A5090865245- Gold and Silver Nanoparticles Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Plasmonic and Surface Plasmon Research
- Catalytic Alkyne Reactions
- Advanced Photocatalysis Techniques
- CO2 Reduction Techniques and Catalysts
- Advanced biosensing and bioanalysis techniques
- Advanced battery technologies research
- Synthetic Organic Chemistry Methods
- Quantum Dots Synthesis And Properties
- Nanocluster Synthesis and Applications
- Catalytic C–H Functionalization Methods
- Conducting polymers and applications
- Electrochemical Analysis and Applications
- Silicon Nanostructures and Photoluminescence
- Nanomaterials for catalytic reactions
- Organic Electronics and Photovoltaics
- Polymer Surface Interaction Studies
- Adolescent Sexual and Reproductive Health
- Asymmetric Hydrogenation and Catalysis
- Oxidative Organic Chemistry Reactions
- Advanced Thermoelectric Materials and Devices
- Semiconductor materials and devices
- Risk Perception and Management
- Animal Virus Infections Studies
Chonnam National University
2025
RIKEN Center for Sustainable Resource Science
2021-2024
Gwangju Health University
2024
Ewha Womans University
2011-2023
Hanyang University
2008-2023
Ewha Womans University Medical Center
2012-2018
Seoul Institute
2017-2018
Chungbuk National University
2017
Korea Institute of Energy Research
2013
Korea University
2012
Just another Mannich Monday: A cascade intramolecular redox-pinacol-Mannich-Michael reaction sequence catalyzed by gold complexes can be used to generate a variety of structures including spirocycles, 1-aminoindanes, and 5,6-fused azabicycles that have quaternary carbon center. The is characterized complete atom-economy, high diastereoselectivity, remarkable efficiency through tandem reactions.
Abstract Hierarchically organized porous carbonized‐Co 3 O 4 inverse opal nanostructures (C‐Co IO) are synthesized via complementary colloid and block copolymer self‐assembly, where the triblock Pluronic P123 acts as template carbon source. These highly ordered with high surface area display synergistic properties of energy density promising bifunctional electrocatalytic activity toward both oxygen reduction reaction (ORR) evolution (OER). It is found that as‐made C‐Co IO/Ketjen Black (KB)...
In recent years, the electroreduction of CO2 to valuable products has emerged as a rational answer rising emissions and strategic approach incorporate renewable electricity from intermittent sources (e.g., wind solar) into global energy supply. The reduction CO been highlighted in widely explored industrial conversion syngas (CO H2) fuels. Herein, we report promising electrocatalyst incorporating well-dispersed gold nanoparticles (Au NPs) on ultrathin titanate nanosheets (TiNS). By tuning...
The use of graphene in conventional plasmonic devices was suggested by several theoretic research studies. However, the existing studies are not consistent with one another and experimental still at initial stage. To reveal role graphenes on sensors, we deposited oxide (GO) reduced (rGO) thin films Au their refractive index (RI) sensitivity compared for first time SPR-based sensors. deposition GO bilayers number L from 1 to 5 carried out alternative dipping substrate positively- negatively...
Cost-effective durable and highly active electrode materials have become greatly desirable in the electrocatalytic oxygen reduction reaction (ORR), a crucial element energy devices. In particular, low intrinsic conductivity poor reactivity of TiO2 are believed to hinder efficient applicability this material as an ORR catalyst. Herein, we report for first time one-step approach synthesize conductive Ti3+ self-doped carbon-coated anchored on reduced graphene oxide (rGO) hollow nanospheres. A...
<italic>In situ</italic> electrochemical IR study of the CO<sub>2</sub> reduction by inorganic analogues carbon monoxide dehydrogenase (CODH) reveals critical role Ni in activity and selectivity Fe sulfides for reduction.
Mannich und mehr: Eine Sequenz aus intramolekularer Redox-, Pinacol-, Mannich- Michael-Reaktion führt unter Goldkatalyse zu verschiedenartigen Strukturen mit quartären Kohlenstoffzentren, z. B. Spirocyclen, 1-Aminoindanen anellierten 5,6-Azabicyclen. Die Reaktion zeichnet sich durch vollständige Atomökonomie, hohe Diastereoselektivität eine erstaunliche Effizienz aus.
Nanopatterned 2-dimensional Au nanocluster arrays with controlled configuration are fabricated onto reconstructed nanoporous poly(styrene-block-vinylpyridine) inverse micelle monolayer films. Near-field coupling of localized surface plasmons is studied and compared for disordered ordered core-centered NC arrays. Differences in evolution the absorption band field enhancement upon nanoparticle adsorption shown. The experimental results found to be good agreement theoretical studies based on...
Hybrid semiconductor/noble metal nanostructures coupled with responsive polymers were used to probe unique plasmon-mediated photocatalytic properties associated swelling–shrinking transitions in polymer chains triggered by specific external stimuli. Poly(N-isopropylacrylamide) (PNIPAM) brushes anchored on Au films atom transfer radical polymerization and ZnO nanoparticles immobilized the PNIPAM layer explore controlled activity. The plasmon-enhanced activity was dictated two critical...
