Abstract: An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system; and a spacer disposed between the sixth and seventh lenses, wherein the optical imaging system satisfies 0.5<S6d/f<1.4, where S6d is an inner diameter of the spacer, f is an overall focal length of the optical imaging system, and S6d and f are expressed in a same unit of measurement.

Abstract: An embodiment of the present invention relates to a cylindrical secondary battery in which a positive electrode terminal is adhered and fixed to a cylindrical can by an insulating sheet, and thus sealing between the cylindrical can and the positive electrode terminal can be facilitated due to an increased contact area.

Abstract: The present inventive concept relates to a battery-free gas sensor or humidity sensor comprising a metal-organic framework and a method of manufacturing the same. In a photodiode-type battery-free gas sensor or humidity sensor according to the present inventive concept, since photoelectron collection electrodes are formed at certain intervals between P-N junction layers, when gas is adsorbed thereon, the gas can be detected without an extra power source by change of photocurrent. Due to fine pores of the metal-organic framework, gas sensitivity may be increased and stability of catalysts may be improved. When catalysts are not provided, humidity may be detected. Therefore, a system that used the photodiode-type battery-free gas sensor and the photodiode-type battery-free humidity sensor together may be performed humidity correction to accurately measure an amount of a gas.

Abstract: The present inventive concept relates to a battery-free gas sensor or humidity sensor comprising a metal-organic framework and a method of manufacturing the same. In a photodiode-type battery-free gas sensor or humidity sensor according to the present inventive concept, since photoelectron collection electrodes are formed at certain intervals between P-N junction layers, when gas is adsorbed thereon, the gas can be detected without an extra power source by change of photocurrent. Due to fine pores of the metal-organic framework, gas sensitivity may be increased and stability of catalysts may be improved. When catalysts are not provided, humidity may be detected. Therefore, a system that used the photodiode-type battery-free gas sensor and the photodiode-type battery-free humidity sensor together may be performed humidity correction to accurately measure an amount of a gas.

Abstract: Provided are an electrode including a nanostructure and a method of preparing the same, and more particularly, an electrode including a substrate, and a plurality of metal nanocups or nanorings spaced apart from one another and disposed on the substrate, and openings thereof are aligned above the substrate, and a method of preparing the electrode. An electrode of the present invention includes catalytic metal having a structure of the plurality of nanocups or nanorings and thus, an area, in which a reactant participating in an oxidation or reduction reaction is able to be in contact with catalytic metal, may become wider in comparison to that of a typical electrode having catalytic metal in the shape of a flat thin film. Accordingly, an efficiency of the oxidation or reduction reaction may be improved due to catalytic metal and eventually, a power generation efficiency of a cell may be improved.

Abstract: Disclosed herein are a method of manufacturing large area graphene nanoribbons, which have no residual layer by interposing a chromium layer between a resist layer and a graphene layer, and a sensor including the graphene nanoribbons.

Abstract: Provided are a photoelectrode including a zinc oxide hemisphere, a method of fabricating the same, and a dye-sensitized solar cell using the same. The photoelectrode includes a conductive substrate, a zinc oxide hemisphere disposed on the conductive substrate, and a porous metal oxide layer covering the zinc oxide hemisphere. Light scattering effects of photoelectrodes can be increased, and recombination losses of electrons can be minimized to improve photovoltaic properties.

Abstract: A method of preparing zinc oxide nanostructures using a liquid masking layer is disclosed. The method includes preparing a substrate having a zinc oxide seed layer formed thereon; loading the substrate in a reactor in which a lower liquid masking layer, a precursor liquid layer for hydrothermal growth, and an upper liquid masking layer are disposed in order; and forming zinc oxide nanostructures in a pattern on the substrate through hydrothermal growth by heating the precursor liquid layer for hydrothermal growth.

Abstract: A method of preparing zinc oxide nanostructures using a liquid masking layer is disclosed. The method includes preparing a substrate having a zinc oxide seed layer formed thereon; loading the substrate in a reactor in which a lower liquid masking layer, a precursor liquid layer for hydrothermal growth, and an upper liquid masking layer are disposed in order; and forming zinc oxide nanostructures in a pattern on the substrate through hydrothermal growth by heating the precursor liquid layer for hydrothermal growth.

Abstract: Disclosed herein are a method of manufacturing large area graphene nanoribbons, which have no residual layer by interposing a chromium layer between a resist layer and a graphene layer, and a sensor including the graphene nanoribbons.

Abstract: Provided are an electronic device, a method of manufacturing the same, and a touch panel including the device. The electronic device includes a nanostructure having a plurality of metal oxide nanorods vertically aligned at predetermined intervals in intersection regions between bottom electrodes and top electrodes that perpendicularly cross each other. The nanorods are formed to the same diameter and the same height so that the electronic device can exhibit uniform performance. Also, a method of manufacturing an electronic device includes selectively vertically growing the same number of metal oxide nanostructures with a uniform size only on the bottom electrodes using a nano-template with a plurality of vertical holes. Furthermore, a touch panel includes a nanostructure having a plurality of piezoelectric nanorods disposed in a plurality of touch cells arranged in a matrix.

Abstract: The present invention provides a method of fabricating a vertical type light-emitting diode and a method of separating layers from each other. Crystalline rods are provided on a lower layer or a lower substrate. The crystalline rods comprise ZnO. A layer which constitutes light-emitting diode or a light-emitting diode structure is formed on the crystalline rods, and the lower substrate is separated therefrom. The crystalline rods are dissolved during the separation. The formation of the crystalline rods is achieved by the formation of a seed layer and selective growth based on the seed layer.

