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Carbon nano tube cathode and preparation method thereof

A carbon nanotube cathode, carbon nanotube technology, applied in the field of materials, can solve the problems of reducing the tip of carbon nanotubes, non-wetting properties of carbon nanotubes and binders, small field emission current, etc., so as to improve the emission The effect of current and current stability, reducing spark phenomenon, and reducing contact resistance

Active Publication Date: 2014-01-29
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the electrophoresis method is that the binding force between the carbon nanotubes and the substrate is weak, and the contact resistance is large, resulting in a small field emission current and unstable emission.
However, in the first method, the carbon nanotube tips are easily coated in the binder matrix, so that the effective emission of the carbon nanotube tips is significantly reduced, reducing the field emission performance; in the second method, due to the carbon nanotubes and the adhesive The non-wetting or wettability of the binder is poor, and the adhesion improvement effect is not ideal

Method used

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  • Carbon nano tube cathode and preparation method thereof
  • Carbon nano tube cathode and preparation method thereof
  • Carbon nano tube cathode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The preparation method of the carbon nanotube cathode described in this embodiment comprises the following steps:

[0032] (1) Electrophoretic deposition of adhesive layer on conductive substrate

[0033] (1a) Mix 100mg of glass powder particles, 30mg of nano-titanium powder (10nm in diameter) and 5% MgCl 2 (Based on the weight of glass powder) added to 100ml of absolute ethanol, and ultrasonically dispersed for 1 hour to obtain a binder electrophoretic solution;

[0034] (1b) Choose a stainless steel sheet and an oxygen-free copper sheet as electrodes, and clean them ultrasonically with acetone and ethanol for 10 minutes before use, N 2 Blow dry; then, use the stainless steel sheet as the cathode and the oxygen-free copper sheet as the anode, insert it into the binder electrophoretic solution, the distance between the cathode and the anode is 1cm, and perform electrophoresis under the action of a DC electric field, the electrophoresis voltage is 50V, and the electroph...

Embodiment 2

[0042] The preparation method of the carbon nanotube cathode described in this embodiment comprises the following steps:

[0043] (1) Electrophoretic deposition of adhesive layer on conductive substrate

[0044] (1a) Mix 500mg glass powder, 300mg nano-iron powder (diameter 50nm) and 1%AlCl 3 (Based on the weight of glass powder) added to 250ml of absolute ethanol, and ultrasonically dispersed for 2 hours to obtain a binder electrophoretic solution;

[0045] (1b) Select nickel sheet and oxygen-free copper sheet as electrodes, and use acetone and ethanol to ultrasonically clean them for 10 minutes before use, N 2 blow dry. Then, the nickel sheet was used as the cathode, and the oxygen-free copper sheet was used as the anode, inserted into the binder solution, the distance between the cathode and the anode was 0.1 cm, and electrophoresis was performed under the action of a DC electric field, the electrophoresis voltage was 100V, and the electrophoresis time was 5s. forming an ...

Embodiment 3

[0053] The preparation method of the carbon nanotube cathode described in this embodiment comprises the following steps:

[0054] (1) Electrophoretic deposition of adhesive layer on conductive substrate

[0055] (1a) Mix 150mg glass powder, 67.5mg nano-silver powder (100nm in diameter) and 2.5%NiCl 2 (Based on the weight of glass powder) added to 100ml of absolute ethanol, and ultrasonically dispersed for 2 hours to obtain a binder electrophoretic solution;

[0056] (1b) Choose titanium sheet and oxygen-free copper sheet as electrodes, and use acetone and ethanol to ultrasonically clean them for 10 minutes before use, N 2 Blow dry; then, with the titanium sheet as the cathode and the oxygen-free copper sheet as the anode, insert it into the binder solution with a distance of 0.5 cm between the cathode and the anode, and perform electrophoresis under the action of a DC electric field with an electrophoresis voltage of 70V and an electrophoresis time of 20s. forming an adhesiv...

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Abstract

The invention provides a preparation method of a carbon nano tube cathode and the carbon nano tube cathode obtained through the method. The preparation method includes the steps that a bonding agent layer is arranged on an electric conduction substrate in an electrophoretic deposition mode; a carbon nano tube thin film is arranged on the electric conduction substrate in an electrophoretic deposition mode, wherein the bonding agent layer is also deposited on the electric conduction substrate; in a vacuum or protective atmosphere environment, hot pressed sintering is conducted on the carbon nano tube thin film and the bonding agent layer, so that the carbon nano tube cathode is obtained. According to the carbon nano tube cathode and the preparation method thereof, the hot pressed sintering technology is adopted, the root portion of a carbon nano tube is embedded into a base body of a bonding agent under the action of pressure, so that firm combination is formed, meanwhile, the contact resistance of the carbon nano tube and the base body is lowered, hence, emission currents of the carbon nano tube are increased, and the current stability of the carbon nano tube is improved.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a carbon nanotube cathode and a preparation method thereof. Background technique [0002] Carbon nanotube is a new type of carbon nanomaterial. Compared with other existing substances, it has excellent electrical conductivity, excellent electron emission ability and stable mechanochemical properties produced by nanoscale tips. It is a It is an ideal field emission material, which can be switched on and off instantly, with low electric field and high emission current density. It is expected to be widely used in vacuum electronics fields such as flat panel displays, X-ray sources, and microwave amplifiers. [0003] The key to the field emission application of carbon nanotubes is to prepare carbon nanotube cathodes with good surface morphology and continuous and stable electron emission. In the prior art, methods for preparing carbon nanotube field emission cathodes include chemical vapor ...

Claims

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Application Information

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Patent Type & Authority Applications(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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