A5100605178- Liquid Crystal Research Advancements
- Photonic Crystals and Applications
- Plant Reproductive Biology
- Photonic and Optical Devices
- Advanced Optical Imaging Technologies
- Advanced Materials and Mechanics
- Semiconductor Lasers and Optical Devices
- Phase-change materials and chalcogenides
- Electrowetting and Microfluidic Technologies
- Mechanical and Optical Resonators
- Nonlinear Dynamics and Pattern Formation
- Optical Polarization and Ellipsometry
- Carbon Nanotubes in Composites
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Molecular spectroscopy and chirality
- Graphene research and applications
- Supercapacitor Materials and Fabrication
- Photochromic and Fluorescence Chemistry
- Advanced optical system design
- Advanced Photocatalysis Techniques
- Electrochemical sensors and biosensors
- Synthesis and properties of polymers
- Surfactants and Colloidal Systems
- Advancements in Battery Materials
Jeonbuk National University
2016-2025
Jeonju University
2015-2021
Chonbuk National University Hospital
2006-2020
Pohang University of Science and Technology
2013-2020
Xuchang University
2020
Government of the Republic of Korea
2014-2018
Gyeongnam National University of Science and Technology
2015
Korea Post
2013-2014
Dong-A University
2007-2013
Hongik University
2000-2012
Although polycrystalline hexagonal boron nitride (PC-hBN) has been realized, defects and grain boundaries still cause charge scatterings trap sites, impeding high-performance electronics. Here, we report a method of synthesizing wafer-scale single-crystalline hBN (SC-hBN) monolayer films by chemical vapor deposition. The limited solubility (B) nitrogen (N) atoms in liquid gold promotes high diffusion adatoms on the surface at temperature to provoke circular grains. These further evolve into...
Seamless stitching of graphene domains on polished copper (111) is proved clearly not only at atomic scale by scanning tunnelling microscopy (STM) and transmission electron micoscopy (TEM), but also the macroscale optical after UV-treatment. Using this concept seamless stitching, synthesis 6 cm × 3 monocrystalline without grain boundaries foil possible, which limited chamber size.
A protrusion electrode structure is proposed to dramatically lower the operation voltage of emerging blue-phase liquid crystal displays (BP-LCDs). Simulation results indicate that generated horizontal electric field not only strong but also penetrates deeply into bulk LC layer. As a result, low (∼10 Vrms) and reasonably high transmittance (∼70%) BP-LCD can be achieved. This approach enables BP-LCDs addressed by amorphous silicon thin-film transistors (TFTs). Widespread application TFT foreseeable.
We have fabricated twisted nematic cells doped by carbon nanotubes (CNTs). The CNTs with a minute amount of doping did not perturb the liquid crystal orientation in off and on state. hysteresis studies voltage-dependent transmittance capacitance under ac dc electric field showed that residual dc, which is related to an image sticking problem displays, was greatly reduced due ion trapping CNTs.
In the patterned vertical alignment (PVA) cell in which multidomains are formed from perfect through an oblique field only, formation of disclinations between liquid crystal (LC) molecules is inevitable presence electric field, lowers transmittance and response time. proposed PVA device, pretilt angle four different directions polymerization UV curable reactive mesogen monomer at surface. this way, reorientation LC responding to well defined, thus device shows reduced threshold voltage much...
The fringe-field switching-liquid crystal display (FFS-LCD) mode recently became a major component of LCDs for high resolution, high-image quality, low power consumption, and touch screen suitability. This review paper discusses how the FFS technology was developed, it evolved to its present status, also about future advances in terms performance technologies.
Here, we demonstrated the formation of active sites O<sub>2</sub><sup>−</sup> and O<sup>−</sup> on surface nanocube In<sub>2</sub>O<sub>3</sub>@RGO heterostructure, gas sensing mechanisms fluctuations in potential barrier height before after insertion acetone formaldehyde.
