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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 of field emission, can solve the problems of poor emission stability of the emission cathode, achieve the effect of increasing emission sites, increasing specific surface area, and improving emission stability

Pending Publication Date: 2022-01-28
SHENZHEN INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a carbon nanotube field emission cathode and a preparation method thereof to solve the problem of poor emission stability of the existing carbon nanotube field emission cathode

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

[0040] The embodiment of the present invention also provides a method for preparing the carbon nanotube field emission cathode as described above, the preparation method comprising the following steps:

[0041] S10, providing carbon nanotubes and having carboxylic acid groups on their surfaces through a surface treatment process.

[0042] Specifically, the step S10 includes: mixing the carbon nanotubes with the acid solution and then refluxing the reaction at a temperature of 100°C to 200°C for 1h to 10h, and then washing with deionized water for several times to obtain a carbon nanotube with carboxylic acid groups on the surface. group of carbon nanotubes.

[0043] In a preferred scheme, the carbon nanotubes are subjected to HF and HNO 3 The mixed solution was purified and then added concentrated nitric acid, followed by reflux reaction, and then washed with deionized water for many times to obtain carbon nanotubes with carboxylic acid groups on the surface. Wherein, the te...

Embodiment 1

[0058] This embodiment provides a carbon nanotube field emission cathode and a preparation method thereof, including:

[0059] 1) Change CH 4 The carbon nanotubes are prepared by catalytic cracking at 700°C.

[0060] 2) subjecting the carbon nanotubes to HF and HNO 3 After the mixed solution was purified, concentrated nitric acid was added, and then refluxed at 140° C. for 2 hours, and then washed with deionized water several times to obtain carbon nanotubes with carboxylic acid groups on the surface.

[0061] 3) 0.3g molybdenum sulfate, 0.5g thiourea, 0.5mL hydrogen peroxide (concentration is 30%) and 0.05g step 2) the carbon nanotube that obtains is put into autoclave polytetrafluoroethylene liner, and add A certain amount of deionized water was ultrasonically dispersed for 30 minutes, put into a stainless steel sleeve and sealed, kept at a constant temperature of 240°C for 24 hours, after cooling down to room temperature naturally, it was filtered and rinsed with ethanol ...

Embodiment 2

[0067] The difference between this example and example 1 is that step 3) is a different process for preparing carbon nanotubes with molybdenum sulfide nanoparticles bound to the surface, and the rest of the process steps are the same as those of example 1.

[0068] Specifically, in step 3), 0.37g ammonium thioacetate, 3.7g molybdenum acetate, 0.1g sodium dodecylsulfonate and 0.05g carbon nanotubes are put into the polytetrafluoroethylene liner of the autoclave, and Add a certain amount of deionized water, ultrasonically disperse for 30 minutes, put it into a stainless steel sleeve and seal it, keep the temperature at 240 ° C for 24 hours, wait for natural cooling to room temperature, filter and rinse with ethanol and deionized water, and then vacuum dry the sample at 80 ° C , to obtain carbon nanotubes with molybdenum sulfide nanoparticles bound on the surface.

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Abstract

The invention discloses a carbon nanotube field emission cathode. The cathode comprises: a conductive substrate; a carbon nanotube formed on the conductive substrate; and molybdenum sulfide nanoparticles bonded on the surface of the carbon nanotube. The preparation method of the carbon nanotube field emission cathode comprises the following steps: providing a carbon nanotube and enabling the surface of the carbon nanotube to have carboxylic acid groups through a surface treatment process; dissolving the carbon nanotube, a molybdenum source, a sulfur source and a surfactant in a solvent, carrying out ultrasonic dispersion, and then carrying out a heating reaction to obtain a carbon nanotube of which the surface is combined with molybdenum sulfide nanoparticles; placing the carbon nanotube in a ball milling tank, adding an organic solvent and a ball milling auxiliary agent, and carrying out ball milling to obtain carbon nanotube slurry; printing the carbon nanotube slurry on a conductive substrate through a screen printing process; and heating and curing the conductive substrate, and carrying out annealing treatment to prepare the carbon nanotube field emission cathode. The carbon nanotube field emission cathode provided by the invention can reduce the starting electric field and improve the emission 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] Vacuum electronic devices are widely used in communication, space technology, safety detection, medical imaging and other fields. The core component of a vacuum electronic device is the cathode, which is used to generate the electron beam required for the vacuum device to work. At present, the most widely used cathode is the metal hot cathode. However, the hot cathode has defects such as large volume, large heat radiation power consumption, long turn-on time, and material evaporation at high temperature, which limits the development of vacuum electronic devices in the direction of miniaturization and integration. . [0003] In recent years, carbon nanotubes (CNTs) have received extensive attention and research as electron emission sources in field emission devices. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/304H01J9/02B82Y10/00B82Y30/00B82Y40/00
CPCH01J1/304H01J9/025B82Y10/00B82Y40/00B82Y30/00
Inventor 洪序达贺思如梁栋郑海荣
Owner SHENZHEN INST OF ADVANCED TECH
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