A5084387078- Advanced Photocatalysis Techniques
- Graphene research and applications
- Supercapacitor Materials and Fabrication
- Graphene and Nanomaterials Applications
- Electrocatalysts for Energy Conversion
- Organometallic Complex Synthesis and Catalysis
- Carbon dioxide utilization in catalysis
- Carbon and Quantum Dots Applications
- Advancements in Battery Materials
- biodegradable polymer synthesis and properties
- Catalytic Processes in Materials Science
- Conducting polymers and applications
- Advanced battery technologies research
- Copper-based nanomaterials and applications
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Electrochemical sensors and biosensors
- Nanomaterials for catalytic reactions
- Advanced Nanomaterials in Catalysis
- TiO2 Photocatalysis and Solar Cells
- Advanced biosensing and bioanalysis techniques
- Catalysts for Methane Reforming
- Ga2O3 and related materials
- Ammonia Synthesis and Nitrogen Reduction
- Metal-Organic Frameworks: Synthesis and Applications
University of Ulsan
2015-2024
Center for Research and Advanced Studies of the National Polytechnic Institute
2023
Pusan National University
2020
Ulsan College
2015-2017
Government of the Republic of Korea
2015-2017
Ulsan University Hospital
2004-2017
National Alliance on Mental Illness
2015
University of Wollongong
2014
Polymer Research Institute
2014
ARC Centre of Excellence for Electromaterials Science
2014
The development of high-performance shielding materials against electromagnetic pollution requires mobile charge carriers and magnetic dipoles. Herein, we meet the challenge by building a three-dimensional (3D) nanostructure consisting chemically modified graphene/Fe3O4(GF) incorporated polyaniline. Intercalated GF was synthesized in situ generation Fe3O4 nanoparticles graphene oxide suspension followed hydrazine reduction, further polymerization with aniline to form polyaniline composite....
We report a simple and effective method for reducing functionalizing graphene oxide into chemically converted by solvothermal reduction of suspension in N-methyl-2-pyrrolidone (NMP). Graphene sheets were functionalized free radicals generated during heating NMP the presence air. The degree functionalization was easily controlled manipulating time. High solvothermally reduced (STRG) shows superior dispersibility various organic solvents, while slightly STRG excellent electrical conductivity....
We report a simple, environmentally friendly approach for preparing highly conductive poly(methyl methacrylate)–reduced graphene oxide (PMMA-RGO) composites by self-assembly of positively charged PMMA latex particles and negatively sheets through electrostatic interactions, followed hydrazine reduction. The was prepared surfactant-free emulsion polymerization using cationic free radical initiator, which created the positive charges on surface particle. By mixing with dispersion, easily...
In this report, we describe the structure of a robust and highly conductive 3D graphene oxide hydrogel. The reduced hydrogel or rGH is fabricated by crosslinking reaction with ethylene diamine followed hydrazine reduction. material showed high electrical conductivity 1351 S m−1 specific surface area 745 m2 g−1 10.3 MPa break strength. When used as electrodes for supercapacitor, it capacitance 232 F g−1.
One of the major challenges in chemical reduction graphene oxide is increasing C/O atomic ratio chemically converted graphene. In this paper, we report a simple and effective method to reduce aqueous suspensions using nascent hydrogen generated situ by reaction between Al foil HCl, NaOH Zn powder NaOH. The hydrogen-reduced oxides (nHRGOs) were characterized elemental analysis, UV-vis spectra, Raman X-ray photoelectron spectroscopy, thermogravimetric analysis electrical conductivity...
Composites of graphene in a chitosan-lactic acid matrix were prepared to create conductive hydrogels that are processable, exhibit tunable swelling properties and show excellent biocompatibility. The addition the polymer also resulted significant improvements mechanical strength hydrogels, with just 3 wt% resulting tensile strengths increasing by over 200%. composites could be easily processed into three-dimensional scaffolds finely controlled dimensions using additive fabrication techniques...
Abstract Herein, a facile, one‐step hydrothermal route to synthesize novel all‐carbon‐based composites composed of B‐doped graphene quantum dots anchored on hydrogel (GH‐BGQD) is demonstrated. The obtained GH‐BGQD material has unique 3D architecture with high porosity and large specific surface area, exhibiting abundant catalytic active sites B‐GQDs as well enhanced electrolyte mass transport ion diffusion. Therefore, the prepared exhibit superior trifunctional electrocatalytic activity...
Abstract The development of robust nano‐ and microstructured catalysts on highly conductive substrates is an effective approach to produce active binder‐free electrodes for energy conversion storage applications. As a result, nanostructured with designs have abundant advantages that provide superior electrocatalytic performance; these include more exposed sites, large surface area, strong adhesion substrates, facile charge transfer, high conductivity, intrinsic catalytic activity,...
Chemically converted graphene that was reduced with phenylhydrazine highly dispersed in organic solvents, and its "paper" prepared by filtration of the possessed an electrical conductivity value as high 20,950 S m(-1).
An efficient active material for supercapacitor electrodes is prepared by reacting potassium hydroxide (KOH) with graphene oxide followed chemical reduction hydrazine. The electrochemical performance of KOH treated reduced 24 h (reduced chemically modified oxide, RCMGO-24) exhibits a specific capacitance 253 F g-1 at 0.2 A in 2 M H2SO4 compared to value 141 (RGO-24), and good cyclic stability up 3,000 cycles. Interestingly, RCMGO-24 demonstrated higher excellent cycle due its residual oxygen...
The ultra-low density graphene xerogel was prepared through the chemical reduction of oxide suspension using a hypophosphorous acid-iodine mixture. chemically converted (CCGX) exhibited superior electrical conductivity (up to 500 S m(-1)) and high C/O atomic ratio (14.7), which were highest values reported for graphene-based xerogel.
(a)–(c) FE-SEM images of CuO nanoplates on Ni foam, flower-shaped and bud-shaped CuO. (d) Specific capacitance (e) Ragone plots power density<italic>vs.</italic>energy density according to electrodes in an asymmetrical device.
A series of biobased polyurethane–siloxane cross-linked coatings were prepared using castor oil, partially Tolonate, and 3-aminopropyl trimethoxysilane. The 29Si NMR spectra was used to determine the formation cross-linking structure system. FT-IR studies verified that a hydrogen bonding interaction existed at interface oil-based moieties, thereby shifting characteristic peak position N–H C═O groups higher field values. curing process dispersions followed by means gel content measurements....