A5100359574- Graphene research and applications
- Quantum and electron transport phenomena
- ZnO doping and properties
- Topological Materials and Phenomena
- Nanoparticles: synthesis and applications
- Catalytic Processes in Materials Science
- Gold and Silver Nanoparticles Synthesis and Applications
- Ga2O3 and related materials
- Nanoplatforms for cancer theranostics
- Gas Sensing Nanomaterials and Sensors
- Porphyrin Metabolism and Disorders
- Porphyrin and Phthalocyanine Chemistry
- 2D Materials and Applications
- Copper-based nanomaterials and applications
- GaN-based semiconductor devices and materials
- Thin-Film Transistor Technologies
- Electrospun Nanofibers in Biomedical Applications
- Luminescence and Fluorescent Materials
- Surgical Sutures and Adhesives
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Chalcogenide Semiconductor Thin Films
- Silk-based biomaterials and applications
- Shape Memory Alloy Transformations
- Structural mechanics and materials
Kyungpook National University
2024
Kangwon National University
2009-2024
Yeungnam University
2022-2024
Hanmi Pharmaceutical (South Korea)
2024
University of Ulsan
2021-2022
Korea Institute of Industrial Technology
2022
California Institute of Technology
2021
Kumoh National Institute of Technology
2020
National Cancer Center
2017-2019
Seoul Women's University
2015-2016
Gold nanoparticles (Au-NPs) have promising potential for diverse biological application, but it has not been completely determined whether Au-NP toxicity in vitro and vivo. In the present study, of was evaluated human intestinal cells as well rats after 14-day repeated oral administration. Biokinetic study also performed to assess absorption tissue distribution. The results demonstrated that did cause cytotoxic effects on 24 h exposure terms inhibition cell proliferation, membrane damage,...
We report a photoactivatable fluorophore that relies on the conversion of dark meso-ester-BODIPY to an emissive meso-carboxylate-BODIPY. The process is triggered by photolysis aryl azide amine, which occurs in high photochemical yield, and does not release toxic nitroso photoproducts. Its utility demonstrated platforms simultaneously upon irradiation both bioactive molecule dye, resulting approximate 1250-fold luminescence increase.
The interface between nanostructured materials and plant cell organelles, such as chloroplasts, has been recently found to have potential impart organelles with new functions enhanced performances. nanobionics-based technologies can be implemented provide the precise quantity of nutrients pest control systems improve crop productivity concerns are growing regarding various agricultural difficulties poor nutrient use, stagnant yields, deficiencies, climate change, water scarcity. creation...
Background: Naturally derived sustainable biomaterials with high flexibility, mechanical properties, biocompatibility, and the ability to manipulate surface chemistry, providing a natural cellular environment, can be used for tissue engineering applications. However, only few researchers have demonstrated exploitation of architectures constructing three-dimensional scaffolds. The chemical decellularization technique fabricating scaffolds their cytocompatibility assessment applications need...
Meso-alkylidenyl-thia(p-benzi)porphyrin and its ring expanded analog containing exocyclic C–C double bonds at meso-positions, undergo initial protonation the alkylidene α-carbon.
Magic-angle twisted bilayer graphene (MATBG) exhibits a range of correlated phenomena that originate from strong electron-electron interactions. These interactions make the Fermi surface highly susceptible to reconstruction when $ \pm 1, 2, 3$ electrons occupy each moir\' e unit cell and lead formation insulating, superconducting ferromagnetic phases. While some phases have been shown carry non-zero Chern number, local microscopic properties topological character many other remain elusive....
Magic-angle twisted trilayer graphene (MATTG) has emerged as a novel moir\'e material that exhibits both strong electronic correlations and unconventional superconductivity. However, spectroscopic studies of its properties are lacking, the nature superconductivity corresponding order parameter in this system remain elusive. Here we perform high-resolution scanning tunneling microscopy spectroscopy MATTG reveal extensive regions atomic reconstruction favor mirror-symmetric stacking. In these...
