Abstract: Provided are a silicon nitride film etching composition, a method of etching a silicon nitride film using the same, and a manufacturing method of a semiconductor device. Specifically, a silicon nitride film may be stably etched with a high selection ratio relative to a silicon oxide film, and when the composition is applied to an etching process at a high temperature and a semiconductor manufacturing process, not only no precipitate occurs but also anomalous growth in which the thickness of the silicon oxide film is rather increased does not occur, thereby minimizing defects and reliability reduction.

Abstract: A semiconductor package comprises a base substrate, a first semiconductor chip on the base substrate, a first dam structure which overlaps a corner of the first semiconductor chip from a plan view and is placed on the base substrate and a first fillet layer which is placed vertically between the base substrate and the first semiconductor chip, and vertically between the first dam structure and the first semiconductor chip.

Abstract: Provided is a cordless hair dryer. The cordless hair dryer includes a housing including a body part gripped by a user and a head part having a blower tube therein, a battery disposed inside the body part, a blower fan disposed in one end of the head part, a support which is inserted into the other end of the head part and fixed to an inner side of the blower tube, and a planar heating element which is formed as a carbon nanotube sheet and disposed on the support to receive power from the battery.

Abstract: Disclosed is a method for preparing a metal-carbon composite. The method includes synthesizing a planarized ligand compound via planarization-modification of a polyphenol-based ligand compound; synthesizing a metal-organic composite via hydrothermal synthesis of a mixed solution of the planarized ligand compound and metal ions; drying the metal-organic composite to prepare precursor powders; and carbonizing the precursor powders.

Abstract: Provided is a cordless hair dryer. The cordless hair dryer includes a housing including a body part gripped by a user and a head part having a blower tube therein, a battery disposed inside the body part, a blower fan disposed in one end of the head part, a support which is inserted into the other end of the head part and fixed to an inner side of the blower tube, and a planar heating element which is formed as a carbon nanotube sheet and disposed on the support to receive power from the battery.

Abstract: A high-efficiency cordless hair dryer according to an exemplary embodiment of the present invention may include: a main body housing having, at a rear side thereof, an air inlet port through which air is introduced, having, at a front side thereof, a discharge port through which the air is discharged, and having an internal space in which a heating element is mounted; and a power supply module configured to supply power and detachably coupled to the rear side of the main body housing at which the air inlet port is formed, in which the power supply module is detachably coupled to the main body housing so as to be coincident with a direction of a flow of air in the main body housing.

Abstract: A carbon nanotube assembly manufacturing apparatus includes a synthesis furnace having a carbon nanotube synthesis space inside, and a gas supply unit that is disposed at a lower portion of the synthesis furnace and ejects an inert gas through a plurality of nozzles to converge carbon nanotubes discharged from the synthesis furnace. The plurality of nozzles are arranged along an arc of the gas supply unit so as to surround the carbon nanotubes discharged from the synthesis furnace and are individually adjustable.

Abstract: A carbon nanotube assembly manufacturing apparatus includes a synthesis furnace having a carbon nanotube synthesis space inside, and a gas supply unit that is disposed at a lower portion of the synthesis furnace and ejects an inert gas through a plurality of nozzles to converge carbon nanotubes discharged from the synthesis furnace. The plurality of nozzles are arranged along an arc of the gas supply unit so as to surround the carbon nanotubes discharged from the synthesis furnace and are individually adjustable.