A5031757407- ZnO doping and properties
- Electronic and Structural Properties of Oxides
- Copper-based nanomaterials and applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Topological Materials and Phenomena
- Ga2O3 and related materials
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Electrocatalysts for Energy Conversion
- Physics of Superconductivity and Magnetism
- Graphene research and applications
- Quantum Dots Synthesis And Properties
- Advanced Battery Technologies Research
- Iron oxide chemistry and applications
- Advanced Photocatalysis Techniques
- Advancements in Battery Materials
- Catalytic Processes in Materials Science
- Superconductivity in MgB2 and Alloys
- Chalcogenide Semiconductor Thin Films
- Magnetic properties of thin films
- Electrochemical Analysis and Applications
- Extraction and Separation Processes
- Semiconductor materials and devices
- Perovskite Materials and Applications
Seoul National University
2014-2025
Gachon University
2022-2024
Oak Ridge National Laboratory
2020-2023
Saint Joseph's University
2022
Pusan National University
2022
Kyung Hee University
2018-2021
Seoul Institute
2020-2021
Government of the Republic of Korea
2020-2021
Institute for Basic Science
2018-2020
Sungkyunkwan University
2020
Mesoporous carbon materials are desirable electrode and also useful for the separation of bulky organics. In this article, templated synthesis a new high surface area mesoporous using hexagonal silica (HMS) aluminosilicate is reported. Preliminary results on electrochemical double-layer capacitance performance material presented that indicate it superior to commercially available MSC-25. addition, pore structure HMS indirectly elucidated.
Electroplastic phenomenon has been demonstrated by that the elongation increases remarkably during deformation under electric current without a significant elevation of temperature due to Joule heating. Since 1960s, electroplasticity actively investigated; however, an exact explanation mechanism lacking. In this study, origin in metallic materials is elucidated based on first principle calculation, finite element simulation and experimental approaches. First calculations system includes...
Abstract The electronic instabilities in CsV 3 Sb 5 are believed to originate from the V d -electrons on kagome plane, however role of p for 3-dimensional orders is largely unexplored. Here, using resonant tender X-ray scattering and high-pressure scattering, we report a rare realization conjoined charge density waves (CDWs) , where 2 × 1 CDW sublattice -electron assisted coexist. At ambient pressure, discover enhancement L -edge (2 s →5 ) at wavevectors. resonance, however, absent Applying...
Ni-rich layered LiNi1-x-y Cox Mny O2 systems are the most promising cathode materials for high energy density Li-ion batteries (LIBs). However, inevitably suffer from rapid capacity fading and poor rate capability owing to structural instability unstable surface side reactions. Zr doping has proven be an effective method enhance cycle performances by stabilizing structure increasing Li+ diffusion rate. Herein, effects of Zr-doping on stability kinetics thoroughly investigated in LiNi0.6...
Chiral interactions in magnetic systems can give rise to rich physics manifested, for example, as nontrivial spin textures. The foremost interaction responsible chiral magnetism is the Dzyaloshinskii-Moriya (DMI), resulting from inversion symmetry breaking presence of strong spin-orbit coupling. However, atomistic origin DMIs and their relationship emergent electrodynamic phenomena, such topological Hall effect (THE), remain unclear. Here, we investigate role interfacial 3d-5d transition...
Topological insulators (TIs) are exotic materials which have topologically protected states on the surface due to strong spin-orbit coupling. However, a lack of ordered growth TI thin films amorphous dielectrics and/or presents challenge for applications TI-junctions. We report topological insulator Bi2Se3 SiO2 by molecular beam epitaxy (MBE). To achieve surface, formation other phases at interface is suppressed Se passivation. Structural characterizations reveal that grown along [001]...
Quantum materials (QMs) with strong correlation and nontrivial topology are indispensable to next-generation information computing technologies. Exploitation of topological band structure is an ideal starting point realize correlated QMs. Here, we report that strain-induced symmetry modification in oxide SrNbO3 thin films creates emerging structure. Dirac electrons strained reveal ultrahigh mobility (μmax ≈ 100,000 cm2/Vs), exceptionally small effective mass (m* ~ 0.04me), nonzero Berry...
