A5000349644- Graphene research and applications
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Supercapacitor Materials and Fabrication
- Carbon Nanotubes in Composites
- Ga2O3 and related materials
- ZnO doping and properties
- Graphene and Nanomaterials Applications
- Diamond and Carbon-based Materials Research
- GaN-based semiconductor devices and materials
- Force Microscopy Techniques and Applications
- Lipid Membrane Structure and Behavior
- Surface Modification and Superhydrophobicity
- Semiconductor materials and devices
- Electrocatalysts for Energy Conversion
- Fiber-reinforced polymer composites
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Advanced Sensor and Energy Harvesting Materials
- Gold and Silver Nanoparticles Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- Nanomaterials and Printing Technologies
- Thermal Radiation and Cooling Technologies
- Advanced Materials and Mechanics
- Advanced Thermoelectric Materials and Devices
Changwon National University
2020-2025
Ulsan National Institute of Science and Technology
2012-2023
Government of the Republic of Korea
2017-2018
Abstract High-performance p -type two-dimensional (2D) transistors are fundamental for 2D nanoelectronics. However, the lack of a reliable method creating high-quality, large-scale semiconductors and suitable metallization process represents important challenges that need to be addressed future developments field. Here, we report fabrication scalable single-crystalline 2H-MoTe 2 transistor arrays with Fermi-level-tuned 1T’-phase semimetal contact electrodes. By transforming polycrystalline...
The development of ultrathin barrier films is vital to the advanced semiconductor industry. Graphene appears hold promise as a protective coating; however, polycrystalline and defective nature engineered graphene hinders its practical applications. Here, we investigate oxidation behavior graphene-coated Cu foils at intrinsic defects different origins. Macro-scale information regarding spatial distribution resistance various readily obtained using optical electron microscopies after hot-plate...
A simple and robust strategy to form uniform 3D graphene on Ni foam is developed improve the performance durability of bipolar plates for polymer electrolyte membrane fuel cells.
Growth of large-scale patterned, wrinkle-free graphene and the gentle transfer technique without further damage are most important requirements for practical use graphene. Here we report growth wrinkle-free, strictly uniform monolayer films by chemical vapor deposition on a platinum (Pt) substrate with texture-controlled giant grains thermal-assisted patterned onto arbitrary substrates. The designed Pt surfaces limited numbers grain boundaries improved surface perfectness as well small...
Today, state-of-the-art III-Ns technology has been focused on the growth of c-plane nitrides by metal-organic chemical vapor deposition (MOCVD) using a conventional two-step process. Here we show that use graphene as coating layer allows one-step heteroepitaxial GaN films sapphire in MOCVD reactor, simplifying It is found improves wetting between and sapphire, and, with little ~0.6 nm coating, overgrown becomes continuous flat. With increasing thickness structural optical properties grown...
The practical application of 2D MXenes in electronic and energy fields has been hindered by the severe variation quality MXene products depending on parent MAX phases, manufacturing techniques, preparation parameters. In particular, their synthesis impeded lack studies reporting high-quality phases. addition, controllable uniform deposition various large-scale substrates is urgently required to use them practically. Herein, a method pelletizing raw materials could synthesize stoichiometric...
A mechanically robust flexible transparent conductor with high thermal and chemical stability was fabricated from welded silver nanowire networks (w-Ag-NWs) sandwiched between multilayer graphene (MLG) polyimide (PI) films. By modifying the gas flow dynamics surface chemistry of Cu during growth, a highly crystalline uniform MLG film obtained on foil, which then directly coated Ag-NW to serve as barrier material. It found that layers in compensate for structural defects, thus forming perfect...
Few-layer graphene films with a controllable thickness were grown on nickel surface by rapid thermal annealing (RTA) under vacuum. The instability of in air facilitates the spontaneous formation ultrathin (<2–3 nm) carbon- and oxygen-containing compounds surface; thus, high-temperature samples without introduction intentional carbon-containing precursors results films. From temperature ambient studies during RTA, it was found that evaporation oxygen atoms from is dominant factor affecting...
