A5100759185- Advanced ceramic materials synthesis
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced materials and composites
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Advanced Battery Technologies Research
- ZnO doping and properties
- Thin-Film Transistor Technologies
- MXene and MAX Phase Materials
- Ferroelectric and Piezoelectric Materials
- Supercapacitor Materials and Fabrication
- Microwave Dielectric Ceramics Synthesis
- Photonic and Optical Devices
- Transition Metal Oxide Nanomaterials
- Advancements in Solid Oxide Fuel Cells
- Semiconductor materials and devices
- Advanced Fiber Optic Sensors
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Gas Sensing Nanomaterials and Sensors
- Intermetallics and Advanced Alloy Properties
- Electronic and Structural Properties of Oxides
- Extraction and Separation Processes
- Catalytic Processes in Materials Science
Korea Advanced Institute of Science and Technology
2016-2025
Bio-Medical Science (South Korea)
2025
Kyungpook National University
2015-2024
Korea Basic Science Institute
2023
Institute for Basic Science
2023
Seoul National University of Science and Technology
2023
Korea University
2006-2023
Chonnam National University Hospital
2023
Kootenay Association for Science & Technology
2010-2022
Samsung Medical Center
2009-2022
A nanocomposite generator (NCG) is fabricated using piezoelectric BaTiO3 nanoparticles and universal graphitic carbons (carbon nanotubes reduced graphene oxide). produced by the simple process of dispersing carbon-based nanomaterials in a polydimethylsiloxane matrix subsequent spin-casting onto metal-coated plastic substrate. The NCG device generates an output voltage ∼3.2 V current ∼350 nA under periodic mechanical deformation to strain 0.33%. generated electric energy stored capacitors...
Spinel LiMn2O4 is a low-cost, environmentally friendly, and highly abundant material for Li-ion battery cathodes. Here, we report the hydrothermal synthesis of single-crystalline β-MnO2 nanorods their chemical conversion into free-standing using simple solid-state reaction. The have an average diameter 130 nm length 1.2 μm. Galvanostatic testing showed that high charge storage capacity at power rates compared with commercially available powders. More than 85% initial was maintained over 100...
Superparamagnetic iron oxide nanoparticles (SPION) with an average particle diameter of 6 nm are prepared by controlled chemical coprecipitations. Colloidal suspensions noninteracting SPION, where the surface has been modified three different types biocompatible substances, namely, starch, gold (Au), and methoxypoly(ethylene glycol) (MPEG) have fabricated via techniques. Starch-coated SPION coprecipitation in a polymeric matrix, Au-coated microemulsion method, MPEG-coated using self-assembly...
Ultrathin LiMn2O4 nanowires with cubic spinel structure were synthesized by using a solvothermal reaction to produce α-MnO2 nanowire followed solid-state lithiation. have diameters less than 10 nm and lengths of several micrometers. Galvanostatic battery testing showed that deliver 100 78 mAh/g at very high rate (60C 150C, respectively) in larger potential window good capacity retention outstanding structural stability. Such performances are due both the favorable morphology crystallinity nanowires.
This article provides an up-to-date review on nanocomposites composed of inorganic nanoparticles and the polymer matrix for optical magnetic applications. Optical or characteristics can change upon decrease particle sizes to very small dimensions, which are, in general, major interest area nanocomposite materials. The use into provide high-performance novel materials that find applications many industrial fields. With this respect, frequently considered features are properties such as light...
Monoclinic S8, an uncommon allotrope of sulfur at room temperature, can be formed when common orthorhombic S8 is heat-treated under enclosed environments in nanometer dimensions. prevents the formation soluble polysulfides during battery operation, resulting unprecedented cycling performance over 1000 cycles highest content to date. As a service our authors and readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may re-organized for...
Substantial interest in sodium resources that are inexpensive and abundant the earth has guided intense research on Na-based electrode materials. We report a facile synthetic strategy to improve rate performance of materials sodium-ion batteries. Na3V2(PO4)3 (NVP) is one most promising cathode with NASICON structure, it been synthesized graphene sheet surface using simple method combines sol–gel solid-state reaction. The NVP/graphene composite displays an excellent high-rate performance;...