Abstract: Disclosed are a nanostructure array substrate, a method for fabricating the same, and a dye-sensitized solar cell by using the same. The nanostructure array substrate includes a plurality of metal oxide nanostructures vertically aligned on the substrate while being separated from each other. The metal oxide nanostructures include nanorods having a ZnO core/TiO2 shell structure or TiO2 nanotubes. The method includes the steps of forming ZnO nanorods vertically aligned from a seed layer formed on a substrate; and coating a TiO2 sol on the ZnO nanorods and sintering the ZnO nanorods to form nanorods having a ZnO core/TiO2 shell structure. The transparency and flexibility of the substrate are ensured. The photoelectric conversion efficiency of the solar cell is improved if the nanostructure array substrate is employed in the photo electrode of the dye-sensitized solar cell.

Abstract: The present disclosure provides a method for manufacturing a graphene nano array. The method includes: preparing a substrate having a graphene sheet disposed thereon; sequentially forming a protective layer, a sacrificial layer and a resist layer on the graphene sheet; forming a hole pattern in a surface of the resist layer; etching the sacrificial layer and the protective layer along the hole pattern to form a trench such that a portion of the protective layer adjacent to the graphene sheet can remain; forming a metal layer of a nanocup pattern along a sidewall of the trench while rotating the trench; removing a lower surface of the metal layer to form a metal layer in a nanotube pattern; removing the resist layer and the sacrificial layer; etching the protective layer and the graphene sheet adjacent to the protective layer along the nanotube pattern; and removing the protective layer and the metal layer, thereby providing a graphene nano array having a large area at low cost.

Abstract: An electrode for a battery and a method for manufacturing the same are disclosed. The electrode for a battery according to the present invention comprising silicon nanostructures integrally formed on a silicon thin film and having a period array can reduce the internal resistance, have better charge transport properties, and reduce the structural stress, thereby exhibiting high storage capacity, high efficiency charge/discharge characteristics, and long charge/discharge cycle characteristics. Moreover, the method for manufacturing the electrode for a battery according to the present invention can simply and easily form a nanopattern with nanostructures on a silicon thin film using laser interference lithography (LIL) and dry etching.

Abstract: The light extraction efficiency of a typical light-emitting diode (LED) is improved by incorporating one-dimensional ZnO nanorods. The light extraction efficiency is improved about 31% due to the waveguide effect of ZnO sub-microrods, compared to an LED without the nanorods. Other shapes of ZnO microrods and nanorods are produced using a simple non-catalytic wet chemical growth method at a low temperature on an indium-tin-oxide (ITO) top contact layer with no seed layer. The crystal morphology of a needle-like or flat top hexagonal structure and the density and size of ZnO microrods and nanorods are easily modified by controlling the pH value and growth time. The waveguide phenomenon in each ZnO rod is observed using confocal scanning electroluminescence microscopy (CSEM) and micro-electroluminescence spectra (MES).

Abstract: Provided are a method of preparing a zinc oxide nanostructure electrode and a method of preparing a dye-sensitized solar cell using the same. According to the present invention, the method of preparing a zinc oxide nanostructure electrode may include sequentially forming a superhydrophobic self-assembled layer and a zinc layer on a carrier substrate having a stamp pattern included therein, disposing the zinc layer on the carrier to face a first substrate and performing a stamp method to form at least one zinc pattern on the first substrate, oxidizing the zinc pattern to form zinc oxide seeds, and growing at least one zinc oxide nanostructure from the zinc oxide seeds by using a hydrothermal synthesis method to form a zinc oxide nanostructure electrode composed of the at least one zinc oxide nanostructure.

Abstract: Provided are an electrode including a nanostructure and a method of preparing the same, and more particularly, an electrode including a substrate, and a plurality of metal nanocups or nanorings spaced apart from one another and disposed on the substrate, and openings thereof are aligned above the substrate, and a method of preparing the electrode. An electrode of the present invention includes catalytic metal having a structure of the plurality of nanocups or nanorings and thus, an area, in which a reactant participating in an oxidation or reduction reaction is able to be in contact with catalytic metal, may become wider in comparison to that of a typical electrode having catalytic metal in the shape of a flat thin film. Accordingly, an efficiency of the oxidation or reduction reaction may be improved due to catalytic metal and eventually, a power generation efficiency of a cell may be improved.

Abstract: The present invention provides a method of fabricating a vertical type light-emitting diode and a method of separating layers from each other. Crystalline rods are provided on a lower layer or a lower substrate. The crystalline rods comprise ZnO. A layer which constitutes light-emitting diode or a light-emitting diode structure is formed on the crystalline rods, and the lower substrate is separated therefrom. The crystalline rods are dissolved during the separation.

Abstract: An electrode for a battery and a method for manufacturing the same are disclosed. The electrode for a battery according to the present invention comprising silicon nanostructures integrally formed on a silicon thin film and having a period array can reduce the internal resistance, have better charge transport properties, and reduce the structural stress, thereby exhibiting high storage capacity, high efficiency charge/discharge characteristics, and long charge/discharge cycle characteristics. Moreover, the method for manufacturing the electrode for a battery according to the present invention can simply and easily form a nanopattern with nanostructures on a silicon thin film using laser interference lithography (LIL) and dry etching.