Graphene moire superlattices have emerged as a platform hosting and abundance of correlated insulating, topological, superconducting phases. While the origins strong correlations non-trivial topology are shown to be directly linked flat bands, nature mechanism superconductivity remain enigmatic. In particular, only alternating twisted stacking geometries bilayer trilayer graphene found exhibit robust manifesting zero resistance Fraunhofer interference patterns. Here we demonstrate that...
Crystal gazing: A simple Pd-catalyzed site-specific nanoetching method was developed to visualize the polycrystalline nature of Fe(3)O(4) (see picture), Fe(2)O(3), MnFe(2)O(4), CoFe(2)O(4), and MnO nanoparticle systems. The technique relies on very fast etching speed grain interface within bi- or nanocrystals.
The field emission (FE) properties of ZnO and NiO-coated (NiO∕ZnO) nanorods are investigated under vacuum 7×10−7Torr oxygen rich 1×10−5Torr. were synthesized on a Si(100) substrate by metal-organic chemical vapor deposition, the NiO film with thickness ∼15nm was coated using atomic layer deposition. turn-on voltages NiO∕ZnO nanorod ∼5.2 ∼3.0V∕μm at 1μA∕cm2, respectively. electron FE stability to significantly improved in even.
Despite many efforts over the last few decades, cardiac-based drug delivery systems are experiencing major problems, such as effective of precise amount a drug. In current study, an effort has been made to prepare nano-herbformulation (NHF) overcome problem conventional intervention. Copper oxide-based NHF was prepared using plant extract Alternanthera sessilis and characterized physicochemical techniques Transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Dynamic light...
meso-diethylmalonylidene-(1,4-naphthi)thiaporphyrin containing exocyclic C – double bonds at meso-positions has been synthesized and characterized. The compound undergoes initial protonation the α-position of diethylmalonyl group with large red shifted absorption maxima. second occurs a meso-position to give species broken cross-conjugation.
Twisted bilayer graphene (TBG) near the magic twist angle of $\sim1.1^{o}$ exhibits a rich phase diagram. However, interplay between different phases and their dependence on is still elusive. Here, we explore stability various TBG demonstrate that superconductivity filling two electrons per moir\'e unit cell alongside Fermi surface reconstructions, as well entropy-driven high-temperature transitions linear-in-T resistance occur over range angles which extends far beyond those exhibiting...
This study investigates the effect of ratio hydrophobic to hydrophilic ligands on surface gold nanoparticles (AuNPs) adsorption AuNPs at hexane–water interface. Depending ratio, experimental results showed different behaviors amphiphilic Thus, several isotherm models were employed characterize behaviors. The Langmuir model describes homogeneous monolayer with ratios 0.41 and lower. Freundlich heterogeneous multilayer higher. Redlich–Peterson is capable fitting data for all ratios. Using...
Abstract We investigate the physical integration of organic thin film semiconductors with (In)GaN to explore new types “hybrid” heterojunction device structures. Planar nitride‐organic junctions are found be quite versatile in enabling charge injection across two very different electronic material constituents. Here (In)GaN/CuPc devices were studied terms photogenerated transport. An efficient photocurrent response was observed at absorption wavelength InGaN quantum well which requires ready...
(1) Background: Application of nanotechnology or nanomaterials in agricultural food crops has attracted increasing attention with regard to improving crop production, quality, and nutrient utilization. Gold nanoparticles (Au-NPs) have been reported enhance seed yield, germination rate, anti-oxidant potential crops, raising concerns about their toxicity potential. In this study, we evaluated the oral red ginseng exposed colloidal Au-NPs during cultivation (G-red ginseng) rats intestinal...
Novel ZnO nanocone anti-reflective coating (ARC) was realized on ITO-Si metal–insulator–semiconductor (MIS) photodetector. The nanocone-coated device demonstrated significant suppression of reflectance compared with that a conventional planar device. MIS photodetector showed 15% enhanced external quantum efficiency (EQE) to photodetector, and indicated flat response over broad range wavelength from the visible IR spectra. In addition, EQE exhibited stable respect angle incidence, which...