A5020489229- Block Copolymer Self-Assembly
- Dendrimers and Hyperbranched Polymers
- Liquid Crystal Research Advancements
- 2D Materials and Applications
- Supramolecular Self-Assembly in Materials
- Graphene research and applications
- Organic Electronics and Photovoltaics
- Advanced Materials and Mechanics
- Advanced Polymer Synthesis and Characterization
- Photonic Crystals and Applications
- Advanced Sensor and Energy Harvesting Materials
- Surface Chemistry and Catalysis
- Advanced Photocatalysis Techniques
- Polymer Surface Interaction Studies
- Membrane Separation Technologies
- Luminescence and Fluorescent Materials
- Gas Sensing Nanomaterials and Sensors
- Anodic Oxide Films and Nanostructures
- Force Microscopy Techniques and Applications
- Conducting polymers and applications
- Material Dynamics and Properties
- Pickering emulsions and particle stabilization
- Advanced Memory and Neural Computing
- Nanofabrication and Lithography Techniques
- CO2 Reduction Techniques and Catalysts
Samsung (South Korea)
2021-2024
Korea Advanced Institute of Science and Technology
2017-2023
University of Chicago
2019-2021
Daejeon University
2017-2018
Kootenay Association for Science & Technology
2018
Government of the Republic of Korea
2017
Electronics and Telecommunications Research Institute
2002-2009
Forschungszentrum Telekommunikation Wien
2007
Abstract The main gas‐sensing mechanisms of 2D materials are surface charge transfer by analytes and Schottky barrier (SB) modulation at the interface between metallic semiconducting surfaces. In particular, dramatic differences in performances originate from SB modulation. However, sites typically exist only channel material metal electrode. Herein, situ formed multiple SBs a single demonstrated, which derived heterojunction Ti 3 C 2 TiO . stark contrast with previous techniques,...
This study provides a significant enhancement in CO2 photoconversion efficiency by the functionalization of reduced graphene oxide/cadmium sulfide composite (rGO/CdS) with amine. The amine-functionalized graphene/CdS (AG/CdS) was obtained two steps. First, oxide (GO) selectively deposited via electrostatic interaction CdS nanoparticles modified 3-aminopropyltriethoxysilane. Subsequently, ethylenediamine (NH2C2H4NH2) grafted an N,N′-dicyclohexylcarbodiimide coupling reaction between amine...
Abstract Use of Cu and + is one the most promising approaches for production C 2 products by electrocatalytic CO reduction reaction (CO RR) because it can facilitate activation CC dimerization. However, selective electrosynthesis 2+ on 0 Cu interfaces critically limited due to low ethanol relative ethylene. In this study, a novel porous Cu/Cu O aerogel network introduced afford high productivity RR. The synthesized simple chemical redox precursor reducing agent. RR results reveal that...
Precise control of the size and interfaces Pd grains is very important for designing a high-performance H2 sensing channel because transition phase from α to β occurs through units single grains. However, unfortunately, grain controllability previous approaches has been limited exceeding 10 nm in simple macroscopic structures have only shown monotonic response behavior wide concentration range H2. In this work, first time, we found that channels are precisely grain-controlled show different...
Chemically patterned surfaces can be used to selectively stabilize blue phases as macroscopic single crystals with a prescribed lattice orientation. By tailoring the interfacial free energy through pattern characteristics, it is possible set, nanoscale precision, optimal conditions induce spontaneously blue-phase crystal nucleation on substrate where uniform, defect-free, finally formed in matter of seconds. The chemical patterns taken into consideration this work are made up alternated...
Herein, a new carbon-based graphitic membrane composed of laminated nanoribbons with nanometer-scale width and micrometer-scale length, the nanoribbon membrane, is reported. Compared to existing membranes, such as those graphene oxide carbon nanotubes, developed exhibits several unique characteristics in pressure-driven systems. First, short diffusion length through its interlayer free volume stacked result high solvent flux regardless polarity (water: 25-250 L m-2 h-1 bar-1; toluene: ∼975...
Soft heteroepitaxy can produce sculpted grain boundaries with molded liquid-liquid interfaces and distortion-free soft crystals.
Controlling molecular self-assembly of organic semiconductors is a key factor in enhancing the performance electronics and optoelectronics. However, unlike various p-type semiconductors, it has proven elusive to control with about tens nm dimensions using n-type including perylene diimide (PDI), which most promising alternative fullerene derivatives, without an additional synthetic method or additives, thus far. Here, we developed simple self-assembling for hierarchical PDI crystals...
Abstract A Z‐scheme graphitic carbon nitride (g‐C 3 N 4 )/α‐Fe 2 O has been incorporated into a three‐dimensional porous graphene aerogel. Graphene aerogels are promising framework in their use for practical photocatalysis by abundant reaction sites, efficient mass transport of reactants and recyclability through free‐standing framework. At the same time, charge transfer among g‐C , α‐Fe conductive inhibits rapid recombination photoinduced electrons holes. Ternary N4/α‐Fe /graphene (CNFGA)...
