A5090584934- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Electrocatalysts for Energy Conversion
- Crystallography and molecular interactions
- Advanced Sensor and Energy Harvesting Materials
- Cancer-related gene regulation
- Advanced battery technologies research
- Plasmonic and Surface Plasmon Research
- Electrodeposition and Electroless Coatings
- Advanced Photocatalysis Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Molecular Junctions and Nanostructures
- Advancements in Battery Materials
- Copper Interconnects and Reliability
- Conducting polymers and applications
- Electronic Packaging and Soldering Technologies
- Supercapacitor Materials and Fabrication
- High-Velocity Impact and Material Behavior
- Semiconductor materials and devices
- Epigenetics and DNA Methylation
- Fluid Dynamics Simulations and Interactions
- 3D IC and TSV technologies
- Nanowire Synthesis and Applications
- Fuel Cells and Related Materials
- Advanced Battery Materials and Technologies
Kyung Hee University
2015-2024
Korea Institute of Industrial Technology
2012-2023
Dankook University
2022
Seoul National University
2022
Yong In University
2016-2020
Hanyang University
2005-2020
Sungkyunkwan University
1998-2020
Korea University of Technology and Education
2020
Yonsei University
2019
Korea Advanced Institute of Science and Technology
2000-2018
A simple approach is described to fabricate reversible, thermally- and optically responsive actuators utilizing composites of poly(N-isopropylacrylamide) (pNIPAM) loaded with single-walled carbon nanotubes. With nanotube loading at concentrations 0.75 mg/mL, we demonstrate up 5 times enhancement the thermal response time nanotube-pNIPAM hydrogel caused by enhanced mass transport water molecules. Additionally, ability obtain ultrafast near-infrared optical in hydrogels under laser excitation...
Abstract The electrocatalytic conversion of CO 2 to value‐added hydrocarbons is receiving significant attention as a promising way close the broken carbon‐cycle. While most metal catalysts produce C 1 species, such carbon monoxide and formate, production various alcohols comprising more than two carbons has been achieved using copper (Cu)‐based only. Methods for producing specific reduction outcomes with high selectivity, however, are not available thus far. Herein, morphological effect Cu...
We report high-performance flexible nanogenerators (NGs) based on a composite thin film, composed of hemispherically aggregated BaTiO3 nanoparticles (NPs) and poly(vinylidene fluoride-co-hexafluoropropene) P(VDF-HFP). The hemispherical BTO–P(VDF-HFP) clusters were realized by solvent evaporation method, which greatly enhanced piezoelectric power generation. NGs exhibit high electrical output up to ∼75 V ∼15 μA at the applied force normal surface, indicating important role BTO clusters....
Perfect texture: The roles of surface nanotexturing, TiO2 passivation, and a ruthenium cocatalyst on the photoelectrochemical evolution hydrogen by using p-InP photocathodes are investigated. Higher current densities more favorable onset potentials observed after nanotexturing. NHE=normal electrode. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please...
Two different materials, apart from each other in a triboelectric series, are required to fabricate high performance generators (TEGs). Thus, it often limits the choices of materials and causes related processing issues for TEGs. To address this issue, we report simple surface functionalization method that can effectively change charging sequence broadening material enhancing Specifically, functionalized surfaces polyethylene terephthalate (PET) films either with poly-l-lysine solution or...
Triboelectric charging involves frictional contact of two different materials, and their electrification usually relies on polarity difference in the triboelectric series. This limits choices materials for pairs, hindering research development energy harvest devices utilizing effect. A progressive approach to resolve this issue modification chemical structures effectively engineering properties. Here, we describe a facile method change property polymeric surface via atomic-level...
Surface plasmon polaritons (SPPs) and Rayleigh anomalies (RAs) are two characteristic phenomena exhibited by periodic grating structures made of plasmonic materials. For Au subwavelength hole arrays, SPPs RAs from opposite sides the film can interact under certain conditions to produce highly intense, narrow spectral features called RA-SPP resonances. This paper reports how effects be achieved in arrays Pd, a weak material. Well-defined resonances observed measured simulated optical...
Sensors based on 2D rGO/2D MoS<sub>2</sub> van der Waals hybrid composites exhibited high sensitivity, extreme selectivity, fast response/recovery, and good reliability to humidity detection.
