Abstract: A method of manufacturing a thin-film transistor is provided, including preparing ink including a solution in which a graphene oxide, a reduced graphene oxide, or a combination thereof is dispersed, forming the ink on a substrate in the form of a pattern, and forming a source electrode and a drain electrode that are positioned at edges of the pattern and a semiconductor channel positioned between the electrodes by a coffee-ring effect in the ink by using the graphene oxide, the reduced graphene oxide, or the combination thereof within the formed pattern.

Abstract: A method for manufacturing graphene is provided, comprising (1) introducing a supporting substrate in a reactor; (2) preparing (nano) crystalline alumina catalyst having catalytic activity on the supporting substrate to prepare an insulating substrate; (3) growing nano graphenes on the insulating substrate to manufacture graphene film comprising graphene layer of the nano graphenes, which are grown without use of metal catalyst substantially. The graphene layer composed of the nano graphene has spatially homogeneous structural and electrical properties even in synthesis as large area and can be applied to flexible electronic devices. In addition, as it has easy detachment of the substrate and the graphene film and can detach the graphene film without damage of the substrate, leaving no residual graphene on the substrate, it is possible to grow the nano graphene by reusing the substrate.

Abstract: Disclosed is a conductive ink composition, a manufacturing method thereof, and a manufacturing method of a conductive thin film using the same, and more specifically, a conductive ink composition is provided that includes composite metal nanoparticles including first metal nanoparticles and second metal nanoparticles, and a polymer matrix. The polymer matrix is a composition including a polymer and a solvent, the first metal nanoparticles and the second metal nanoparticles are different metals, and the content of the composite metal nanoparticles is about 20 to about 25 wt %, the content of the polymer is about 5 to about 10 wt %, and the content of the solvent is about 65 to about 75 wt %, based on the total weight of the composition.

Abstract: A method of manufacturing a thin-film transistor is provided, including preparing ink including a solution in which a graphene oxide, a reduced graphene oxide, or a combination thereof is dispersed, forming the ink on a substrate in the form of a pattern, and forming a source electrode and a drain electrode that are positioned at edges of the pattern and a semiconductor channel positioned between the electrodes by a coffee-ring effect in the ink by using the graphene oxide, the reduced graphene oxide, or the combination thereof within the formed pattern.

Abstract: Disclosed are a method of manufacturing a reduced graphene oxide pattern which includes forming a graphene oxide pattern on a substrate and providing the graphene oxide pattern with a white light pulse to reduce the graphene oxide, a reduced graphene oxide obtained by the method, and an electronic device and a thin film transistor including the reduced graphene oxide.

Abstract: A method of manufacturing nanoparticles, nanoparticles, and an organic light emitting diode, a solar cell, a printing ink, a bioimaging device, and a sensor including the same are provided. The method of manufacturing nanoparticles of a target material includes mixing graphene oxide with an aqueous solvent to prepare an aqueous solution, mixing the target material with an organic solvent to prepare an organic solution, mixing the aqueous solution with the organic solution, and preparing nanoparticles of the target material by the graphene oxide.

Abstract: Disclosed are a method for forming a metal oxide pattern and a method of manufacturing a thin film transistor using the patterned metal oxide. The method for forming a metal oxide pattern includes: preparing an ink composition including at least one metal oxide precursor or metal oxide nanoparticle, and a solvent; ejecting the ink composition on a substrate to form a pattern on the substrate; and photosintering the formed pattern. Herein, the metal oxide precursor is ionic.

Abstract: Disclosed are a composite electrode active material and a supercapacitor using the same, and more particularly, an electrode active material having M1-xRuxO3 (M=Sr, Ba, Mg) and a supercapacitor using the same, wherein the electrode active material is characterized by comprising M1-xRuxO3, where M is at least one selected from a group consisting of strontium, barium and magnesium, and a method for fabricating a composite electrode active material comprises (a) preparing a spinning solution containing a precursor of M oxide, a precursor of Ru oxide, a polymer and a solvent, (b) spinning the spinning solution on a collector to fabricate a nanofiber web having M1-xRuxO3 precursor, and (c) performing heat treatment for the nanofiber web to remove the polymer so as to make an electrode active material in the structure of porous nanofiber web having M1-xRuxO3, wherein the M comprises at least one selected from a group consisting of strontium, barium and magnesium.

Abstract: An apparatus for oxygen sensing is provided. The apparatus for oxygen sensing includes: a header part to generate interference wave to light generated in a light source by the principle of fiber Fabry-Perot interferometer; and an optical spectrum analyzer to decide existence of oxygen based on change of spectrum periodicity of the above interference wave, in which the header part includes a sensing material of which effective refractive index changes by combination with the oxygen and the above interference wave changes its spectrum periodicity depending on change of effective refractive index of the above sensing material.

Abstract: Disclosed are a method of manufacturing a light-absorption layer for a solar cell, a method manufacturing a thin film solar cell using the same, and a thin film solar cell fabricated using the same. The method of manufacturing a light-absorption layer for a solar cell includes: preparing an ink composition including at least one metal precursor including at least one chalcogen element and a solvent; applying the ink composition as a precursor phase on a substrate using a solution process; and photo-sintering the ink composition applied on the substrate as a precursor phase.

