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A field emission cathode with double-layer nano-carbon coating and preparation method thereof

A field emission cathode and nanocarbon technology, which is applied in cold cathode manufacturing, coating, electrode system manufacturing, etc., can solve the problems of limited growth area and complex film growth process, and achieve high production yield, good field emission characteristics, Simple effect of electrophoretic deposition process

Active Publication Date: 2017-04-19
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the characteristics of the field emission cathode are excellent, the growth process of the thin film is relatively complicated, and the growth area is limited, which is not conducive to the development of the field emission cathode towards low-cost and large-area practical application.

Method used

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  • A field emission cathode with double-layer nano-carbon coating and preparation method thereof
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  • A field emission cathode with double-layer nano-carbon coating and preparation method thereof

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Embodiment

[0035] The present embodiment provides a kind of preparation method of the field emission cathode with double-layer nano-carbon coating as described above, the method specifically comprises the following steps:

[0036] Step 1: select a metal titanium sheet as the substrate, grind and polish one side of the metal titanium sheet, place it in acetone for ultrasonic cleaning, then rinse with deionized water and then dehydrate with ethanol;

[0037] Step 2, configure nano-diamond electrophoretic fluid: select a mixture with a mass ratio of nano-diamond: iodine = 1:2 as a solute; select a mixture with a volume ratio of deionized water: acetone: isopropanol = 1:1:20 as a solvent , so that the nano-diamond content is 0.23mg / ml;

[0038] After mixing the solute and solvent, carry out ultrasonic dispersion, ultrasonic power 99W, ultrasonic time 30min, ultrasonic temperature 30 ℃ ~ 40 ℃, to form a uniformly mixed nano-diamond powder electrophoretic fluid;

[0039] Step 3, the polished ...

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Abstract

The invention provides a field emission cathode with a double-layer nanocarbon coating and a preparation method. First, nanodiamond is coated on a substrate through electrophoretic deposition to form a nanodiamond coating; then nanocarbon tubes are deposited through electrophoresis. The method is coated on the nanodiamond coating to form a carbon nanotube coating; finally, heat treatment is performed in a hot wire chemical vapor deposition system to cause a chemical bonding reaction between the substrate and the nanodiamond coating to obtain a chemical bonding layer. Obtain a field emission cathode with a four-layer structure of substrate - chemical bonding layer - nanodiamond coating - nanocarbon tube coating. This field emission cathode has the advantages of both carbon nanotubes and nanodiamond and has good field emission characteristics. and field emission stability.

Description

technical field [0001] The invention relates to a field emission display cathode in the technical field of electronic display, in particular to a field emission cathode with a double-layer nano-carbon coating and a preparation method. Background technique [0002] Carbon nanotubes have low threshold voltage, large field enhancement factor, and large field emission current, so they are an ideal field emission cathode material. However, the poor thermal contact between carbon nanotubes and substrate materials leads to poor stability of the emission current, which limits its application in the field of field emission. Nanodiamond has high thermal conductivity, and nanodiamond has low work function and negative electron affinity, and it is also an excellent field emission cathode material. Adding nano-diamonds between the substrate and the carbon nanotubes can improve the thermal contact between the substrate and the carbon nanotubes, and improve their field emission stability....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/304H01J9/02C25D15/00
Inventor 翟春雪张志勇赵武赵丽丽王雪文闫军锋贠江妮
Owner NORTHWEST UNIV
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