Abstract: A micro-separator for gas chromatography includes a base substrate having a trench defining a micro-column, and a three-dimensional (3D) porous ceramic-polymer composite disposed in the micro-column and having pores that three-dimensionally connected to each other with periodicity. The 3D porous ceramic-polymer composite includes a ceramic nano-structure, which forms an array of three-dimensionally arranged nano-shells, and a reaction-activating layer combined on a surface of the ceramic nano-structure and including a polymeric reaction-activating material. A thickness of the 3D porous ceramic-polymer composite is 10 ?m to 20 ?m, a column length of the 3D porous ceramic-polymer composite is 30 cm to 70 cm, and a shell thickness of the ceramic nano-structure is 20 nm to 60 nm. The micro-separator may have improved separation performance and durability.

Abstract: A 3D memristor element includes a 3D nano-composite including a resistance-varying part, a first conductor and a second conductor, a first terminal electrically connected to the first conductor, and a second terminal electrically connected to the second conductor. The resistance-varying part includes a plurality of nano-shells, which are three-dimensionally arranged and connected to each other. The first conductor is disposed in the nano-shells and has a 3D network structure thereby forming a 3D interface with the nano-shells. The second conductor three-dimensionally surrounds the resistance-varying part, and is separated from the first conductor by the resistance-varying part.

Abstract: A gas sensor includes a first electrode disposed on a substrate, a second electrode disposed on the substrate and spaced apart from the first electrode, and a sensitive member disposed on the substrate. The sensitive member contacts first and second electrodes and has a porous structure from a three-dimensional (3D) arrangement of shells including a gas-sensitive material. A thickness of the sensitive member is 5 ?m to 10 ?m, and a thickness of the shells is 10 nm to 40 nm.

Abstract: A method for fabricating a nano-structure includes: providing a phase mask having an uneven lattice structure to contact a photoresist film; exposing the photoresist film to a light through the phase mask such that the light is obliquely incident on a surface of the photoresist film; and developing the photoresist film to form a nano-structure.

Abstract: A disclosed micro pre-concentrator includes a base substrate having a trench, and a 3D nano-shell composite disposed in the trench and having pores that are ordered and connected to each other. The 3D nano-shell composite includes a 3D nano-shell support defined by a thin film extending three-dimensionally and a polymeric layer formed along a surface of the 3D nano-shell support. The micro pre-concentrator may increase adsorption amount of gas. In addition, since it may be uniformly heated in a short time, it is possible to release gas at a high density in a short time.

Abstract: A transparency-adjusting apparatus includes a transparency-adjustable film including a polymer and an array of pores that are three-dimensionally ordered and connected to each other, and a compressive-strain adjusting part that adjusts a compressive strain of the transparency-adjustable film in a vertical direction. A transparency of the transparency-adjustable film varies depending on the compressive strain. The pores are arranged to tilt from the vertical direction.

Abstract: An ordered porous nano-network electrode includes a conductive three-dimensional structure having ordered and interconnected pores, and an active layer disposed on a surface of the conductive three-dimensional structure to surround the pores and including an organic active material having a redox center. An amount of the organic active material in a unit area is 0.1 mg/cm2 to 30 mg/cm2.

Abstract: According to an embodiment, a porous electrode comprises a three-dimensional nanostructured porous catalyst film including a catalyst material promoting an oxygen reduction and evolution reactions, having an aligned pore structure, and having an upper surface and a lower surface opening the pore structure and a porous current collecting layer interfacially adhered to the three-dimensional nanostructured porous catalyst film by a binder polymer.

Abstract: A disclosed micro-separator for gas chromatography includes a base substrate having a trench, a channel column disposed in the trench, and a cover member combined with the base substrate and covering the channel column. The channel column includes a stationary phase having pores ordered and three-dimensionally connected to each other.

Abstract: A gas sensor includes a first electrode disposed on a substrate, a second electrode disposed on the substrate and spaced apart from the first electrode, and a sensitive member disposed on the substrate. The sensitive member contacts first and second electrodes and has a porous structure from a three-dimensional (3D) arrangement of shells including a gas-sensitive material. A thickness of the sensitive member is 5 ?m to 10 ?m, and a thickness of the shells is 10 nm to 40 nm.

