A5101524554- 2D Materials and Applications
- Perovskite Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Quantum and electron transport phenomena
- Molecular Junctions and Nanostructures
- Chalcogenide Semiconductor Thin Films
- Advanced Memory and Neural Computing
- Surfactants and Colloidal Systems
- Nanocluster Synthesis and Applications
- Nanowire Synthesis and Applications
- Acoustic Wave Resonator Technologies
- Photonic Crystals and Applications
- Thin-Film Transistor Technologies
- Advanced Polymer Synthesis and Characterization
- Photopolymerization techniques and applications
- Nanoplatforms for cancer theranostics
- Layered Double Hydroxides Synthesis and Applications
- Luminescence Properties of Advanced Materials
- Magnesium Oxide Properties and Applications
- Adsorption and Cooling Systems
- ZnO doping and properties
- Plasmonic and Surface Plasmon Research
Korea Advanced Institute of Science and Technology
2020-2024
Pohang University of Science and Technology
2023
Institute for Basic Science
2016-2023
Ajou University
2017-2019
Suwon Research Institute
2017
Sungkyunkwan University
2008-2016
Chungnam National University
2010-2012
Korea Institute of Oriental Medicine
2012
Samsung (South Korea)
2006
Atomically smooth van der Waals materials are structurally stable in a monolayer and few layers but susceptible to oxygen-rich environments. In particular, recently emerging such as black phosphorus perovskite have revealed stronger environmental sensitivity than other two-dimensional layered materials, often obscuring the interesting intrinsic electronic optical properties. Unleashing true potential of these requires oxidation-free sample preparation that protects thin flakes from air...
The extreme elastic strain of monolayer transition metal dichalcogenides provides an ideal platform to achieve efficient exciton funneling via local modulation; however, studies conducted thus far have focused on the use substrates with fixed profiles. We prepared 1L-WS2 a flexible substrate such that formation topographic wrinkles could be switched or off, and depth direction wrinkle modified by external strain, thereby providing full control periodic undulation band gap profile in range...
In general, the quantum yields (QYs) of monolayer transition metal dichalcogenides (1L-TMDs) are low, typically less than 1% in their pristine state, significantly limiting photonic applications. Many methods have been reported to increase QYs 1L-TMDs; however, technical difficulties involved reliable estimation these prevented general assessment methods. Herein, we demonstrate 1L-TMDs using a poly methyl methacrylate (PMMA) thin film embedded with rhodamine 6G (R6G) as reference specimen...
Van der Waals (vdW) heterostructures have drawn much interest over the last decade owing to their absence of dangling bonds and intriguing low-dimensional properties. The emergence 2D materials has enabled achievement significant progress in both discovery physical phenomena realization superior devices. In this work, group IV metal chalcogenide 2D-layered Ge4 Se9 is introduced as a new selection insulating vdW material. synthesized with rectangular shape using metalcorganic chemical vapor...
Abstract In this work, the potential of 2D semi‐metallic PtSe 2 as source/drain (S/D) contacts for material field‐effect‐transistors (FETs) through theoretical and experimental investigations, is explored. From density functional theory (DFT) calculations, can inject electrons holes into MoS WSe , respectively, indicating feasibility both n‐ p‐metal‐oxide‐semiconductor FETs (n‐/p‐MOSFETs). Indeed, experimentally fabricated flake‐level n‐MOSFETs p‐MOSFETs exhibit a significant reduction in...
Abstract Upconversion nanoparticles (UCNPs), as near‐infrared (NIR) absorbers, are promising materials for use in flexible NIR photodetectors, which can be applied wearable healthcare applications due to their advantages a broad spectral range, high photostability, and biocompatibility. However, apply UCNPs large‐area integrated devices, water stability micro‐patterning methods required. In this work, the encapsulated with siloxane polymer (UCNP@SiOx) via sol–gel process enable...
The capability to finely tailor material thickness with simultaneous atomic precision and non-invasivity would be useful for constructing quantum platforms post-Moore microelectronics. However, it remains challenging attain synchronized controls over tailoring selectivity precision. Here we report a protocol that allows non-invasive atomically digital etching of van der Waals transition-metal dichalcogenides through selective alloying via low-temperature thermal diffusion subsequent wet...
Abstract Advanced patterning techniques are essential to pursue applications of 2D van der Waals (vdW) materials in electrical and optical devices. Here, the direct lithography (DOL) vdW by single‐pulse irradiation high‐power light through a photomask is reported. The DOL exhibits large‐scale with sub‐micrometer resolution clean surface, which can be applied various combinations substrates. In addition, thermal profile during investigated using finite element method, ideal conditions...
We studied both cw and time-resolved photoluminescence of colloidal CdSe/ZnS core-shell quantum dots capped with chemical ligands. For the trioctylphosphine oxide QDs, luminescence intensity lifetime were found to be increased increasing temperatures, which can explained by thermal activation carriers trapped at shallow trapping centers. After ligand exchange into 3-mercaptopropionic acid, non-radiative recombination rate was efficiency decreased room temperature. When QDs employed in...
Abstract Novel Sulfonium salts with non‐nucleophilic anions were synthesized and applicability of these as initiators was demonstrated by carried out polymerization (photo thermal) epoxides well vinyl ether monomers. Newly showed good activity for the photo thermal polymerization. Synthesis, characterization, have been described. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008.
Graphene, with its unique band structure, mechanical stability, and high charge mobility, holds great promise for next-generation electronics. Nevertheless, zero gap challenges the control of current flow through electrical gating, consequently limiting practical applications. Recent research indicates that atomic oxygen can oxidize epitaxial graphene in a vacuum without causing unwanted damage. In this study, we have investigated effects chemisorbed on electronic properties graphene, using...
We have developed fast bend transition method of pi-cell in low temperature. This cell requires a the liquid crystals (LC) from an initial splay state to before normal driving operation. study analyzed conditions under which this is generated Consequently, by applying waveform that make most LC's dynamic response, using structure top-gate electrode and surface alignment Low Temperature Poly-Silicon (LTPS) Thin Film Transistor (TFT) was established.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Tae Soo Kim, Byoung Woo Lee, Eunsoon Oh, Sanghoon J. K. Furdyna; Carrier transfer from wetting layer to quantum dots studied by cw-resolved time-resolved photoluminescence in CdSe/ZnSe dot system. Appl. Phys. 15 March 2010; 107 (6): 063517. https://doi.org/10.1063/1.3354064 Download citation file: Ris (Zotero)...
We have successfully controlled the number of graphene layers (<italic>n</italic>-layer) by using a Cu–Ni–MgO hetero catalyst having different catalytic activity and carbon solubility.
Adv. Mater. 2022, 34, 2204982 DO: 10.1002/adma.202204982 When originally published, the author name Seungwoo Song was spelled incorrectly. This is hereby corrected as shown in line above; online version of article has also been accordingly.
Graphene, with its unique band structure, mechanical stability, and high charge mobility, holds great promise for next-generation electronics. Nevertheless, zero gap challenges the control of current flow through electrical gating, consequently limiting practical applications. Recent research indicates that atomic oxygen can oxidize epitaxial graphene in a vacuum without causing unwanted damage. In this study, we have investigated effects chemisorbed on electronic properties graphene, using...
A conventional image sensor has been developed to see around the world, but its detection optical spectrum limited by material's bandgap. In article number 2007357, Kibum Kang, SangHyeon Kim and co-workers demonstrate broadband using MoS2/InGaAs van der Waals heterostructure. The of MoS2/InGaAs-based device array will light from visible SWIR bands, which can be used for various inspections such as pests.