Carbon nanotube particulate electron emitters
First Claim
1. An electron emitter comprising a carbon nanotube particulate on a surface wherein the carbon nanotube particulate comprises entangled small-diameter carbon nanotubes wherein the small-diameter nanotubes have an outer diameter in a range of about 0.5 nm and about 3 nm, wherein the carbon nanotube particulate has a cross-sectional dimension in a range of about 0.1 micron and about 100 microns.
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Abstract
A carbon nanotube electron emitter comprises carbon nanotube particulates on a surface, wherein the carbon nanotube particulates comprise entangled small-diameter carbon nanotubes having one, two, three or four walls and having an outer wall diameter in the range of about 0.5 nm and about 3 nm. The carbon nanotube particulate electron emitter has a cross-sectional dimensional in a range of about 0.1 micron and about 100 microns, preferably about 0.1 micron to about 3 microns. The carbon nanotube particulate electron emitters can comprise ropes of carbon nanotubes. The carbon nanotube particulates are easily dispersed in polymers and other media. The carbon nanotube particulates can be dispersed in a viscous media and applied to a surface by various means. The carbon nanotube particulate electron emitter exhibits very low “turn-on” emission field and can be used in a variety of field emission devices.
95 Citations
23 Claims
- 1. An electron emitter comprising a carbon nanotube particulate on a surface wherein the carbon nanotube particulate comprises entangled small-diameter carbon nanotubes wherein the small-diameter nanotubes have an outer diameter in a range of about 0.5 nm and about 3 nm, wherein the carbon nanotube particulate has a cross-sectional dimension in a range of about 0.1 micron and about 100 microns.
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10. The electron emitter of claim 10 wherein the field emission device is selected from the group consisting of electron tubes, amplifiers, oscillators, mixers, microwave components, discharge initiators, laser tubes, spark gaps, controlled discharge tubes, directed energy devices, display tubes, flat-panel displays and combinations thereof.
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11. A method for making a carbon nanotube electron emitter, comprising:
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(a) providing a carbon nanotube particulate wherein the carbon nanotube particulate comprises entangled small-diameter carbon nanotubes, wherein the small-diameter nanotubes have an outer diameter in a range of about 0.5 nm and about 3 nm, wherein the carbon nanotubes are selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, triple-walled carbon nanotubes, quadruple-walled carbon nanotubes and combinations thereof, and wherein the carbon nanotube particulate has a cross-sectional dimension in a range of about 0.1 micron and about 100 microns, and (b) depositing the carbon nanotube particulate on a surface. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification