Abstract:
Carbon nanotube material having an outer diameter less than 10 nm and a number of walls less than ten are disclosed. Also disclosed are an electron field emission device including a substrate, an optionally layer of adhesion-promoting layer, and a layer of electron field emission material. The electron field emission material includes a carbon nanotube having a number of concentric graphene shells per tube of from two to ten, an outer diameter from 2 to 8 nm, and a nanotube length greater than 0.1 microns. One method to fabricate carbon nanotubes includes the steps of (a) producing a catalyst containing Fe and Mo supported on MgO powder, (b) using a mixture of hydrogen and carbon containing gas as precursors, and (c) heating the catalyst to a temperature above 950 °C to produce a carbon nanotube. Another method of fabricating an electron field emission cathode includes the steps of (a) synthesizing electron field emission materials containing carbon nanotubes with a number of concentric graphene shells per tube from two to ten, an outer diameter of from 2 to 8 nm, and a length greater than 0.1 microns; (b) dispersing the electron field emission material in a suitable solvent; (c) depositing the electron field emission materials onto a substrate; and (d) annealing the substrate.
Abstract:
A diamond field emission tip and methods of forming such diamond field emission tips, for use with cathodes that will act as a source of and emit beams of charged particles.
Abstract:
An electron emission element (2) includes an electron emission unit (6) made of diamond. When an electron emission current value is equal to or above 10 µA in the electron emission element (2), a deviation of the electron emission current value for one hour is within ± 20%. Moreover, the number of generations of a stepwise noise in which the electron emission current value changes stepwise is once or below per 10 minutes.
Title translation:SHARP END FORMING MEMBER,SHARP END FORMING MEMBER,APPARATUS WHEREIN SUCH SHARP END FORMING MEMBER IS APPLIED AND METHOD FOR FORMING SHARP END FORMUS MEMBER
Abstract:
Provided is a sharpening method by which an end can be sharpened more than an end sharpened by the conventional machining and polishing. A sharpened sharp end forming member and an apparatus wherein such sharp end forming member is applied are also provided. A sharp end region (2) is formed on a conductive member (1) or a conductive film forming member, an insulating film (6) is formed to cover the surface of a sharp end of the sharp end region (2), and a counter electrode (7) is arranged to face the sharp end. An electric field of a magnitude that permits a dark current to flow without generating discharge is applied between the sharp end and the counter electrode (7) to melt the sharp end once, and a pyramid-shaped single-crystallized or recrystallized sharpest end section (8) is grown.
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:
[PROBLEMS] To provide a carbon nanotube of novel structure. [MEANS FOR SOLVING PROBLEMS] A buffer layer composed of TiN is formed on an Si substrate. Co nano particles having a particle size of 5 nm or less are deposited on the buffer layer by generating a pulse arc about 3-150 times by using a pulse arc plasma under a vacuum of 1×10 -5 Torr. When a carbon nanotube is grown subsequently, a pyramidal punctate aggregate of carbon nanotubes having a mean outside diameter of 4 nm and a mean inside diameter of 3 nm is formed. The aggregate exhibits high field electron emission efficiency.