Transparent conductive electrodes (TCEs) are widely used in a wide range of optical–electronic devices. Recently, metal nanowires (NWs), e.g. Ag and Cu, have drawn attention as promising flexible materials for TCEs. Although the study core–shell NWs, encapsulation/overcoating surface single-metal NWs separately been an object focus literature, herein first time we simultaneously applied both strategies fabrication highly stable Ag–Cu NW-based TCEs by utilization nanoparticles covered with...
Abstract Hard ticks are known vectors of various pathogens, including the severe fever with thrombocytopenia syndrome virus, Rickettsia spp., Coxiella burnetii , Borrelia Anaplasma phagocytophilum, and Ehrlichia spp. This study aims to investigate distribution prevalence tick-borne pathogens in southwestern Korea from 2019 2022. A total 13,280 were collected during period, H. longicornis accounting for 86.1% ticks. flava, I. nipponensis A. testudinarium comprised 9.4%, 3.6%, 0.8% ticks,...
Smart bimetallic core@shell nanoparticles were fabricated based on gold (AuNPs) decorated with pH-sensitive polymer shell. Concretely, AuNPs having poly(4-vinylpyridine) (P4VP) the surface first through surface-initiated atom transfer radical polymerization (SI-ATRP). Then, they mixed selected metal precursor solutions followed by reduction using reducing agent. The NPs thus introduced uniformly distributed in P4VP shells. In order to explore diversity and viable function of resultant...
Ligand exchange of CTAB-protected gold nanorods (AuNRs) with disulfide initiator was found to usually cause nanorod aggregation, but such aggregation could be prevented under the steric hindrance pre-anchored poly(ethylene glycol) thiol. The obtained initiator-modified AuNRs were well-dispersed and initiate in situ atom-transfer radical polymerization (ATRP) 4-vinylpyridine, resulting poly(4-vinylpyridine)-grafted as core–shell structures (AuNR@PVP). These polymer/Au nanocomposites displayed...
Efficient bifunctional electrocatalytic activity for reduction and oxidation reactions based on the AuNP@PANI@PtFe core–multishell nanostructures is presented. The exhibits an enhanced catalytic durability ORR MOR than conventional carbon supported Pt catalysts.
Abstract In recent years, a promising role of plasmonic metal nanoparticles (NPs) has been demonstrated toward an improvement the catalytic efficiency well‐designed hybrid electrocatalysts. particular, coupling functionality with metal‐based core–shell architectures in plasmon‐enhanced electrocatalysis provides sustainable route to improve performances catalysts. Herein, rationally designed AuNPs wrapped reduced graphene oxide (rGO) spacer along PdNPs (AuNP@rGO@Pd) as final composite are...
An efficient hole-transporting layer (HTL) based on functionalized two-dimensional (2D) MoS2-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composites has been developed for use in organic solar cells (OSCs). Few-layer, oleylamine-functionalized MoS2 (FMoS2) nanosheets were prepared via a simple and cost-effective solution-phase exfoliation method; then, they blended into PEDOT:PSS, conducting conjugated polymer, the resulting hybrid film (PEDOT:PSS/FMoS2) was tested as...
Porcine reproductive and respiratory syndrome virus (PRRSV) causes porcine disease (PRRS), a that has significant economic impact on the swine industry. In this study, single-stranded DNA (ssDNA) aptamers with high specificity affinity against VR-2332 strain of PRRSV type II were successfully obtained. Of 19 candidates, LB32 aptamer was found to be most specific sensitive according an aptamer-based surface plasmon resonance (SPR) analysis. The detection accomplished using enzyme-linked...
Synergistic and antagonistic effects emerge during the synthesis of Ni/Ru-based nanostructured electrodes in water splitting electrocatalytic assessment.
Hybrid plasmonic nanostructures comprising gold nanoparticle (AuNP) arrays separated from Au substrate through a temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) linker layer are constructed, and unique plasmonic-coupling-based surface plasmon resonance (SPR) sensing properties investigated. The optical of the model system investigated by in situ scan-mode SPR analysis. swelling-shrinking transitions polymer brush studied contact-mode atomic force microscopy at two different...
The electrochemical reduction of carbon dioxide (CO2) is a promising approach toward the utilization CO2 as feedstock, which desirable for mitigating global warming and closing cycle. Metal sulfides are particularly suited study electrocatalysts because their potential to break scaling relationship due multicomponent characteristics, understanding properties that determine electrocatalytic activity may also provide insights into prebiotic fixation catalyzed by metal sulfide minerals. Here,...
According to recent advancements in additive manufacturing (AM) technology, also known as 3d printing, the role of AM has changed from conventional rapid prototyping (RP) direct fabrication functional parts. The technology based on layer-by-layer a limitation its poor surface finish and mechanical strength, especially along thickness direction. This study proposes new post-processing method for thermoplastic products with goal improving strength. proposed method, called constrained...