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Carbon nanotube field emission cathode and preparation method thereof

A field emission cathode and carbon nanotube technology, applied in the field emission field, can solve the problems of small field emission current, weak bonding force between carbon nanotube layer and conductive substrate, large contact resistance, etc.

Active Publication Date: 2016-08-24
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with the electrophoresis method is that the bonding force between the carbon nanotube layer and the conductive substrate is weak, and the contact resistance is large, resulting in a small field emission current and unstable emission.

Method used

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  • Carbon nanotube field emission cathode and preparation method thereof
  • Carbon nanotube field emission cathode and preparation method thereof
  • Carbon nanotube field emission cathode and preparation method thereof

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preparation example Construction

[0051] see figure 2 , the preparation method of the carbon nanotube field emission cathode of one embodiment, comprises the steps:

[0052] Step S110: providing a conductive substrate.

[0053] The conductive substrate can be a metal substrate such as a stainless steel substrate, a titanium substrate, a copper substrate, an aluminum substrate, a chromium substrate or a nickel substrate; or a metal substrate coated with tungsten, molybdenum, titanium, nickel, chromium, gold, silver or platinum Insulating substrate, wherein the insulating substrate is glass, ceramic or silicon wafer.

[0054] In another embodiment, the conductive substrate is ITO glass.

[0055] The conductive substrate was ultrasonically cleaned with acetone and ethanol for 10 minutes in sequence, and then dried with nitrogen gas for later use.

[0056] Step S120: Prepare graphene-containing electrophoretic fluid and carbon nanotube-containing electrophoretic fluid respectively.

[0057] The graphene and t...

Embodiment 1

[0094] Preparation of Carbon Nanotube Field Emission Cathode

[0095] (1) Add reduced graphene with a thickness of 1.1-3.7nm to absolute ethanol, and add 50% MgCl 2 (Based on the mass of graphene) as the first charge additive, the concentration of graphene is 0.05 mg / ml, ultrasonically dispersed for 1 hour, and an electrophoretic solution containing graphene is obtained;

[0096] (2) Add multi-walled carbon nanotubes with a diameter of less than 8 nm and a length of 5 to 15 μm in absolute ethanol, and add 25% MgCl 2 (Based on the mass of carbon nanotubes) as the second charge additive, the concentration of carbon nanotubes is 0.01 mg / ml, ultrasonically dispersed for 1 hour, and an electrophoretic solution containing carbon nanotubes is obtained;

[0097] (3) ITO glass was used as the conductive substrate, the conductive substrate was used as the cathode, and the oxygen-free copper sheet was used as the anode. Before use, it was ultrasonically cleaned with acetone and ethanol ...

Embodiment 2

[0101] Preparation of Carbon Nanotube Field Emission Cathode

[0102] (1) Add graphene oxide with a thickness of 5.0-8.6nm into absolute ethanol, and add 1% Mg(NO 3 ) 2 (Based on the mass of graphene) as the first charge additive, the concentration of graphene is 0.5 mg / ml, ultrasonically dispersed for 1 hour, and an electrophoretic solution containing graphene is obtained;

[0103] (2) Add single-walled carbon nanotubes with a diameter of less than 10-20 nm and a length of 10-20 μm into absolute ethanol, and add 1% Mg(NO 3 ) 2 (Based on the mass of carbon nanotubes) as the second charge additive, the concentration of carbon nanotubes is 0.1 mg / ml, ultrasonically dispersed for 3 hours, and an electrophoretic solution containing carbon nanotubes is obtained;

[0104] (3) The glass substrate deposited with a metal titanium layer was used as the conductive substrate, the conductive substrate was used as the cathode, and the stainless steel sheet was used as the anode. Before u...

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Abstract

The invention relates to a carbon nanotube field emission cathode and a preparation method thereof. The carbon nanotube field emission cathode includes a conductive substrate and a graphene layer and a carbon nanotube layer stacked on the conductive substrate in sequence. The theoretical specific surface area of ​​graphene is as high as 2600m 2 / g, its unique two-dimensional structure can carry out effective electrothermal transmission, and has better thermal and electrical properties than carbon nanotubes. A graphene layer is set between the conductive substrate and the carbon nanotube layer to give full play to the specific surface area of ​​graphene. The characteristics of huge size and excellent conduction and heat dissipation can improve the adhesion of the carbon nanotube layer, improve the emission current and stability.

Description

technical field [0001] The invention relates to the technical field of field emission, in particular to a carbon nanotube field emission cathode and a preparation method thereof. Background technique [0002] Carbon nanotube is a new type of carbon nanomaterial, which has excellent electrical conductivity, excellent electron emission capability and stable mechanochemical properties produced by nanoscale tips, and is an ideal field emission material. In order to be able to switch instantly, the opening electric field is low, and the emission current density is large, which is expected to be widely used in the field emission field. [0003] The key to the application of carbon nanotubes in field emission is to prepare a carbon nanotube cathode that can continuously and stably emit electrons and has a large emission current. Currently, commonly used methods include chemical vapor deposition (CVD), screen printing, and electrophoresis. Among them, the electrophoresis process i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/304H01J9/02
Inventor 洪序达陈婷陈垚郑海荣
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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