A5078173419- Nuclear Materials and Properties
- ZnO doping and properties
- Quasicrystal Structures and Properties
- Nuclear and radioactivity studies
- Gas Sensing Nanomaterials and Sensors
- Diamond and Carbon-based Materials Research
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Perovskite Materials and Applications
- Catalytic Processes in Materials Science
- Fusion materials and technologies
- Carbon Nanotubes in Composites
- Photonic and Optical Devices
- Conducting polymers and applications
- Nuclear reactor physics and engineering
- Viral Infections and Vectors
- Hydrogen Storage and Materials
- Ion-surface interactions and analysis
- Graphene research and applications
- High-pressure geophysics and materials
- Ga2O3 and related materials
- Transition Metal Oxide Nanomaterials
- Solid-state spectroscopy and crystallography
- Intermetallics and Advanced Alloy Properties
- SARS-CoV-2 and COVID-19 Research
Hanyang University
2016-2025
Institute for High Pressure Physics
2025
Korea Atomic Energy Research Institute
2007-2024
University of Maryland, College Park
2024
Seoul National University
2007-2024
Anyang University
2012-2024
Huons (South Korea)
2024
Catholic University of Korea
2010-2023
Korea Institute of Science and Technology
2023
Korean Association Of Science and Technology Studies
2023
Hydrochromic materials have been actively investigated in the context of humidity sensing and measuring water contents organic solvents. Here we report a sensor system that undergoes brilliant blue-to-red colour transition as well 'Turn-On' fluorescence upon exposure to water. Introduction hygroscopic element into supramolecularly assembled polydiacetylene results hydrochromic conjugated polymer is rapidly responsive (<20 μs), spin-coatable inkjet-compatible. Importantly, found be suitable...
In this article the structural and electronic properties of CeO2 Ce1-xZrxO2 nanoparticles are investigated using time-resolved X-ray diffraction, absorption near-edge spectroscopy (XANES), density functional calculations. (x ≤ 0.5) particles in sizes between 4 7 nm were synthesized a novel microemulsion method. The atoms these adopted cubic or pseudocubic crystal structure. lattice constant decreased with increasing Zr content, varying from 5.4019 Å to 5.3066 Ce0.5Zr0.5O2. Within structure,...
Synchrotron-based time-resolved X-ray diffraction was used to study in situ the crystalline phases present during preparation of bulk and silica-supported MoP, Ni2P, MoNiP by reduction oxidic precursors hydrogen. Independent type precursor or presence silica as a support, formation metal phosphides occurs at temperatures between 600 800 °C. Since common species all cases are phosphate-type groups (POx), it seems that their hydrogen is final determining step MoNiP. Silica-stabilized phosphide...
Room-temperature superconductivity has been one of the most challenging subjects in modern physics. Recent experiments reported that lanthanum hydride LaH$_{10{\pm}x}$ ($x$$<$1) raises a superconducting transition temperature $T_{\rm c}$ up to ${\sim}$260 (or 215) K at high pressures around 190 (150) GPa. Here, based on first-principles calculations, we reveal existence topological Dirac-nodal-line (DNL) states compressed LaH$_{10}$. Remarkably, DNLs protected by combined inversion and...
Hierarchical Cu2O/RGO nanocomposites were synthesized via a sustainable photoredox strategy and utilized as bifunctional electrocatalysts for oxygen hydrogen evolution reactions (OER HER) under alkaline conditions. The electrocatalyst has potential electrocatalytic applications, owing to their small overpotentials (OER: 215 mV HER: 142 mV), fast kinetics, Tafel slope of 58.2 dec–1, high mass performance (613.49 A g–1), exchange current density (10.9 mA cm–2), long-term stability, maximum...
Tubular materials formed by self-assembly of small organic molecules find great utility in chemical and material science. Conventional tubular structures often lack stability because noncovalent molecular interactions are responsible for their conformational integrities. Herein we report the development covalently linked chromogenic nanotubes which prepared using topochemical polymerization self-assembled macrocyclic diacetylenes (MCDAs). Crystal five MCDAs having different diameters were...
Crystallization-induced photoluminescence weakening was recently revealed in ultrasmall metal nanoparticles. However, the fundamentals of phenomenon are not understood yet. By obtaining conformational isomer crystals gold nanoclusters, we investigate crystallization-induced and reveal that shortening interparticle distance decreases photoluminescence, which is further supported by high-pressure experiments. To interpret this, propose a distance-dependent non-radiative transfer model...
