Abstract:
Disclosed in the present invention is a method for fabricating a triode-type field emitter, the method comprising the steps of: growing carbon nanotubes on a substrate using semiconductor-processing technology; coating an insulating material, particularly SOG (Spin-On-Glass), on the substrate having the carbon nanotubes grown thereon; drying the coated insulating material; and cutting the coated insulating material with a grinder to uniform height so as to control the height of the carbon nanotubes. According to the present invention, the following advantages are obtained: (1) the insulation between the carbon nanotubes and the substrate can be achieved so as to prevent leakage current, (2) the damage of the carbon nanotubes in the polishing step, (3) the adhesion between the carbon nanotubes and the substrate is maintained, (4) the field emission stability of the field emitter is improved. Furthermore, according to the present invention, the growth length of the carbon nanotubes is easily controlled so that the field emission properties of the carbon nanotubes become uniform and an advantage in terms of process convenience is obtained.
Abstract:
The invention relates generally to dispersing and fractionating single-wall carbon nanotubes, which can be derivatized to facilitate fractionation, for example, by adding solubilizing moieties to the nanotubes.
Abstract:
A preferred method for making a carbon nanotube-based field emission cathode device in accordance with the invention includes the following steps: preparing a solution having a solvent and a predetermined quantity of carbon nanotubes dispersed therein; providing a base with an electrode (101) formed thereon; forming a layer of conductive grease (102) on the base; distributing the solution on the layer of conductive grease to form a carbon nanotube layer (103) on the conductive grease; and scoring the layer of conductive grease, for separating first ends of at least some of the carbon nanotubes from the conductive grease for attaining effective carbon nanotube field emission cathode.
Abstract:
In a main display area of a second correction screen on a monitor, a floating window is displayed together with a target image to correct, at a position designated by placing a reference point on an appropriate point on the target image. The floating window is split into a plural number of partial display sections, wherein those portions of the target image which have similar colors to a color of the reference point are displayed as target components of color correction, in such conditions as corrected based on different color correction parameter values from one another between the partial display sections. When one of the partial display sections is selected, all of those portions of the target image which correspond to the target components are displayed in the same color-corrected conditions as those displayed in the selected partial display section.
Abstract:
An electron emitter includes a coating layer of a mixture of carbon nanotubes and alkaline-earth metal oxides on an electrically conducting structure. The preferred carbon nanotubes are those having a diameter less than about 200 nm. A substantial portion of electron emission is liberated from the carbon nanotubes, thus lessening the requirement on the alkaline-earth oxides. Such an electron emitter is advantageously used in gas discharge devices to increase the energy efficiency thereof.
Abstract:
Carbon nanotubes, which may or may not be mixed with particles, organic materials, non-organic materials, or solvents, are deposited on a substrate to form a cold cathode. The deposition of the carbon nanotube mixture may be performed using an ink jet printing process or a screen printing process.
Abstract:
Field emission properties may also be improved by coating the carbon materials with metal oxides. These metal oxides contribute to lowering the work function of the carbon material as well as improve the life of the field emission properties of the carbon materials, especially under high current density operation.
Abstract:
An apparatus for producing an electron beam, comprising a support structure; a miniature ultrahigh vacuum chamber comprising a superconducting single walled metallic-type carbon nanotube comprised of a cylindrical wall, a proximal end disposed upon and sealed to the support structure, and a distal end comprising an electron-transparent structure; an electron beam emitting tip comprising a second carbon nanotube embedded in the support structure and disposed within the superconducting single walled metallic-type carbon nanotube, the second carbon nanotube having an inner surface with a thin conductive coating disposed thereupon; and means for creating an electrical potential difference the electron beam emitting tip and the cylindrical wall of said superconducting carbon nanotube. There is also provided a scanning electron microscope comprising an enclosed point source electron beam generator disposed within a conically tapered enclosure having a proximal end and a distal end, the proximal end in communication through an opening therein with a vacuum tube, and the distal end comprising a conical pipette tip target opening.
Abstract:
This invention relates generally to forming arrays of single-wall carbon nanotubes (SWNT) and compositions thereof. In one embodiment, the present invention involves forming an array from more than one separately prepared molecular arrays or templates to prepare a composite structure. The multiple arrays can be the same or different with respect to the SWNT type or geometric arrangement in the array.
Abstract:
An alignment unit and an alignment method for aligning needle-like structures. The alignment unit includes a substrate having a surface and grooves defined in the surface. The grooves are sized and arranged such that when the needle-like structures are received therein, the needle-like structures are aligned.