfoliation of quasi-1D van der Waals Nb 2 Pd 3 Se 8 using ethanol–water and isopropanol–water mixtures as a substitute to the conventional, toxic, high-boiling point NMP solvent.
The light out-coupling efficiency of OLEDs is enhanced by the use a refractive index modulation layer (RIML) with MgO nanofacet structure (see figure) that can be formed without an additional lithographic or patterning processes. Increases in luminance and power up to 19% 34.7%, respectively, are demonstrated. Low one main limitations highly efficient OLEDs, so overcoming it would allow substantial improvements.
Abstract We report the growth mechanism of metal oxide nanostructures synthesized by electron beam evaporation. The condensed can easily decompose sources that have a high melting point, thereby creating self-catalytic nanodot for vapor-liquid-solid process. be grown at temperature just above point self-catalyst dissolving oxygen. morphology nanostructures, such as density and uniformity, strongly depends on surface energy migration substrate. nanodots increased with decreasing energies...
Abstract The presence of unwanted impurities in graphene is known to have a significant impact on its physical and chemical properties. Similar carbon nanotubes, any trace metals present will affect the electrocatalytic properties material. Here, we show by direct electroanalysis that traces copper still remain transferred CVD (chemical vapor deposition)‐grown (even after usual etching process) strongly influence electrochemical Subsequently, use real‐time procedure remove more than 90 %...
The excitation spectrum of graphene on Cu(111), probed by momentum-resolved electron-energy-loss spectroscopy, exhibits multiple acoustic surface plasmons (ASP), arising from both the overlayer and Cu(111) substrate. We have investigated mutual interaction between ASP that underlying weak implies survives, with only slight changes in its group velocity. Remarkably, we find damping processes are mitigated as compared to cases other graphene/metal interfaces. Therefore, this interface is an...
Abstract In this work, high‐quality 1D van der Waals (vdW) Nb 2 Pd 3 Se 8 is synthesized, showing an excellent scalability from bulk to single‐ribbon due weakly bonded repeating unit ribbons. The calculation of electronic band structures confirmed that novel a semiconducting material, displaying indirect‐to‐direct bandgap transition with decreasing the number unit‐ribbons single. Field effect transistors (FETs) fabricated on mechanically exfoliated nanowires exhibit n‐type transport...
A transparent and flexible film capable of shielding electromagnetic waves over a wide range frequencies (X Ku bands, 8-18 GHz) is prepared. The wave fabricated using the excellent transmittance, electrical conductivity, thermal stability indium tin oxide (ITO), representative conductive oxide. inherent mechanical brittleness ceramics overcome by adopting nanobranched structure. In addition, maintained even after repeated bending experiments (200 000 times). produced applied to practical GHz...
Humanity is confronting significant environmental issues due to rising energy demands and the unchecked use of fossil fuels. Thus, strategic employment sustainable environmentally friendly sources becoming increasingly vital. Additionally, addressing challenges, such as low reactivity, suboptimal efficiency, restricted selectivity, requires development innovative catalysts. Two-dimensional (2D) covalent organic frameworks (COFs), known for their limitless structural versatility, are proving...
Abstract Nanostructured vertical light‐emitting diodes (V‐LEDs) with a very dense forest of vertically aligned ZnO nanowires on the surface N‐face n‐type GaN are reported dramatic improvement in light extraction efficiency (∼3.0×). The structural transformation (i.e., dissociation nitrogen atoms) at nanolevel by UV radiation and Ozone treatments contributes significantly to initial nucleation for growth due interdiffusion Zn into GaN, evident scanning photoemission microscopy (SPEM),...