Abstract:
The present invention relates to fullerene carbon nanotubes having a cylindrical wall comprising a double layer of carbon atoms and methods for the production and application of these double-wall carbon nanotubes; and, more particularly, to nanotubes with controlled number of carbon layers and methods for the production of macroscopic amounts of these nanotubes and there application as cathode materials in the cold field electron emission devices, notable such devices comprising light emitting CRT's.
Abstract:
A purification method for a carbon material containing carbon nanotubes is provided, which satisfies the following requirements: The method should prevent carbon nanotubes from being damaged, broken or flocculated; the method should be capable of removing the catalyst metal and carbon components other than the carbon nanotubes; and the method should be applicable to not only multi-walled carbon nanotubes but also single-walled carbon nanotubes which will undergo significant structural changes when heated to 1400°C or higher temperatures. The method is characterized by including a carbon material preparation process for preparing a carbon material containing carbon nanotubes by an arc discharge method, using an anode made of a material containing at least carbon and a catalyst metal; and a halogen treatment process for bringing the carbon material into contact with a gas containing a halogen and/or halogen compound.
Abstract:
A field emission source for electrons as a field emission cathode is described. The field emission cathode is an ensemble of stochastically distributed field emission structures/peaks of freestanding nanowires or nanowire bundles formed thereof made of electrochemically precipitable metal materials. The field emission structures of the field emission cathode are dense at 103 to 109 cm-2. The individual emission structure is located at an average distance of 0.1 to 50 μm from the adjacent emission structures, the diameter d of the nanowires is in the range of 10 nm to 10 μm, and the height h of the nanowires is in the range of 1 to 100 μ. The field emission cathode emits via at least one emission peak of the ensemble of field emission structures. If one of the field emission structures fails, another field emission structure assumes the emission, or the other field emission structures assume the emission, providing useful redundancy. The two-dimensional, homogeneous emission via a central region of the emission cathode is adjustable.
Abstract:
Provided is a method of manufacturing a carbon nano-tube (CNT) for a field emission device (FED) into which a nano-sized metal particle is added to thereby highly increase reliability of an electron emission source ("emitter"). The method of manufacturing a CNT emitter includes the steps of: (a) dispersing a CNT powder, an organic binder, a photosensitive material, a monomer, and a nano-sized metal particle in a solvent to thereby manufacture a CNT paste; (b) coating the CNT paste onto an electrode formed over a substrate; (c) exposing the CNT paste coated on the electrode to thereby perform fine-patterning; (d) plasticizing the finely patterned CNT paste; and (e) processing a surface of the CNT paste such that the surface of the plasticized CNT paste is activated. According to the above configuration, the CNT emitter can be finely patterned to several µm. Also, since a plurality of CNT emitter regions may be formed within a single pixel, uniformity of the electron emission can be improved. In addition, the nano-sized metal particle is added as a metal filler of the CNT paste, so that the metal can be melted at a low temperature where the CNT does not deteriorate. Furthermore, adhesion to a cathode electrode of the CNT is enhanced, so that the reliability of the CNT emitter can be improved.
Abstract:
A method of batch fabrication using established photolithographic techniques allowing nanoparticles or nanodevices to be fabricated and mounted into a macroscopic device in a repeatable, reliable manner suitable for large-scale mass production. Nanoparticles can be grown on macroscopic "modules" which can be easily manipulated and shaped to fit standard mounts in various devices.
Abstract:
Provided are an electron emission source, a display apparatus using the same, an electronic device, and a method of manufacturing the display apparatus. The electron emission source includes a substrate, a cathode separately manufactured from the substrate, and a needle-shaped electron emission material layer, e.g., carbon nanotube (CNT) layer, fixed to the cathode by an adhesive layer. The CNT layer is formed by a suspension filtering method, and electron emission density is increased by a subsequent taping process on the electron emission material layer.
Abstract:
A resistive spacer coating for a carbon nanotube (CNT)/ field emission device (FED) display is described. The resistive spacer coating reduces electrostatic charging of the spacer during operation of the display while maintaining the field potential between the cathode and the phosphor screen. The resistive coating includes one or more resistive materials which are combined with binders that are then applied to the spacer.
Abstract:
The present invention relates to a method for manufacturing a field emitter electrode, in which nanowires are aligned horizontally, perpendicularly or at any angle between horizontal and perpendicular according to the direction of a generated electromagnetic field. More particularly, the present invention relates to a method for manufacturing a field emitter electrode having nanowires aligned horizontally, perpendicularly or at any angle between horizontal and perpendicular according to the direction of a generated electromagnetic field, the method comprising the steps of diluting nanowires in a solvent, dispersing the resulting solution on a substrate fixed to the upper part of an electromagnetic field generator, and fixing the nanowires aligned in the direction of an electromagnetic field generated from the electromagnetic field generator. According to the present invention, a high capacity field emitter electrode having high density nanowires aligned according to the direction of a generated electromagnetic field can be fabricated by a simple process and nanowires can be used as positive electrode materials for field emission displays (FEDs), sensors, electrodes, backlights and the like.
Abstract:
The invention provides an electron source suitable for use in a charged-particle apparatus, in which source a beam of electrons can be extracted from an electrode that is subjected to at least one of an electric potential, thermal excitation and photonic excitation, whereby at least part of the electrode comprises semiconductor material having a conduction band that is quantized into discrete energy levels. Such a source enjoys a relatively low energy spread, typically much smaller than that of a Cold Field Emission Gun (CFEG). Said semiconductor material may, for example, comprise a semiconductor nanowire. Examples of suitable semiconductor materials for such a nanowire include InAs and GaInAs.