A5035020599- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- ZnO doping and properties
- Advanced ceramic materials synthesis
- Aluminum Alloys Composites Properties
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Nanowire Synthesis and Applications
- Diamond and Carbon-based Materials Research
- Advanced Battery Technologies Research
- Semiconductor materials and devices
- 2D Materials and Applications
- Advanced materials and composites
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Catalytic Processes in Materials Science
- Graphene research and applications
- Hydrogen Storage and Materials
- Advanced Materials Characterization Techniques
- Chalcogenide Semiconductor Thin Films
- Metal and Thin Film Mechanics
- Ga2O3 and related materials
- nanoparticles nucleation surface interactions
- Aluminum Alloy Microstructure Properties
- Advanced Memory and Neural Computing
Korea Institute of Science and Technology
2016-2025
Korea Advanced Institute of Science and Technology
2015-2025
Korea University of Science and Technology
2023-2024
Korean Association Of Science and Technology Studies
2001-2022
Government of the Republic of Korea
2018-2020
Korea Institute of Science & Technology Information
2020
Korea Basic Science Institute
2020
Daejeon University
2020
Seoul Institute
2019
Korea University
2005-2016
Easy preparation of iron oxide nanoparticles [5- and 11-nm maghemite (γ-Fe2O3) 19-nm magnetite (Fe3O4)] by thermal decomposition Fe(CO)5 in the presence residual oxygen system consecutive aeration were investigated TEM/HRTEM, XRD, Mössbauer spectroscopy. Also, magnetic properties studied SQUID magnetometer optical microscopy. It was suggested that intermediate (before aeration) formed competing processes oxidation crystal growth after Fe(CO)5. At room temperature, aerated 5-nm particles...
Fe 2 O 3 nanorods with controlled phase depending on the conditions have been synthesized via a sol–gel‐mediated route. The synthesis was performed using an easy and cheap method whereby, starting 3+ salt, sol–gel reaction in reverse micelles is followed by crystallization reflux (see Figure for schematic of synthesis). A mechanism proposed nanorod growth.
Significance In the past decade, countless studies have been performed to control mechanical and corrosion property of magnesium-based alloy, which degrades in physiological environment, overcome flaws inert implant materials shift paradigm conventional bone fixation devices. Controlled degradation Mg-5wt%Ca-1wt%Zn alloy results formation biomimicking calcification matrix at degrading interface initiate process. This process facilitates early healing allows complete replacement biodegradable...
Two-dimensional MoSe2 has emerged as a promising electrocatalyst for the hydrogen evolution reaction (HER), although its catalytic activity needs to be further improved. Herein, we report Se-rich nanosheets synthesized using hydrothermal reaction, displaying much enhanced HER performance at Se/Mo ratio of 2.3. The transition from 2H 1T′ phase occurred exceeded 2. Structural analysis revealed presence Se adatoms well formation Se–Se bonding. Based on first-principles calculations, propose two...
Stacked AA graphite has been synthesized using a high-density dc plasma in hydrogen-methane mixtures. Graphene layers have grown epitaxially with 2-1 registration between the graphitic edges and (111) surface of diamond. In addition, new crystal structure containing AA′ graphene layers, where alternate planes are translated by half hexagon width, is formed 1-1 registry. The resulting interplanar distances at interface range from 2.20Å for to 4.40Å measured directly high-resolution...
The charge-discharge process of the room-temperature Na/S battery is studied using cell with tetraethylene glycol dimethyl ether (TEGDME) and solid electrolyte. electrolyte a barrier for chemical mass transport between anode cathode. sodium polysulfides as reaction products in TEGDME could therefore be investigated without interference from side. During discharge, color changes transparent to brown, yellowish-green, then back transparent, reverse order during charge. first three colors are...