Abstract The direct synthesis of inherently defect‐free, large‐area graphene on flexible substrates is a key technology for soft electronic devices. In the present work, in situ plasma‐assisted thermal chemical vapor deposition implemented order to synthesize 4 in. diameter high‐quality directly 10 nm thick Ti‐buffered at 100 °C. synthesized monolayer displays outstanding stretching properties coupled with low sheet resistance. Further improved mechanical and performances are achieved by...
As wafer manufacturing shrinks size and pitch of features, EUV lithography introduces high NA, the control photomask pattern placement error that contributes to overlay becomes a critical requirement for leading-edge devices. For sub-3nm node devices, complexity has increased exposure dose also risen due use low-sensitivity resist. Accordingly, improve fidelity reduce time, masks are manufactured using Multi-Beam Mask Writer (MBMW). result analyzing mask budget main resist device, e-beam...
Strong acidic gases such as CO2, SO2, and NO2 are harsh air pollutants with major human health threatening factors, such, developing new tools to monitor quickly sense these is critically required. However, it difficult selectively detect the single channel material due similar chemistry shared by molecules. In this work, three (i.e., NO2) discriminated using precise moiety design. By changing composition ratio of primary (1°), secondary (2°), tertiary (3°) amines polyethylenimine (PEI) on...
Abstract Directed self‐assembly (DSA) using soft materials is an important method for producing periodic nanostructures because it a simple, cost‐effective process fabricating high‐resolution patterns. Most of the previously reported DSA methods exploit block copolymers, which generates wide range nanostructures. In this study, cylinders obtained from supramolecular dendrimer films with high resolution (<5 nm) exhibit planar ordering over macroscopic area via guiding topographical...
Abstract Controlling the orientation of highly periodic supramolecular structures small feature size (<5 nm) is first step for potential applications in optoelectronics, membranes, and template synthesis. A new method, namely, laser photothermal writing, introduced to direct columns over a large area. Supramolecular consisting taper‐shaped molecules with long aliphatic tail groups are aligned by thermal gradient, which induced exposing near‐infrared beam graphene conversion layer....
Precisely controlling the growth of crystals self-assembled conjugated polymers (CPs) in organic thin films remains challenging. Here, we designed a new efficient procedure for CP that involved using solution annealing process to fabricate on surface water. In initial stage this procedure, seed were formed by administering drop CPs onto water and then allowing solvent evaporate. Then, when repeated several times, obtained film composed highly crystalline nanowires. By varying number times...
In nanotechnology and microelectronics research, the generation of an ultradense, single-grain nanostructure with a long-range lateral order is challenging. this paper, we report upon new solvent-annealing method using double-sandwich confinement to promote formation large-area, single-domain array (>0.3 × 0.3 mm2) supramolecular cylinders small feature size (4.7 nm). The in situ GISAXS experiment result shows ordering process during solvent evaporation. diffusion molecules led disassembly...
The correlation length of blue phases—defined as the distance over which same BP-lattice orientation is maintained—is revealed along different kinetic pathways and time evolution by liquid epitaxial growth.
The fabrication of an ultra-dense, highly periodic nanoparticle array from a soft template is one the most important issues in fields material science and nanotechnology. To date, block copolymer (BCP) structures have been primarily used as templates for fabricating arrays with high areal densities. Herein, we demonstrate first time use supramolecular dendrimer assembly formation ordered density ~20 Tdot/in2, four times larger than that currently reported BCP-based arrays. By simple thermal...
Abstract A compact aperture coupled patch type microstrip‐to‐waveguide transition at V‐band is proposed and fabricated using low‐temperature cofired ceramic process. It uses the microstrip feed parasitic antenna radiating into waveguide to improve insertion loss bandwidth. As a result of experiments, low‐transmission high‐return are realized design frequency 60 GHz. For 10‐dB return loss, relative bandwidth 13.8% obtained for back‐to‐back transition. © 2009 Wiley Periodicals, Inc. Microwave...
We map the lattice orientation of graphene grains (domains) larger than a centimeter by measuring cracks in WS2 film grown on that had been previously chemical vapor deposition (CVD) Cu foils. A WO3 was first deposited and then converted to CVD sulfurization. The found contain that, as electron diffraction optical birefringence, are always aligned along armchair direction lattice. find this method is significantly advanced compared any published methods for analysis grain structure, it...
We present aqueous dispersions of conjugated polymer nanowires (CPNWs) with improved light absorption properties aimed at aqueous-based applications. assembled films a donor-acceptor-type and liquid crystalline 4-