Heteroepitaxy of semiconductors on two-dimensional (2-d) atomic layered materials enables the use flexible and transferable inorganic electronic optoelectronic devices in various applications. Herein, we report shape- morphology-controlled van der Waals (vdW) epitaxy ZnO nanostructures hexagonal boron nitride (hBN) insulating layers for an architectured semiconductor integration 2-d materials. The vdW surface feature nanomaterials, because free dangling bonds, typically results low-density...
Abstract High-valent metal-oxo moieties have been implicated as key intermediates preceding various oxidation processes. The critical O–O bond formation step in the Kok cycle that is presumed to generate molecular oxygen occurs through high-valent Mn-oxo species of water complex, i.e., Mn 4 Ca cluster photosystem II. Here, we report spectroscopic characterization new during reaction manganese-based heterogeneous catalysts and assign them low-spin Mn(IV)-oxo species. Recently, effects spin...
Abstract Bioplastics offer a solution to the problem of increasing atmospheric CO 2 levels contributed by linear production and consumption pattern fossil‐derived plastics closing carbon loop with material sourcing from biomass bioplastic's biodegradability. Spirulina, genus cyanobacteria that is capable rapid uptake, can be key realizing circular plastic economy converting value‐added high protein content biomass, which extracted processed produce protein‐based bioplastics captured...
Alternate stacking of a highly conducting metallic layer with magnetic triangular found in delafossite PdCrO2 provides an excellent platform for discovering intriguing correlated quantum phenomena. Thin film growth delafossites may enable not only the tuning basic physical properties beyond what bulk materials can exhibit, but also development novel hybrid by interfacing dissimilar materials, yet this has proven to be extremely challenging. Here, we report epitaxial films pulsed laser...
The origin of strain-induced ferromagnetism, which is robust regardless the type and degree strain in LaCoO3 (LCO) thin films, enigmatic despite intensive research efforts over past decade. Here, by combining scanning transmission electron microscopy with ab initio density functional theory plus U calculations, we report that ferromagnetism does not emerge directly from itself but rather creation compressed structural units within ferroelastically formed twin-wall domains. are magnetically...
By using graphene as an electron beam-transparent substrate for both nanomaterial growth and transmission microscopy (TEM) measurements, we investigate initial behavior of nanomaterials. The direct imaging method facilitate atomic-resolution nanomaterials at the very early stage growth. This enables observation transition in crystal structure ZnO nuclei formation various defects during
Abstract Manipulation of the heterointerfacial structure and/or chemistry transition metal oxides is great interest for development novel properties. However, few studies have focused on effects growth characteristics oxide thin films, although such interfacial engineering crucial to determine dynamics and physical properties heterostructures. Herein, we show that play key roles in determining process films by overcoming simple epitaxial strain energy. Brownmillerite (SrFeO 2.5 ; BM-SFO) are...
Understanding the chemical states of individual surface atoms and their arrangements is essential for addressing several current issues such as catalysis, energy stroage/conversion, environmental protection. Here, we exploit a profile imaging technique to understand correlation between atomic structures oxygen evolution reaction (OER) in Mn3O4 nanoparticles. We image nanoparticles observe reconstructions (110) (101) planes. Mn3+ ions at surface, which are commonly considered active sites...
ABO2 delafossites are fascinating materials that exhibit a wide range of physical properties, including giant Rashba spin splitting and anomalous Hall effects, because their characteristic layered structures composed noble metal A strongly correlated BO2 sublayers. However, thin film synthesis is known to be extremely challenging owing low symmetry rhombohedral structures, which limit the selection substrates for epitaxy. Hexagonal lattices, such as those provided by Al2O3(0001) (111)...
An extremely large linear magnetoresistance (LMR) is a ubiquitous phenomenon emerging from topological Dirac and Weyl semimetals. However, the connection between an LMR nontrivial topology under extensive debate. In this paper, by precisely controlling thickness of ${\mathrm{SrNbO}}_{3}$ thin films grown on ${\mathrm{SrTiO}}_{3}$ substrates, we observe over carrier density range with as high $150\phantom{\rule{0.16em}{0ex}}000%$ at...
Abstract Ferromagnetic insulators play a crucial role in the development of low‐dissipation quantum magnetic devices for spintronics. Epitaxial LaCoO 3 thin film is prominent ferromagnetic insulator, which robust ordering emerges owing to epitaxial strain. Whereas it evident that strong spin‐lattice coupling induces ferromagnetism, reported properties epitaxially strained films are highly consistent. For example, even under largely modulated degree strain, Curie temperatures lie narrow range...