Abstract As the elements of integrated circuits are downsized to nanoscale, current Cu‐based interconnects facing limitations due increased resistivity and decreased current‐carrying capacity because scaling. Here, bottom‐up synthesis single‐crystalline WTe 2 nanobelts low‐ high‐field electrical characterization nanoscale interconnect test structures in various ambient conditions reported. Unlike exfoliated flakes obtained by top‐down approach, growth mode allows systemic properties single...
A single-layer graphene has been uniformly grown on a Cu surface at elevated temperatures by thermal processing of poly(methyl methacrylate) (PMMA) film in rapid annealing (RTA) system under vacuum. The detailed chemistry the transition from solid-state carbon to catalytic was investigated performing situ residual gas analysis while PMMA/Cu-foil samples were being heated, conjunction with interrupted growth studies reconstruct ex heating process. data clearly show that formation occurs...
We report the novel role of graphene substrates in obstructing aging propagation both basal planes and edges two-dimensitional sheets transition metal dichalcogenides (TMDs). Even after 300 d ambient air conditions, epitaxially grown WS2/graphene samples have a clean, uniform surface without any encapsulation. show that high crystallinity is an effective factor determines excellent stability WS2/graphene, we present impressive experimental evidence relation between defects phenomena....
Abstract Following the celebrated discovery of graphene, considerable attention has been directed toward rich spectrum properties offered by van der Waals crystals. However, studies have largely limited to their 2D due lack 1D structures. Here, growth high‐yield, single‐crystalline nanobelts composed transition metal ditellurides at low temperatures ( T ≤ 500 °C) and in short reaction times t 10 min) via use tellurium‐rich eutectic alloys is reported. The synthesized semimetallic products...
Graphene has recently attracted particular interest as a flexible barrier film preventing permeation of gases and moistures. However, it been proved to be exceptionally challenging develop large-scale graphene films with little oxygen moisture suitable for industrial uses, mainly due the presence nanometer-sized defects obscure origins. Here, origins water permeable routes on graphene-coated Cu foils are investigated by observing micrometer-sized rusts in underlying substrates,...
Abstract The structural engineering of 2D layered materials is emerging as a powerful strategy to design catalysts for high‐performance hydrogen evolution reaction (HER). However, the ultimate test this technology under typical operating settings lies in reduced performance and shortened lifespan these catalysts. Here, novel approach proposed efficient robust HER through out‐of‐plane deformation heterojunction using metal‐organic chemical vapor deposition. High‐yield, single‐crystalline WTe...
It is observed that epitaxial graphene forms on the surface of a 6H-SiC substrate by irradiating electron beam directly sample in high vacuum at relatively low temperature (∼670 °C). The symmetric shape and full width half maximum 2D peak Raman spectra indicate formed turbostratic. gradual change with irradiation time increasing suggests randomly distributed small grains form first grow laterally to cover entire irradiated area. sheet resistance film measured be ∼6.7 kΩ/sq.
The effects of atomic and structural defects on the interlayer properties or configuration in van der Waals heterostructures have been thoroughly investigated using WS<sub>2</sub> flakes directly grown graphene.
Graphene-encapsulated hybrid nanocomposites with low dimensionality are prepared via the solution-free, direct graphene growth approach at temperatures. The encapsulation strategy allows controlling thickness of nanoshells, and size density graphene-encapsulated different components morphologies can be easily controlled by varying experimental parameters. As a service to our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may...
We prepare giant Quantum dot-Liposome Complexes (QLCs). dots (QDs) incorporated inside liposome above 10 μ m. QLCs is made by using the electro-swelling method combined with spin coating techniques. Three types of PC lipids and asolectin lipid are used for HDA (hexadecylamine) coated QDs, which ranged from blue- (diameter ~2.1 nm) to red-emission ~5.0 nm). As expected, (blue- or) green-emission QDs (smaller than) comparable thickness bilayer (~4 successfully formed QLCs, but bigger than that...
Growth of cubic InN (c-InN) under N-rich condition was achieved by metalorganic chemical vapour deposition on GaP(1 0 0) substrates with a GaN (c-GaN) buffer layer. Insertion the c-GaN layer suppressed In droplet formation in c-InN. X-ray diffraction and transmission electron microscopy investigations showed that layers have zincblende structure only small fraction oxide phase inclusions no significant hexagonal is present. By systemically varying growth conditions, it found c-InN dominated...