Graphene field emission cathode and preparation method thereof

A technology for emitting cathodes and graphene, which is applied in the field of field emission, can solve problems such as increasing the field emission current of graphene field emission cathodes, and achieve the effects of improving emission stability, reducing work function, and reducing the opening electric field

Pending Publication Date: 2021-12-24
SHENZHEN INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the invention provides a graphene field emission cathode and preparation method thereof, to solve the problem of how to increase the field emission current of the graphene field emission cathode

Method used

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  • Graphene field emission cathode and preparation method thereof
  • Graphene field emission cathode and preparation method thereof
  • Graphene field emission cathode and preparation method thereof

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preparation example Construction

[0041] The embodiment of the present invention also provides the preparation method of graphene field emission cathode as described above, and described preparation method comprises the following steps:

[0042] S10, providing the conductive substrate and performing cleaning treatment.

[0043] In a specific technical solution, the cleaning treatment may specifically include: placing the conductive substrate in deionized water and absolute ethanol in sequence for ultrasonic cleaning, and then drying it with nitrogen gas for later use.

[0044] S20, preparing a mixed solution containing graphene oxide and target metal ions.

[0045] In a preferred solution, the step S20 includes:

[0046] S21. Prepare a graphene oxide nanosheet dispersion.

[0047] Specifically, the prepared graphene oxide nanosheets are added into deionized water, and dispersed by ultrasonic dispersion, the ultrasonic power is 100W-200W, and the time is 1h-3h. After the ultrasonication is over, centrifugation...

Embodiment 1

[0060] The present embodiment provides a graphene field emission cathode, the conductive base of the graphene field emission cathode is selected as a titanium substrate, on the titanium substrate growth is upright graphene nanosheets, combined with the graphene nanosheets on the surface of the graphene nanosheets The metal nanoparticles are palladium nanoparticles. The preparation process of the graphene field emission cathode of the present embodiment is as follows:

[0061] 1) The titanium conductive substrate was ultrasonically cleaned in deionized water and absolute ethanol for 10 min, and then dried with nitrogen.

[0062] 2) ultrasonically disperse multilayer graphene oxide with a lateral size of 1 μm to 10 μm and a thickness of 1 nm to 3 nm in deionized water to form a graphene oxide dispersion with a concentration of 0.1 g / L, and add Na 2 PdCl 4 Dissolved in deionized water to give Na 2 PdCl 4 aqueous solution. Then, Na 2 PdCl 4 The aqueous solution was added to...

Embodiment 2

[0068] The present embodiment provides a graphene field emission cathode, the conductive base of the graphene field emission cathode is selected as a titanium substrate, on the titanium substrate growth is upright graphene nanosheets, combined with the graphene nanosheets on the surface of the graphene nanosheets The metal nanoparticles are platinum nanoparticles. The preparation process of the graphene field emission cathode of the present embodiment is as follows:

[0069] 1) The titanium conductive substrate was ultrasonically cleaned in deionized water and absolute ethanol for 10 min, and then dried with nitrogen.

[0070] 2) Ultrasonic disperse multilayer graphene oxide with a lateral size of 1 μm to 10 μm and a thickness of 1 nm to 3 nm in deionized water to form a graphene oxide dispersion with a concentration of 0.2 g / L, and mix H 2 PtCl 6 Dissolved in deionized water to give H 2 PtCl 6 aqueous solution. Then, the H 2 PtCl 6 The aqueous solution was added to the...

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Abstract

The invention discloses a graphene field emission cathode and a preparation method thereof. The graphene field emission cathode comprises a conductive substrate; a graphene nanosheet vertically grown on the conductive substrate; and metal nanoparticles combined on the surface of the graphene nanosheet. According to the graphene field emission cathode provided by the invention, the density of electron emission tips and the number of effective emission tips can be greatly increased, and the field emission current can be improved.

Description

technical field [0001] The invention relates to the technical field of field emission, in particular to a graphene 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, field emission cold cathodes based on various one-dimensional / two-dimensional nanomaterials have received extensive attention and resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/304H01J9/02B82Y10/00B82Y40/00
CPCH01J1/3044H01J9/025B82Y10/00B82Y40/00
Inventor 洪序达梁栋郑海荣
Owner SHENZHEN INST OF ADVANCED TECH
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