摘要:
A method for manufacturing carbon nanotubes of the present invention includes the steps of: preparing at least one metal selected from a group consisting of iron, cobalt and nickel and an organic compound: and forming carbon nanotubes by using the organic compound as a carbon source, wherein the metal and the organic compound are put into a heating vessel having a substance capable of converting electromagnetic energy into heat, and the organic compound is brought into contact with the metal in a state where the inside of the heating vessel is heated at a temperature of 600° C. to 900° C. by applying the electromagnetic energy to the heating vessel so as to form the carbon nanotubes.
摘要:
A method for manufacturing carbon nanotubes includes the steps of: preparing metal-containing-nanofibers which include nanofibers made of organic polymer and metal which possesses a catalytic function in forming carbon nanotubes; and forming carbon nanotubes which contain metal therein by using the nanofibers as a carbon source, wherein the carbon nanotubes are formed by putting the metal-containing-nanofibers into a heating vessel which has a substance capable of converting electromagnetic energy into heat, and by heating the metal-containing-nanofibers using heat which is generated by the heating vessel when electromagnetic energy is applied to the heating vessel.
摘要:
A method for manufacturing carbon nanotubes of the present invention includes the steps of: preparing a metal complex which contains at least one metal selected from a group consisting of iron, cobalt and nickel and an organic compound: and forming carbon nanotubes which contain metal therein by using the organic compound as a carbon source, wherein the carbon nanotubes are formed by putting the metal complex into a heating vessel which has a substance capable of converting electromagnetic energy into heat, and by heating the metal complex using heat which is generated by the heating vessel when electromagnetic energy is applied to the heating vessel. As the metal complex used in a method for manufacturing carbon nanotubes of the present invention, nickel stearate or nickel benzoate can be named, for example. According to the method for manufacturing carbon nanotubes of the present invention, it is possible to manufacture carbon nanotubes using an inexpensive heating device within a short time.
摘要:
A method of manufacturing a data storage device may include forming a magnetic tunnel junction layer on a substrate, irradiating a first ion beam on the magnetic tunnel junction layer to form magnetic tunnel junction patterns separated from each other, irradiating a second ion beam on the magnetic tunnel junction layer, and irradiating a third ion beam on the magnetic tunnel junction layer. The first ion beam may be irradiated at a first incident angle. The second ion beam may be irradiated at a second incident angle that may be smaller than the first incident angle. The third ion beam may be irradiated to form sidewall insulating patterns on sidewalls of the magnetic tunnel junction patterns based on re-depositing materials separated by the third ion beam on the sidewalls of the magnetic tunnel junction patterns.
摘要:
A method of fabricating a semiconductor device includes forming conductive pillars on a substrate, sequentially forming a sacrificial layer and a molding structure between the conductive pillars, forming a conductive layer on the molding structure, such that the conductive layer is connected to the conductive pillars, removing the sacrificial layer to form an air gap, removing the molding structure to form an expanded air gap, and patterning the conductive layer to open the expanded air gap.
摘要:
The inventive optical component assembly advantageously enables a multi-waveguide optical component (such as the inventive optical fiber coupler array, a multi-core optical fiber, etc.), to be coupled to at least one waveguide of an optical device at a predefined coupling angle. The optical component assembly of the present invention comprises a multi-waveguide optical component with an output end, a prism having an input surface, an output surface, and an internal reflective surface with a predefined reflection angle, and a GRIN lens, positioned between the component output end and the prism input surface, along a longitudinal axis of the multi-waveguide optical component. In accordance with the present invention, the length of the GRIN lens, and its refractive index gradient profile are optimized to form an optical image of the output end of the multi-waveguide optical component, at the output surface of the prism, thus enabling the output surface of the prism to be coupled to at least one waveguide of an optical device, with the predefined reflection angle corresponding to the angle at which the multi-waveguide optical component may be coupled to the optical device.
摘要:
A semiconductor device including vertical field effect transistors may comprise a buried insulating film stacked on a semiconductor substrate and spaced apart first and second active regions vertically penetrating the buried insulating film. The active regions and the buried insulating film are covered with an interlayer insulating film. An upper interconnection is disposed in the interlayer insulating film. A gate electrode extends from a part of the upper interconnection into the buried insulating film between the first and second active regions. A protective film pattern is disposed to cover a top surface of the upper interconnection. First and second buried contact electrodes penetrating the interlayer insulating film to be in contact with top surfaces of the first and second active regions are provided. Related manufacturing methods are also described.
摘要:
A magnetic memory device may include a lower electrode on a substrate, a memory element on the lower electrode, an upper electrode on the memory element, and a protection spacer enclosing a portion of a side surface of the lower electrode and protruding laterally from the side surface of the lower electrode. The protection spacer may have a bottom surface that is positioned at a level higher than that of a bottom surface of the lower electrode.
摘要:
The inventive concepts disclosed herein include, for instance, methods for etching a metal layer and methods for manufacturing a semiconductor device using the etched metal layer. A wafer including a metal layer and a mask layer on the metal layer may be loaded into a process chamber. An etching gas may be supplied into the process chamber to etch the metal layer exposed by the mask layer. After the etching process, the mask layer may be removed. The etching gas can include phosphorus (P) and fluorine (F). An RF power may be constantly or selectively supplied to the process chamber, or different levels of RF power can be selectively supplied. An etching gas can be supplied to the process chamber when the RF power is off or at a lower level. A surface activation gas can be supplied when the RF power is on or at a higher level.
摘要:
An ion beam etching device comprises: an ion source configured to generate ions; a grid on a side of the ion source, the grid configured to accelerate the generated ions to generate an ion beam; a process chamber configured to have an etching process using the ion beam performed therein; and a variable magnetic field application part adjacent to the process chamber, the variable magnetic field application part configured to apply a variable magnetic field.