Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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, and achieve the effect of reducing the potential barrier and improving the field emission current.

Active Publication Date: 2020-04-28
SHENZHEN INST OF ADVANCED TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Field emission cathode and preparation method thereof
  • Field emission cathode and preparation method thereof
  • Field emission cathode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

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

[0035] S01. Providing a conductive substrate;

[0036] S02. Configure the hexagonal boron nitride nanosheet dispersion, deposit the hexagonal boron nitride nanosheet dispersion on the conductive substrate, form a hexagonal boron nitride nanosheet film after drying, and obtain a 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 Increase the forward voltage until the ignition phenomenon occurs, and obtain the hexagonal boron nitride nanosheet field emission cathode.

[0038] The preparation method of the field emission cathode provided by the embodime...

Embodiment 1

[0066] A method for preparing a field emission cathode, comprising the following steps:

[0067] Provide a conductive substrate;

[0068] Configured in the hexagonal boron nitride nanosheet dispersion, deposit the hexagonal boron nitride nanosheet dispersion on the conductive substrate to prepare the hexagonal boron nitride nanosheet film, and the hexagonal boron nitride nanosheet film in the hexagonal boron nitride nanosheet film Boron nanosheets have a size of 0.1 μm to 10 μm and a thickness of 1 nm to 50 nm;

[0069] Provide an anode, use the substrate containing the hexagonal boron nitride nanosheet film as a cathode, set the distance between the cathode and the anode to be 200 μm, and process the cathode as ground; place the cathode and the anode in a vacuum environment , at a vacuum of 1×10 -5 ~1×10 -7 Under certain conditions, a gradually increasing forward voltage is applied to the anode until a sparking phenomenon occurs, and a hexagonal boron nitride nanosheet fie...

Embodiment 2

[0076] A method for preparing a field emission cathode, comprising the following steps:

[0077] Provide a conductive substrate;

[0078] Provide the hexagonal boron nitride nanosheet raw material, add the hexagonal boron nitride nanosheet raw material into the solvent, ultrasonically treat it for 24 hours under the condition of ultrasonic power of 200W, and centrifuge to prepare the 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 is deposited on the conductive substrate to prepare a hexagonal boron nitride nanosheet 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 vacuum degree is 1×10 -5 – 1×10 -7 Under certain conditions, a gradually increasing forward voltage is applie...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
sizeaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a field emission cathode. The preparation method comprises the steps of providing a conductive substrate; preparing a hexagonal boron nitride nanosheet dispersion liquid, depositing the hexagonal boron nitride nanosheet dispersion liquid on the conductive substrate, and drying to form a hexagonal boron nitride nanosheet film so as to obtain a substrate containing the hexagonal boron nitride nanosheet film; providing an anode, taking the substrate containing the hexagonal boron nitride nanosheet film as a cathode, and grounding the cathode; and placing the cathode and the anode in a vacuum environment, and applying gradually increasing forward voltage to the anode until a sparking phenomenon occurs so as to obtain the hexagonal boron nitride nanosheet field emission cathode.

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, 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. Currently, the most widely used cathode is the metal hot cathode. However, hot cathodes have defects such as large volume, large heat radiation power consumption, long turn-on time, and material evaporation at high temperatures, which limit 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 research...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com