Abstract: A three-dimensional porous composite electrode includes a three-dimensional porous current-collector and an active material layer including an active material and having a three-dimensional structure along a surface of the three-dimensional porous current-collector. The three-dimensional porous current-collector extends along a first direction, includes a current-collecting material and has a porosity gradient along a second direction perpendicular to the first direction. The three-dimensional porous composite electrode has a ratio gradient of the active material to the current-collecting material along the second direction.

Abstract: The disclosed graphene quantum dot composite includes a dielectric matrix including a metal oxynitride, and a graphene quantum dot dispersed in the dielectric matrix. The graphene quantum dot composite can reduce the aggregation-caused photoluminescence quenching of graphene quantum dots, and can improve a photoluminescence quantum yields of a graphene quantum dot.

Abstract: A stretchable transparency-adjusting film includes an inner elastic part having a three-dimensional network shape and including a first elastomer, an inorganic thin film surrounding the inner elastic part, and an outer elastic part surrounding the inorganic thin film and including a second elastomer. A scattering unit defined by the inner elastic part, the inorganic thin film and the outer elastic part in a cross-section is orientated in an inclined direction to a vertical direction and a horizontal direction.

Abstract: The disclosed pre-concentrator comprises: a base substrate having a trench; a metal layer conformally disposed along the inner surface of the trench; and a three-dimensional porous nanostructure disposed on the metal layer in the trench and having aligned pores connected to each other in three dimensions. The pre-concentrator can improve the concentration performance of a sample and the thermal desorption efficiency of a concentrated sample.

Abstract: A method for fabricating a nano-structure includes: providing a phase mask having an uneven lattice structure to contact a photoresist film; exposing the photoresist film to a light through the phase mask such that the light is obliquely incident on a surface of the photoresist film; and developing the photoresist film to form a nano-structure.

Abstract: The present invention relates to the method for manufacturing high quality graphene by heating carbon-based self-assembly monolayers, comprising the steps of: forming carbon source layers which are convertible into the graphene layer on the substrate; forming a metal catalyst layer on the carbon source layer; converting the carbon source layers into the graphene layer by heating the first part of the substrate using a local heating source, wherein the carbon source layers and the metal catalyst layers are formed; converting the carbon source layers into graphene by moving the local heating source and then heating the second part which is different from the first part; and removing the metal catalyst layer. The present invention also provides a substrate comprising a graphene layer manufactured by the above method and provides applications in semiconductor devices and electronic materials using the substrate.

Abstract: A simple and easy method for fabricating graphene quantum dots with uniformed size and high quality of emission property comprises steps of, mixing graphite powders with metallic hydrate salts, forming an intercalation compound of graphite wherein metal ions are inserted by heating the mixed solution, and removing the metal ions from the intercalation compound of graphite. The graphene quantum dots is applicable to the development of electronic products in next generation such as display devices, recording devices, various sensors and nanocomputers and is applicable to biological and medicinal field as well.

Abstract: A simple and easy method for fabricating graphene quantum dots with uniformed size and high quality of emission property comprises steps of, mixing graphite powders with metallic hydrate salts, forming an intercalation compound of graphite wherein metal ions are inserted by heating the mixed solution, and removing the metal ions from the intercalation compound of graphite. The graphene quantum dots is applicable to the development of electronic products in next generation such as display devices, recording devices, various sensors and nanocomputers and is applicable to biological and medicinal field as well.

Abstract: The present invention relates to the method for manufacturing high quality graphene by heating carbon-based self-assembly monolayers, comprising the steps of: forming carbon source layers which are convertible into the graphene layer on the substrate; forming a metal catalyst layer on the carbon source layer; converting the carbon source layers into the graphene layer by heating the first part of the substrate using a local heating source, wherein the carbon source layers and the metal catalyst layers are formed; converting the carbon source layers into graphene by moving the local heating source and then heating the second part which is different from the first part; and removing the metal catalyst layer. The present invention also provides a substrate comprising a graphene layer manufactured by the above method and provides applications in semiconductor devices and electronic materials using the substrate.

Abstract: The present invention is 3D nanostructured porous metal oxide and the method of fabricating said metal oxide, wherein said method is comprising the steps of: (a) spin-coating with photoresist onto substrate; (b) forming periodic 3D porous nanostructure patterned pore in said photoresist using proximity-field nanopatterning; (c) impregnating metal oxide into said 3D pore of photoresist having said periodic 3D pore pattern as template via atomic layered deposition (ALD) with metal precursor; and (d) obtaining 3D nanostructured porous metal oxide having the inverse shape of said template by removing said photoresist template.