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Flexible organo-metal halide perovskite solar cells on Ti metal substrate
이민오,전용석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Organo-metal halide perovskite solar cells have received much attention in the field of photovoltaics in recent years. Here, we report that a flexible perovskite solar cell based on metal substrate. It showed a power conversion efficiency of over 6% for the first time using a silver thin film as a semi-transparent top electrode on a Ti substrate. The simplicity of the fabrication procedure can lower manufacturing costs and widen its applications to flexible devices without the use of ITO/FTO.
Facile synthesis of reduced graphene oxide-encapsulated metal and metal oxide nanoparticles
이민오,전용석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Graphene-based hybrid composites have offered significantly improved performance for various applications including optoelectronic devices, biosensor devices, lithium ion batteries, catalyst and surface enhanced Raman spectroscopy substrates due to their unique properties such as good optical and electrical property and high specific surface area. Among them, the graphene/gold nanomaterial composites have been attractive attention in recent years because of their new optical, electrical, and catalytic properties. In this presentation, we present a simple approach for the fabrication of reduced graphene oxide-encapsulated gold , iron oxide, and titanium oxide nanoparticles using graphene oxide sheet-wrapping via electrostatic self-assembly. By mixing bovine serum albumin molecule-functionalized nanoparticles with graphene oxide dispersion, positively charged bovine serum albumin/nanoparticles easily assembled with negatively charged graphene oxide sheets through electrostatic interaction. Transmittance electron microscopy, scanning electron microscopy, atomic force microscopy, and Raman spectroscopy were used to confirm the encapsulation of graphene oxide on gold, iron oxide, and titanium nanoparticles.
Graphene decorated V<sub>2</sub>O<sub>5</sub> nanobelts for supercapacitor applications
이민오,전용석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A facile one-step low temperature hydrothermal method was adopted to the synthesis of graphene-decorated V<sub>2</sub>O<sub>5</sub> nanobelts (GVNBs). The decoration of graphene enhanced the conductivity of GVNBs. From the electron energy loss spectroscopy analysis, reduced graphene oxide (rGO) sheets are inserted into the layered crystal structure of V<sub>2</sub>O<sub>5</sub> which further enhanced the conductivity of V<sub>2</sub>O<sub>5</sub> nanobelts. The as synthesized material was applied to the electrochemical energy storage applications. The vanadium rich composition of GVNBs showed high specific capacitance. The long term cyclic stability and the capacitance retention of 82% even after 5000 cycles revealed that GVNBs could be a promising candidate for supercapacitor applications.
이민오,전용석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Wearable electronic devices, such as e-textiles, are of great interest due to their potential applications in portable electronic devices, in multifunctional fabrics, including healthcare units and wearable displays, and even in warfare. To satisfy commercial demands, an e-textile must be conductive as well as strong, highly elastic, mechanically flexible, wearable, and lightweight. Carbon-based materials are good candidates and are highly interesting because they satisfy these required characteristics. Highly conductive carbon nanotube (CNT) textiles obtained from the dying process and from polyaniline-carbon nanotubes have been reported. In this presentation, we report a new e-textile that can be prepared as textiles that range from yarn to fabric; the new textile was produced with reduced GO (RGO) and was used to demonstrate the unique properties of RGO/nylon-6 textiles (RGO/NTs). RGO/NTs, including yarn and fabric, were obtained from GO wrapping via electrostatic self-assembly with bovine serum albumin (BSA), which serves as a universal adhesive for improving the adsorption of GO sheets onto a textile, followed by a low-temperature chemical reduction. This method has the advantage of being applicable to the present textile industry because BSA leads to GO being easily attached to textiles that are widely used at present, e.g., nylon, cotton, and polyester. Interestingly, RGO/NTs exhibit a high electrical conductivity (greater than 1000 S/m) that is maintained under severe conditions, such as a large number of repetitive bending cycles, low and high temperatures, and washing.
Reverse structured dye-sensitized solar cells
이민오,전용석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
We report a novel structure of dye sensitized solar cells (DSSC) with reversed form by constructing all the components together at one substrate in order of platinum, titanium dioxide, and indium-doped tin oxide layer. To separate the photoanode from photocathode and make room for electrolytes, silica nanoparticle was introduced. With this new structure, the power conversion efficiency of 5.4% was achieved with comparable current density and open circuit voltage values to conventional structure. Moreover, the present approach could be an encouraging new direction in research while providing for the fabrication of hybrid-tandem solar cells. Dye-sensitized solar cells (DSSCs) are promising alternatives to conventional silicon solar cells and have been studied for the past two decades because of their advantages including color variety, a simple fabrication process, and a relatively high efficiency. Typical DSSCs consist of a TiO<sub>2</sub> working electrode with dye molecules on transparent conductive oxide (TCO) glass, platinum coated counter electrode, and an electrolyte with a I<sup>-</sup>/I<sup>3-</sup> redox system between the electrodes. Extensive researches have been conducted in order that each component to achieve highly efficient DSSCs, including alternative materials, new structures of photoanode, and modifying fabrication method. Currently, fluorine-doped tin oxide (FTO) glass was widely used as TCO for DSSC. Even though the indium-doped tin oxide (ITO) was expected to be a better TCO material than FTO due to higher transparencies and conductivities, the fabrication step for TiO<sub>2</sub> generally requires a 500°C annealing process and so the ITO substrate is not suitable for DSSC application since its conductivity decreases remarkably during the thermal process. Several research proposed to fabricate ITO based DSSCs using poly(ethylene terephthalate) (PET)/ ITO, PET/ITO/Titanium dioxide (TiO<sub>2</sub>), ITO/antimony-doped tin oxide (ATO)/TiO<sub>2</sub>, and StSt/SiOx/ITO. However, these studies are limited to flexible substrate with low temperature process which may show not only poor adhesion between substrate and TiO<sub>2</sub> particles but also poor contact between particles. Here, we introduce a novel structure of DSSCs that utilizes ITO layer without high temperature treatment barrier. Since ITO layer is placed after TiO<sub>2</sub> calcination, high temperature process does not affect ITO layer.
에틸렌옥사이드 노출 이후 발생한 뇌경색을 동반한 가역뇌혈관수축증후군
이민오,박수현,유위선 대한신경과학회 2016 대한신경과학회지 Vol.34 No.3
Reversible cerebral vasoconstriction syndrome (RCVS) is characterized by thunderclap headache and multiple reversible intracranial vasoconstrictions. Here we report a case of RCVS after exposure to ethylene oxide (EO) gas, which is a widely used sterilant. A 34-year-old woman presented with aphasia, right-arm weakness, and severe headache after inhaling EO gas. Brain imaging revealed multiple infarcts and multiple intracranial stenoses. The stenotic lesions completely regressed on follow-up CT angiography. This is the first report of RCVS after exposure to EO gas.