Abstract: An ultraviolet emitting device according to the present disclosure includes a lamp for mounting a discharge gas and an ultraviolet emission source therein, and a plurality of yarns formed by extending and aggregating carbon nanotubes in a first direction, and includes a first electrode at least partially exposed to the discharge gas within the lamp. Accordingly, electron emission efficiency of the first electrode is improved to achieve high efficiency, and durability is also improved to provide a long-life device.

Abstract: The present invention provides an emitter, which comprises carbon nanotubes and is excellent in the efficiency of electron emission, and an X-ray tube comprising the same.

Abstract: This application relates to an electrostatic precipitator with an electromagnetic wave tube comprising a carbon nanotube (CNT)-based emitter. The electrostatic precipitator includes a charger configured to include the CNT-based emitter and ionize microparticles, in contaminated air introduced from the environment, by emitting an electromagnetic wave. The electrostatic precipitator further includes a collector configured to collect the ionized microparticles to discharge clean air.

Abstract: Disclosed is an electromagnetic wave generator, comprising a tube comprising an anode, a cathode and at least one gate, a tube power supply circuit in which one side of an output terminal is connected to the anode, and the other side of the output terminal is connected to the cathode, and a gate controlling circuit in which at least one side of the output terminal is connected to the gate, wherein a first voltage value of one side of the output terminal of the tube power supply circuit and a second voltage value of the other side of the output terminal of the tube power supply circuit are different from each other with respect to a ground terminal of the tube power supply circuit.

Abstract: The present invention provides an emitter, which comprises carbon nanotubes and is excellent in the efficiency of electron emission, and an X-ray tube comprising the same.

Abstract: The present invention provides an emitter, which comprises carbon nanotubes and is excellent in the efficiency of electron emission, and an X-ray tube comprising the same.

Abstract: The present invention provides a process for preparing a carbon nanotube sheet, which comprises forming carbon nanotubes; aggregating the carbon nanotubes to form a yarn; treating the yarn with a solvent to enhance the aggregation force; winding the solvent-treated yarn to prepare a sheet preform having a structure in which one yarn is continuously wound; and cutting and/or pressing the sheet preform to prepare a carbon nanotube sheet that comprises an arrangement structure in which one or a plurality of yarns are uniaxially aligned, and a carbon nanotube sheet prepared thereby.

Abstract: The present invention provides an emitter, which comprises carbon nanotubes and is excellent in the efficiency of electron emission, and an X-ray tube comprising the same.

Abstract: The present invention provides a process for preparing a yarn, which comprises introducing a raw material that comprises a carbon source and a catalyst into a reaction chamber having a heating means, converting the carbon source into a plurality of carbon nanotubes in a heating part of the reaction chamber with thermal energy supplied by the heating means, and growing the plurality of carbon nanotubes in the vertical direction to form a yarn by the interactions among the carbon nanotubes.

Abstract: Provided is a field emission apparatus including a pipe-shaped emitter holder comprising an electrically conductive material and a first internal space communicated in a first direction, and an emitter electrode having one or more yarns each having a structure extending in the first direction in which a plurality of CNTs that extend in the first direction are aggregated, and the emitter electrode is inserted in the first internal space while extending in the first direction.