A5021844861- Perovskite Materials and Applications
- Semiconductor materials and devices
- Silicon Carbide Semiconductor Technologies
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- Advancements in Semiconductor Devices and Circuit Design
- Polymer Surface Interaction Studies
- Conducting polymers and applications
- Electronic and Structural Properties of Oxides
- Advanced Polymer Synthesis and Characterization
- Polymer Nanocomposites and Properties
- Ferroelectric and Negative Capacitance Devices
- Polymer crystallization and properties
- Electron and X-Ray Spectroscopy Techniques
- Block Copolymer Self-Assembly
- Advancements in Battery Materials
- ZnO doping and properties
- Advanced Photocatalysis Techniques
- Dark Matter and Cosmic Phenomena
- Nanowire Synthesis and Applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Battery Materials and Technologies
- Chalcogenide Semiconductor Thin Films
- Supercapacitor Materials and Fabrication
- Gas Sensing Nanomaterials and Sensors
Chungnam National University
2016-2025
California University of Pennsylvania
2023-2024
Institute for Basic Science
2023-2024
Ulsan National Institute of Science and Technology
2024
Kyungpook National University
2011-2023
SK Group (South Korea)
2022
Institut polytechnique de Grenoble
2012-2022
Institut de Microélectronique, Electromagnétisme et Photonique
2012-2022
Micro and Nanotechnology Innovation Centre
2012-2022
Korea Advanced Institute of Science and Technology
2022
Surface-initiated atom transfer radical polymerization (SI-ATRP) has become an indispensable tool for engineering the structure and properties of polymer/inorganic polymer/organic interfaces. This article describes progress challenges that are associated with application SI-ATRP to precisely control molecular characteristics polymer chains tethered nanoparticle surfaces explores potential applications resulting particle brush materials. Even conceptually most "simple" systems—that is,...
The effect of polymer-graft modification on the structure formation and mechanical characteristics inorganic (silica) nanoparticle solids is evaluated as a function degree polymerization surface-grafted chains. A transition from 'hard-sphere-like' to 'polymer-like' particle observed for increasing grafted elastic modulus increases by about 200% levels off at intermediate molecular weights chains, trend that rationalized consequence being determined dispersion interactions between polymeric...
Surface-initiated atom-transfer radical polymerization is used to synthesize particle brushes with controlled fraction of extended and relaxed conformations surface-grafted chains. In the semidilute brush limit, grafting polymeric ligands shown facilitate formation ordered yet plastic-compliant array structures in which chain entanglements give rise fracture through a polymer-like crazing process that dramatically increases toughness flexibility assembly.
The propensity of particle brush materials to form long-ranged ordered assembly structures is shown sensitively depend on the architecture (i.e., radius as well molecular weight and grafting density surface-bound chains). In limit stretched chain conformations surface-grafted chains formation regular array observed interpreted a consequence hard-sphere-type interactions between polymer-grafted particles. As degree polymerization increases beyond threshold value, reduction structural...
Nanoparticles are new and valuable additives that can favorably tune thermomechanical, electric, optical, magnetic properties of polymeric materials. The addition nanoparticles also enhance or slow down polymer dynamics depending on the mixture thermodynamics key length scales, namely, nanoparticle size, interparticle spacing (ID), radius gyration (Rg). Presently, a framework for understanding how affect is not available, in part, because lack wide-ranging experimental studies. Here, tracer...
Organolead halide perovskite nanocrystals (NCs) have emerged as promising materials for various optoelectronic applications. However, their practical applications been limited due to low structural integrity and poor luminescence stability associated with fast attachment-detachment dynamics of surface capping molecules during postprocessing. At present, a framework understanding how the functional additives interact moieties organolead perovskites is not available. Methylammonium lead...
Capacitive deionization (CDI) is a promising technique that can be applied to the removal ions of radioactive liquid waste. Carbon-based electrodes, which are mainly used in CDI systems, show limited characteristics due their inferior selectivity and adsorption performance target components present feed water. Prussian blue analogues (PBAs) proposed as an electrode material operates by reversible redox reaction, provides strategy efficiently remove cesium (Cs) from aqueous solutions owing...