Two-dimensional ReSe2 has emerged as a promising electrocatalyst for the hydrogen evolution reaction (HER), but its catalytic activity needs to be further improved. Herein, we synthesized Re1–xMoxSe2 alloy nanosheets with whole range of x (0–100%) using hydrothermal reaction. The phase evolved in order 1T″ (triclinic) → 1T′ (monoclinic) 2H (hexagonal) upon increasing x. In = 10%, substitutional Mo atoms tended aggregate Se vacancies. incorporation makes more metallic than end compositions....
Abstract Extracellular matrix (ECM) proteins containing cell‐attachable Arg‐Gly‐Asp (RGD) sequences exhibit variable bridging and non‐bridging in fibronectin‐collagen laminin‐collagen complexes that can regulate inflammation, tissue repair, wound healing. In this study, linking molecule‐mediated conjugation of 1D magnetic nanocylinders (MNCs) to material surfaces pre‐decorated with gold nanospheres (GNSs) is performed, thereby yielding RGD‐coated MNCs (RGD‐MNCs) over GNSs (RGD‐GNSs) a state....
Ti O 2 single-crystalline nanorods are prepared from electrospun fibers which composed of nanofibrils with an islands-in-a-sea morphology. The mechanical pressure produces each fibril into converted to anatase single crystals after calcination. High-resolution transmission electron microscopy shows that the (001) plane is growing along longitudinal direction rod. In this work, nanorod electrode provides efficient photocurrent generation in a quasi-solid-state dye-sensitized solar cell using...
Self-healing of a well-designed Sn anode with ultra-long cycle life and stable high capacity.
Understanding the interfacial phenomena in composite cathodes is essential for achieving excellent cycle performance all-solid-state batteries (ASSBs), which exhibit high safety and energy densities. Herein, we report on spontaneous crack-healing mechanism a cathode consisting of LiNi0.7Co0.15Mn0.15O2 (NCM) Li6PS5Cl0.5Br0.5. This exhibited during cell tests owing to stack pressure, enhanced ionic electrical transfers at material interfaces by remarkably reducing macrocracks between materials...
Abstract In natural microenvironment, various proteins containing adhesive ligands in fibrous and non‐fibrous structures dynamically couple decouple to regulate stem cell fate. Herein, materials presenting movably couplable are developed by grafting liganded gold nanoparticles (AuNPs) a substrate followed flexibly movable linear nanomaterials (MLNs) the via long bendable linker, thereby creating space between MLNs AuNPs decoupled state. Magnetic control of decreases this bending linker...
Two-dimensional (2D) van der Waals (vdW) materials have recently attracted considerable attention due to their excellent electrical and mechanical properties. TmPSx (where Tm = a transition metal), which is new class of 2D vdW materials, expected show various physical phenomena depending on the used. In this paper, unprecedented synaptic behavior vertical Ag/CrPS4/Au capacitor structure, where CrPS4 single-crystalline layer, reported. Multi-stable resistive states were obtained using an...
Abstract Lead sulfide colloidal quantum dot photodiodes (PbS QDPDs) exhibit a high energy conversion efficiency for infrared detection. Despite the photoinduced current, performance of PbS QDPDs is limited by dark current which rarely investigated. Understanding in critical to improving detectivity QDPDs. Herein, it demonstrated that minority carriers I‐passivated films and trap sites EDT‐passivated are related QDPD. Utilizing annealing low‐temperature ligand exchange processes, density can...
BH 4 -substituted argyrodite solid electrolytes are mechanically softer and achieve near-theoretical density at lower pressures room temperature compared to Cl- or Br-substituted counterparts, which is consistent with nanoindentation test results.
Abstract Native tissues exhibit hierarchical structures of anisotropically arranged extracellular matrix that dynamically regulate stem cells and tissue function. However, neither multiscale nano‐anisotropy nor dynamic anisotropy control have been reported. In this study, spherical or rod‐shaped gold small‐nanomaterials (at integrin receptor‐scale; tens nanometers) are coupled to the surface magnetic large‐nanomaterials focal adhesion complex‐scale; hundreds nanometers), with both showing...