Abstract: Disclosed are a method for forming a metal oxide pattern and a method of manufacturing a thin film transistor using the patterned metal oxide. The method for forming a metal oxide pattern includes: preparing an ink composition including at least one metal oxide precursor or metal oxide nanoparticle, and a solvent; ejecting the ink composition on a substrate to form a pattern on the substrate; and photosintering the formed pattern. Herein, the metal oxide precursor is ionic.

Abstract: Disclosed is a conductive ink composition, a manufacturing method thereof, and a manufacturing method of a conductive thin film using the same, and more specifically, a conductive ink composition is provided that includes composite metal nanoparticles including first metal nanoparticles and second metal nanoparticles, and a polymer matrix. The polymer matrix is a composition including a polymer and a solvent, the first metal nanoparticles and the second metal nanoparticles are different metals, and the content of the composite metal nanoparticles is about 20 to about 25 wt %, the content of the polymer is about 5 to about 10 wt %, and the content of the solvent is about 65 to about 75 wt %, based on the total weight of the composition.

Abstract: Disclosed are amorphous carbon nanofibers including copper nanoparticles or copper alloy nanoparticles, copper composite nanoparticles prepared by grinding the amorphous carbon nanofibers and implemented as surfaces of Cu-included particles are partially or wholly coated with amorphous carbons, a dispersed solution including the copper composite nanoparticles, and preparation methods thereof and the amorphous carbon nanofibers include nanoparticles including copper, copper nanoparticles or copper alloy nanoparticles, and, the copper composite nanoparticles are implemented as surfaces of Cu-included particles are partially or wholly coated with amorphous carbons.

Abstract: The present invention relates to a mode-locker including a graphene and a laser pulse device. The mode-locker mode-locks a laser that propagates through a laser oscillation loop. The mode-locker includes: i) a core; ii) cladding that surrounds the core, wherein a groove is formed on a side of the cladding; and iii) a graphene layer that is located in the groove and is formed to be extended along a direction to be parallel to a transferring direction of the laser such that a laser pulse is formed by the interaction of the graphene and the field of the propagating laser mode.

Abstract: Disclosed are a composite electrode active material and a supercapacitor using the same, and more particularly, an electrode active material having M1-xRuxO3 (M=Sr, Ba, Mg) and a supercapacitor using the same, wherein the electrode active material is characterized by comprising M1-xRuxO3, where M is at least one selected from a group consisting of strontium, barium and magnesium, and a method for fabricating a composite electrode active material comprises (a) preparing a spinning solution containing a precursor of M oxide, a precursor of Ru oxide, a polymer and a solvent, (b) spinning the spinning solution on a collector to fabricate a nanofiber web having M1-xRuxO3 precursor, and (c) performing heat treatment for the nanofiber web to remove the polymer so as to make an electrode active material in the structure of porous nanofiber web having M1-xRuxO3, wherein the M comprises at least one selected from a group consisting of strontium, barium and magnesium.

Abstract: The present invention relates to a mode-locker including a graphene and a laser pulse device. The mode-locker mode-locks a laser that propagates through a laser oscillation loop. The mode-locker includes: i) a core; ii) cladding that surrounds the core, wherein a groove is formed on a side of the cladding; and iii) a graphene layer that is located in the groove and is formed to be extended along a direction to be parallel to a transferring direction of the laser such that a laser pulse is formed by the interaction of the graphene and the field of the propagating laser mode.

Abstract: The present invention provides an apparatus and method for detecting components of a mixed gas which increases the detection efficiency using a sensor array in which various types of nanomaterials such as carbon nanotubes (CNT), zinc oxide (ZnO), titanium dioxide (TiO2), and tin dioxide (SnO2) which are sensitive to environment, so as to detect various components of a mixed gas using the characteristics that the effective refractive index change of the sensors induced by the gas adsorption depends on the apecies of nanomaterials and a concentration change in detected materials, thus effectively detecting the components of a mixed gas by the single detection without an inefficient education process required for conventional pattern recognition.

Abstract: A biomaterial producing method and a biomaterial produced by the same are disclosed. The method includes preparing an electrolyte by dissolving monobasic potassium phosphate (KH2PO4) and calcium chloride (CaCl2) in distilled water placed in an electrolytic bath, adjusting a concentration of calcium chloride (CaCl2) in the electrolyte, immersing titanium (Ti) as an anode and stainless steel as a cathode into the electrolyte, generating plasma by applying current and voltage to the anode and the cathode to generate arc-discharge in the titanium, and coating a surface of the titanium with a hydroxyapatite (Ca10(PO4)6(OH)2) layer through micro-arc oxidation using the plasma. The hydroxyapatite layer can be thickly formed at low cost and has improved crystallinity.

Abstract: Techniques, devices, and systems for generating tunable dispersions to control or compensate for dispersions in optical signals by using wave-guiding grating elements with nonlinear group delays.

Abstract: Techniques for compensating for PMD in multiple WDM channels by processing all WDM channels in the same manner without demultpliexing the channels. A feedback control is provided to decrease the worst-case power penalty and the channel fading probability by optimizing over the entire group of WDM channels.