This paper reports an all-moldable nanofabrication platform that can generate, from a single master, large-area nanoscale patterns with programmable densities, fill factors, and lattice symmetries. Solvent-assisted embossing (SANE) could increase the spacing of up to 100% as well decrease them down 50% in step by stretching or heating polymer substrate. Also, SANE reduce critical feature sizes small 45% compared master controlled swelling patterned molds different solvents. These...
We present a method to develop high performance flexible piezoelectric nanogenerators (NGs) by employing Li-doped ZnO nanowires (NWs). synthesized NWs and adopted them replace intrinsic with relatively low coefficient. When we exploited the ferroelectric phase transition induced in NWs, of NGs was significantly improved NG fabrication process greatly simplified. In addition, our approach can be easily expanded for large-scale fabrication. Consequently, fabricated simple exhibit excelling...
Abstract Ultrafine particulate matter (PM) in indoor air has become a serious concern for public health. Therefore, there is growing interest filters that can be installed on the window frames of ordinary homes to improve quality by natural passive ventilation without using expensive forced circulation systems. Thus, these require high filtering efficiency and permeability visibility, which do not compromise original functionality windows. The developed this purpose date have demonstrated PM...
Ultrafine particulate matters (PMs) are an imminent threat to the human respiratory system, as their sizes comparable and even smaller than tissues. To cope with this situation, researchers have developed commercialized various personal dust proof masks. However, because of relatively thick filter membrane guarantee filtering efficiency, a huge pressure drop across active layer is inevitable breathing through it becomes uncomfortable. In work, we investigated performance electrospun...
Electrochemical energy conversion processes such as water reduction to produce hydrogen and carbon dioxide into valuable products have attracted great attention alternative green technologies fossil fuels. Nevertheless, the efficiency long-term stability of these remain very far from requirements for industrial applications because sluggish kinetics oxygen evolution reaction (OER). In this study, La-doped NiFe-layered double hydroxides (LDHs) were synthesized on Ni foam via a facile...
Glycerol, a byproduct of biodiesel production, is promising feedstock for conversion into high-value products through the glycerol electrochemical oxidation reaction (GEOR). Herein, Ni-based layered double hydroxide (Ni LDH) catalyst synthesized via hydrothermal synthesis to investigate mechanism selective formic acid (FA). The Ni LDH exhibits not only high rate but also higher selectivity and Faradaic efficiency FA at low potentials compared NiFe LDHs. Through density functional theory...
This paper reports a new type of diffractive microlens based on finite-areas two-dimensional arrays circular nanoholes (patches). The plasmonic microlenses can focus single wavelengths light across the entire visible spectrum as well broadband white with little divergence. focal length is determined primarily by overall size patch and tolerant to significant changes in substructure, including lattice geometry local order nanoholes. optical throughput, however, depends sensitively...
One of the major challenges in further advancement III-V electronics is to integrate high mobility complementary transistors on same substrate. The difficulty due large lattice mismatch optimal p- and n-type semiconductors. In this work, we employ a two-step epitaxial layer transfer process for heterogeneous assembly ultrathin membranes compound semiconductors Si/SiO(2) substrates. III-V-on-insulator (XOI) concept, ultrathin-body InAs (thickness, 13 nm) InGaSb 7 layers are used...
We report a simple method to realize multifunctional flexible motion sensor using ferroelectric lithium-doped ZnO-PDMS. The layer enables piezoelectric dynamic sensing and provides additional information more precisely discriminate different motions. PEDOT:PSS-functionalized AgNWs, working as electrode layers for the layer, resistively detect change of both movement or temperature. Thus, through optimal integration elements, limit, accuracy, functionality can be further expanded. introduced...
The piezoelectric potential screening by large excess electrons in nominally undoped ZnO has limited the energy conversion efficiency of nanogenerators (NGs). In this study, we report a simple and effective approach to enhance output performance NGs forming CuO–ZnO heterostructure. By depositing thin film on pre-deposited CuO film, which forms p–n junction, can be effectively reduced. Thus, generated an applied force less affected. Using approach, obtained voltage up ∼7.5 V maximum current...
Chemical transformation of existing two-dimensional (2D) materials can be crucial in further expanding the 2D crystal palette required to realize various functional heterostructures. In this work, we demonstrate a 'on-stack' chemical conversion single-layer crystalline MoS2 into MoO3 with precise layer control that enables truly and MoO3/MoS2 To minimize perturbation morphology, nonthermal oxidation using O2 plasma was employed. The early stage reaction characterized by defect-induced Raman...