The Na0.44MnO2 structure is a promising cathode material for sodium ion batteries due to high capacity (∼130 mAh/g) and good cycle performance. In this work, we present the results of density functional theory (DFT) calculations on structural electrochemical properties Na0.44MnO2, combined with experiments. Seven intermediate phases two-phase reactions among them were found, where calculated voltage profile agreed well We found that S-shaped tunnel not empty in deintercalated Na0.22MnO2 but...
A flexible piezoelectric energy harvester was demonstrated by an aerosol-deposited PZT film to realize a self-powered wireless sensor node system. The harvesting device can generate voltage of 200 V and current 35 μA. constructed integrating the harvester, rectifying/storage circuit, temperature-sensor measure ambient temperature wirelessly transmit data monitor. As service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed...
Superparamagnetic iron oxide nanoparticles (SPION) with suitable bio-compatible coatings have been used in biomedicine, particularly magnetic resonance imaging (MRI), tissue engineering, and drug delivery applications. In this study, we describe the synthesis of SPION its use for experimental in-vivo applications MRI. a mean size 6 nm prepared under inert atmosphere, polymeric starch matrix, by controlled chemical coprecipitation magnetite phase from aqueous solutions containing salts Fe2+...
A simple process enables to synthesize tungsten oxide with various nanomorphologies, i.e. nanorods, nanowires, and nanosheets. The hexachloride (WCl 6 ) was used as a raw material the nanoparticles were obtained by solvothermal treatment solvents, i.e., ethanol, mixed solvent (ethanol+water), water, at 200°C for 10 h. crystalline phases of oxide, such monoclinic W 18 O 49 hexagonal WO 3 platelets, nanosheets, synthesized simply changing composition solvent. oxygen, which contained in played...
Nanostructural design renders several breakthroughs for the construction of high-performance materials and devices including energy-storage systems. Although attempts made toward electrode engineering have improved existing drawbacks, nanoengineering is still hindered by some issues. To achieve practical applications lithium-sulfur (Li-S) batteries, it difficult to attain a high areal capacity with stable cycling. Physical encapsulation via nanostructural not only can resolve issue lithium...
We report the scalable growth of aligned graphene and hexagonal boron nitride on commercial copper foils, where each film originates from multiple nucleations yet exhibits a single orientation. Thorough characterization our reveals uniform crystallographic electronic structures length scales ranging nanometers to tens centimeters. As we demonstrate with artificial twisted bilayers, these inexpensive versatile films are ideal building blocks for large-scale layered heterostructures...
A facile synthetic strategy was implemented to obtain nanosized barium titanate ( BaTiO 3 ) powders with tetragonal structure. The nanoparticles were synthesized using solvothermal process employing diethanolamine and triethanolamine suppress the particle growth as‐prepared nanopowders characterized X‐ray diffraction, scanning electron microscopy, high‐resolution dispersive R aman spectroscopy. It found that size can be easily tuned by adjusting experimental parameters while retaining...
Sodium layered oxides with mixed transition metals have received significant attention as positive electrode candidates for sodium‐ion batteries because of their high reversible capacity. The phase transformations compounds during electrochemical reactions are a pivotal feature understanding the relationship between structures and properties. A combination in situ diffraction ex X‐ray absorption spectroscopy reveals mechanism ternary metal system (Fe–Mn–Co) P2 stacking. In synchrotron using...
Lead-free piezoelectric 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O3 (BCTZ) nanoparticles (NPs) composed of earth-abundant elements were adopted for use in a flexible composite-based energy harvester (PEH) that can convert mechanical deformation into electrical energy. The solid-state synthesized BCTZ NPs and silver nanowires (Ag NWs) chosen to reduce the toxicity filler materials blended with polydimethylsiloxane (PDMS) matrix produce nanocomposite (p-NC). naturally polymer-based p-NC layers...