A previously unknown SARS-CoV-2 vaccine protecting nonhuman primates from challenge was developed using RBD-P2 and N.
In response to the COVID-19 pandemic, different types of vaccines, such as inactive, live-attenuated, messenger RNA (mRNA), and protein subunit, have been developed against SARS-CoV-2. This has unintentionally created a unique scenario where heterologous prime-boost vaccination single virus administered large human population. Here, we aimed analyze whether immunization order vaccine influences efficacy vaccination, especially mRNA protein-based vaccines. We new encoding hemagglutinin (HA)...
An experimental platform for dynamic diamond anvil cell (dDAC) research has been developed at the High Energy Density (HED) Instrument European X-ray Free Electron Laser (European XFEL). Advantage was taken of high repetition rate XFEL (up to 4.5 MHz) collect pulse-resolved MHz diffraction data from samples as they are dynamically compressed intermediate strain rates (≤10 3 s −1 ), where up 352 images can be collected a single pulse train. The set-up employs piezo-driven dDACs capable...
Broadband light absorbers are highly desirable in various applications including solar-energy harvesting, thermo-photovoltaics, and photon detection. The Fabry–Perot (F–P) cavity comprising metal–insulator–metal (MIM) layers has attracted enormous interest as a lithography-free structure for realizing planar super absorbers. However, typical F–P exhibits narrow absorption band, efforts have thus been made to increase the bandwidth. This study demonstrates that near-perfect over broad...
Abstract Severe fever with thrombocytopenia syndrome virus was first discovered in 2009 as the causative agent of severe syndrome. Despite its potential threat to public health, no prophylactic vaccine is yet available. This study developed a heterologous prime-boost strategy comprising priming recombinant replication-deficient human adenovirus type 5 (rAd5) expressing surface glycoprotein, Gn, and boosting Gn protein. vaccination regimen induced balanced Th1/Th2 immune responses resulted...
X-ray free electron laser (XFEL) sources coupled to high-power systems offer an avenue study the structural dynamics of materials at extreme pressures and temperatures. The recent commissioning DiPOLE 100-X on high energy density (HED) instrument European XFEL represents state-of-the-art in combining x-ray diffraction with compression, allowing for compressed be probed unprecedented detail. Here, we report quantitative measurements molten Sn 85(5) GPa ∼3500 K. capabilities HED enable liquid...
This article presents high-efficiency ablation of aluminum using femtosecond laser processing with a pulse duration 300 fs and wavelength 1035 nm. A series stationary irradiation experiments were conducted at repetition rates frep = 50 kHz, 100 200 500 1 MHz. The comparison results indicated that as the rate increased above fluence F0 ≈ J/cm2, ΔL decreased. phenomenon could be attributed to particle shielding, which occurs density particles increases increasing volume ablated targets,...
We report enhanced superconductivity in the selenium on verge of β-Po-bcc phase transition, achieving up to 9.4 K at 140 GPa. The onset is confirmed by a direct zero-resistance drop R(T), and its nature was further validated suppression under an external magnetic field, [Formula: see text] An anomalously high R(T) peak preceding zero resistance state suggests granular superconductivity. Our studies indicate that does not react with hydrogen 182 GPa room temperature nor 102 laser heating 3000...
We present 50-fs, single-shot measurements of the x-ray thermal diffuse scattering (TDS) from copper foils that have been shocked via nanosecond laser ablation up to pressures above ∼135 GPa. hence deduce Debye–Waller factor, providing a temperature measurement. The targets were laser-shocked with DiPOLE 100-X at High Energy Density endstation European X-ray Free-Electron Laser. Single pulses, photon energy 18 keV, scattered samples and recorded on Varex detectors. Despite being highly...
Abstract Inverse photoconductivity (IPC) is a unique photoresponse behavior that exists in few photoconductors which electrical conductivity decreases with irradiation, and has great potential applications the development of photonic devices nonvolatile memories low power consumption. However, it still challenging to design achieve IPC most materials interest. In this study, pressure‐driven investigated n‐type WO 3 nanocuboids functionalized p‐type CuO nanoparticles under visible...
A clear experimental explanation of the contribution Mott and Peierls transitions to insulator–metal transition (IMT) characteristics in vanadium dioxide (VO2) is still lacking. Examining crystal electronic structures epitaxial VO2 films grown at various deposition temperatures, a or was observed. The film deposited 500 °C showed suppressed because large in-plane compressive strain insulating phase. 600 650 had higher IMT temperature relaxation both out-of-plane strain, there were abundant...