Curing binder material for carbon nanotube electron emission cathodes
AssigneeSamsung Electronics Co., Ltd.
InventorYunjun Li
Life of this patent
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Abstract
A binder material, inorganic polymer, is used to formulate carbon nanotube pastes. This material can be cured at 200° C. and has a thermal-stability up to 500° C. Low-out gassing of this binder material makes it a good candidate for long life field emission devices. Due to better adhesion with this binder material, a strong adhesive peelable polymer from liquid form can be applied on the CNT cathode to achieve a uniform activation with even contact and pressure on the surface. The peelable polymer films may be used both as an activation layer and a mask layer to fabricate high-resolution patterned carbon nanotube cathodes for field emission devices using lithographic processes.
Claims14
A composite for a field emission cathode, comprising an inorganic polymer mixed with carbon nanotubes wherein the inorganic polymer is a silicon-containing, ladder-like polymer.
A composite comprising a mixture of carbon nanotubes, graphite powder and an inorganic polymer, wherein the inorganic polymer is a silicon-containing, ladder-like polymer.
A field emission cathode comprising:
- a substrate;
- a field emitter on the substrate wherein the field emitter comprises a paste comprising carbon nanotubes and an inorganic polymer, wherein the inorganic polymer is a silicon-containing, ladder-like polymer;
- and
- circuitry for producing an electric field to cause a field emission of electrons from the field emitter.
A field emission cathode comprising:
- a substrate;
- a field emitter on the substrate wherein the field emitter comprises a paste comprising carbon nanotubes and an inorganic polymer;
- and
- circuitry for producing an electric field to cause a field emission of electrons from the field emitter, wherein the cathode is configured to be activated by forming a film from a liquid polymer solution over the cathode, followed by peeling the film off the cathode, wherein the cathode is configured to have an emission current that increases from about 5 mA at an electric field of about 2.4 (V/ium) to about 30 mA at an electric field of about 3.5 (V/ium).
A field emission cathode comprising:
- a substrate;
- a field emitter on the substrate wherein the field emitter comprises a paste comprising carbon nanotubes and an inorganic powder, the inorganic powder comprises a silicon containing, ladder-like polymer;
- and circuitry for producing an electric field to cause a field emission of electrons from the field emitter.
A field emission cathode comprising:
- a substrate;
- a field emitter on the substrate wherein the field emitter comprises a paste comprising carbon nanotubes and an inorganic powder;
- and
- circuitry for producing an electric field to cause a field emission of electrons from the field emitter, wherein the field emission cathode is configured to have an emission current that increases from about 5 mA at an electric field of about 2.4 (V/ium) to about 30 mA at an electric field of about 3.5 (V/ium).
Dependencies are inferred from the claim text.