Carbon molecular sieve (CMS) membranes are considered game-changers to overcome the challenges that conventional polymeric face. However, CMS also confront a challenge in successfully separating extremely similar-sized molecules. In this article, high-precision tuning of microstructure is proposed by controlled electron irradiation for separation molecules with size differences less than 0.05 nm. Fitting targeted can be accomplished dosage control, resulting highly-efficient C2H4/C2H6 low...
Abstract Hybrid nanoparticles with a silica core and grafted poly(methyl methacrylate) (PMMA) or poly( n ‐butyl (PBMA) chains were prepared via activators generated by electron transfer for atom radical polymerization (AGET ATRP) at room temperature under high pressure. Due to enhanced propagation rate constant reduced termination polymerizations conducted pressure, the of was increased, while preserving good control over when compared ATRP ambient Molecular weights greater than 1 million...
The effect of polymer modification on the deformation characteristics and processibility particle assembly structures is analyzed as a function size degree polymerization surface-tethered chains. A pronounced increase fracture toughness (by approximately one order magnitude) observed exceeds threshold value that increases with size. interpreted being related to transition tethered chains from stretched-to-relaxed conformation (and associated entanglement chains) agrees predictions scaling...
Organometal halide perovskites become important in the photovoltaic and light emitting devices due to compositional flexibility with AMX3 formula (A is a monovalent organic ammonium cation; M metal ion; X halogen atom), imposing significant demand develop synthetic route toward new types of nanocrystals. Although chemical pathways for nanoparticles were developed on basis reprecipitation method, poor control nucleation growth process results large size polydispersity that induces ambiguities...
A simple and robust platform, based on polymer-grafted nanoparticles to facilitate a controlled morphology of nano-fillers, provides route for strategically designing nanostructured EM wave absorbers with percolated MWCNT network as well NP arrangement.
The scalable synthesis of colloidal organohalide perovskite nanocrystals is essential because increasing demands for their use in many applications such as photovoltaic and light-emitting devices. However, only subgram quantities were produced the typical precipitation involving excess amounts nonsolvent, limiting high-yield production. In this contribution, ligand-assisted ball milling represents a substantial improvement scalability high quality well corresponding optoelectronic properties...
We report an extensive high-sensitivity search for axion dark matter above 1 GHz at the Center Axion and Precision Physics Research (CAPP). The cavity resonant search, exploiting coupling between axions photons, explored frequency (mass) range of 1.025 (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>4.24</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi mathvariant="normal">μ</a:mi><a:mi>eV</a:mi></a:mrow></a:math>) to 1.185 (<d:math...
We show that polymer diffusion in nanocomposites (PNCs) is controlled by the architecture of brushes grafted to hard spherical nanoparticles (NPs). At high grafting density, diffusing chains are excluded from brush leading greater confinement. However, at lower these penetrate and similar NP case, compared same loading. calculate effective interparticle spacing (IDeff) modeling penetration into using self-consistent field theory. When plotted against a confinement parameter (IDeff/2Rg, where...
Nanorod diffusion in polymer melts is faster than predicted by the continuum model (CM). Rutherford backscattering spectrometry used to measure concentration profile of titanium dioxide (TiO2) nanorods (L = 43 nm, d 5 nm) a polystyrene (PS) matrix having molecular weights (M) from 9 2000 kDa. In entangled regime, tracer coefficients (D) TiO2 decrease as M–1.4, whereas CM predicts DCM ∼ M–3.0 using measured zero-shear viscosity TiO2(1 vol %): PS(M) blends. By plotting D/DCM versus M/Me, where...
The in-plane and out-of-plane elastic properties of thin films "quasi-one-component" particle-brush-based nanocomposites are compared to those "classical" binary particle–polymer nanocomposite systems with near identical overall composition using Brillouin light scattering. Whereas phonon propagation is found be independent the direction for particle/polymer blend systems, a pronounced splitting velocity along film observed particle-brush systems. anisotropic quasi-one-component interpreted...