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Field emission cathode and preparation method thereof

A field emission cathode and cathode technology, applied in the field emission field, can solve the problems of low current density and poor emission stability, etc.

Active Publication Date: 2022-07-05
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a field emission cathode and its manufacturing method, aiming to solve the problems of low current density and poor long-term emission stability in the existing two-dimensional nanomaterial field emission cathode

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  • Field emission cathode and preparation method thereof

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preparation example Construction

[0034] In view of this, a first aspect of the embodiments of the present invention provides a method for preparing a field emission cathode, comprising the following steps:

[0035] S01. Provide conductive substrate;

[0036] S02. Configure a hexagonal boron nitride nanosheet dispersion liquid, deposit the hexagonal boron nitride nanosheet dispersion liquid on the conductive substrate, and form a hexagonal boron nitride nanosheet film after drying to obtain a hexagonal boron nitride nanosheet film containing hexagonal boron nitride nanosheets the substrate;

[0037] S03. Provide an anode, use the substrate containing the hexagonal boron nitride nanosheet film as a cathode, and ground the cathode; place the cathode and the anode in a vacuum environment, and gradually apply a voltage to the anode The forward voltage is increased until the spark phenomenon occurs, and the hexagonal boron nitride nanosheet field emission cathode is obtained.

[0038] In the preparation method of...

Embodiment 1

[0066] A preparation method of a field emission cathode, comprising the following steps:

[0067] Provide conductive substrate;

[0068] Disposing in hexagonal boron nitride nanosheet dispersion liquid, depositing hexagonal boron nitride nanosheet dispersion liquid on the conductive substrate to prepare hexagonal boron nitride nanosheet film, the hexagonal boron nitride nanosheet film in the hexagonal boron nitride nanosheet film The size of boron nanosheets is 0.1μm~10μm, and the thickness is 1nm~50nm;

[0069] An anode is provided, the substrate containing the hexagonal boron nitride nanosheet film is used as a cathode, the distance between the cathode and the anode is set to 200 μm, and the cathode is grounded; the cathode and the anode are placed in a vacuum environment , in a vacuum of 1×10 -5 ~1×10 -7 A forward voltage with a gradually increasing voltage is applied to the anode under the condition of , until a spark phenomenon occurs, and a hexagonal boron nitride nan...

Embodiment 2

[0076] A preparation method of a field emission cathode, comprising the following steps:

[0077] Provide conductive substrate;

[0078] Provide hexagonal boron nitride nanosheet raw material, add the hexagonal boron nitride nanosheet raw material into a solvent, ultrasonically treat it for 24 hours under the condition of ultrasonic power of 200W, and centrifuge to prepare a hexagonal boron nitride nanosheet dispersion. The concentration of the hexagonal boron nitride nanosheet solution may be 1 mg / ml; the hexagonal boron nitride nanosheet dispersion liquid is deposited on the conductive substrate to prepare a hexagonal boron nitride nanosheet thin film;

[0079] An anode is provided, the substrate containing the hexagonal boron nitride nanosheet film is used as a cathode, and the cathode is grounded; the cathode and the anode are placed in a vacuum environment, and the degree of vacuum is 1×10 -5 –1×10 -7 A forward voltage with a gradually increasing voltage is applied to t...

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Abstract

The invention provides a preparation method of a field emission cathode, which comprises the following steps: providing a conductive substrate; configuring a dispersion liquid of hexagonal boron nitride nanosheets, depositing the dispersion liquid of hexagonal boron nitride nanosheets on the conductive substrate, and drying Then, a hexagonal boron nitride nanosheet film is formed to obtain a substrate containing the hexagonal boron nitride nanosheet film; an anode is provided, the substrate containing the hexagonal boron nitride nanosheet film is used as a cathode, and the cathode is grounded; The cathode and the anode are placed in a vacuum environment, and a forward voltage whose voltage is gradually increased is applied to the anode until a spark phenomenon occurs, thereby obtaining a field emission cathode of hexagonal boron nitride nanosheets.

Description

technical field [0001] The invention belongs to the technical field of field emission, and in particular relates to a field emission cathode and a preparation method thereof. Background technique [0002] Vacuum electronic devices are widely used in communication, space technology, security detection, medical imaging and other fields. The core component of vacuum electronic devices is the cathode, which is used to generate the electron beam current required for the operation of vacuum devices. Currently, the most widely used cathodes are metal hot cathodes. However, hot cathodes have defects such as large volume, large thermal radiation power consumption, long turn-on time, and material evaporation at high temperatures, which limit the development of vacuum electronic devices towards miniaturization and integration. [0003] In recent years, field emission cold cathodes based on various one-dimensional / two-dimensional nanomaterials have received extensive attention and res...

Claims

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Application Information

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