We report the H2 and LPG gas sensing behavior of RGO/SnO2 QDs synthesized by a surfactant assisted hydrothermal method. The QD based sensor shows high response ∼89.3% to ∼92.4% for 500 ppm test concentration at operating temperatures 200 °C 250 °C, respectively. Further, good selectivity in presence other interfering gases such as ammonia, chloroform, toluene, benzene, acetone, n-butylacetate, acetic acid formic acid. observed that is 29.8 times higher than whereas 17.8 Long-term analyses...
Herein, a novel strategy is presented for enhancing light absorption by incorporating gold nanostars (Au NSs) into both the active layer of organic solar cells (OSCs) and rear-contact hole transport perovskite (PSCs). We demonstrate that power conversion efficiencies OSCs PSCs with embedded Au NSs are improved 6 14%, respectively. find pegylated greatly dispersable in chlorobenzene solvent, which enabled complete blending layer. The plasmonic contributions accelerated charge transfer...
The atomic and electronic structures of the tri-fluorophenyl2 (TFP2) liquid crystal (LC) molecule anchored on a carbon nanotube (CNT) wall were investigated by using density functional calculations. TFP2 LC was helically to CNT enhance π−π stacking maximizing hexagon−hexagon interactions between two species. anchoring further strengthened with binding energy nearly −2.0 eV electrostatic due considerable amount charge transfer from CNT. These charges distributed asymmetrically asymmetric...
Polymer-stabilized blue phase liquid crystal displays based on the Kerr effect are emerging due to their submillisecond response time, wide view and simple fabrication process. However, conventional in-plane switching device exhibits a relatively high operating voltage because electric fields restricted in vicinity of electrode surface. To overcome this technical barrier, we propose partitioned wall-shaped configuration so that induced birefringence is uniform between electrodes throughout...
Mobile liquid crystal displays (LCDs), often playing a role in hand-held computers, have become indispensable electronic tools to human beings modern society. Innovative technological developments the devices and materials paved successful road toward development of mobile LCDs. Herein, after reviewing trends performance requirements LCDs, organic–inorganic as key components high LCDs are addressed. Additionally, developing discussed with respect these materials.
Abstract— The recent development of polymer‐induced pretilt angle in multi‐domain vertical‐alignment liquid‐crystal (LC) structures is reviewed. To create a small but well‐defined angle, ∼0.1 wt.% photo‐curable monomer was mixed an LC host and bias voltage applied to reorient the directors within each domain. monomers are polymerized near substrate surfaces by UV exposure. formed polymer layers change surface from 90° about 89° with defined azimuthal orientation. Consequently, domain...
In this paper, a direct switching between transparent (or reflecting) planar (P) state to an opaque transparent) focal conic (FC) and vice-versa of polymer free bistable cholesteric light shutter without any homogeneous polyimide (PI) layer, is demonstrated based on the sign inversion dielectric anisotropy dual frequency liquid crystal (DFLC). The was achieved by applying square wave field at low (1 kHz) high (50 frequency. As result, DFLC sustains bright dark states in electric off exhibits...
A new hybrid nanocomposite based on hydrothermally synthesized nanostructured NiFe2O4 (n-NiFe2O4) and chitosan (CH) has been explored for bienzyme (cholesterol esterase (ChEt) cholesterol oxidase (ChOx)) immobilization application as total biosensor. Results of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM), Fourier transform infrared (FTIR), Raman spectroscopy (RS) vibrating sample magnetometer (VSM) studies demonstrate that the ChEt–ChOx/n-NiFe2O4–CH...
The fringe-field switching (FFS) mode has been widely applied in high-resolution portable liquid crystal displays because of its excellent performances transmittance, viewing angle, and operating voltage. Up to now, the FFS utilised a with positive dielectric anisotropy owing fast response time low This paper proposes merit using negative anisotropy. optimised cell structures thin gap fine patterned electrode make crystals exhibit higher transmittance than that time.