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Carbon nanometer field emission cathode and its preparation method and application

A field emission cathode and carbon nanotechnology, applied in the field of field emission, can solve the problems of few effective emission tips, poor emission stability, small emission current, etc., achieve excellent field emission performance, stable performance, and increase the effect of emission tips

Active Publication Date: 2017-11-10
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, provide a kind of carbon nanometer field emission cathode and its preparation method and its application, to overcome existing carbon nanometer field emission cathode to have few effective emission tips, cause emission current to be small, emission Poor stability, a technical problem that limits its application

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  • Carbon nanometer field emission cathode and its preparation method and application
  • Carbon nanometer field emission cathode and its preparation method and application
  • Carbon nanometer field emission cathode and its preparation method and application

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preparation example Construction

[0029] On the other hand, on the basis of the carbon nanometer field emission cathode of the embodiment of the present invention described above, the embodiment of the present invention also provides a preparation method of the carbon nanometer field emission cathode of the embodiment of the present invention. The preparation method of the carbon nanometer field emission cathode of the embodiment of the present invention is as follows figure 2 Therefore, see also figure 1 , its preparation method comprises the following steps:

[0030] S01. Forming a carbon nanotube layer 2 on the surface of the conductive substrate 1;

[0031]S02. Molybdenum disulfide and / or tungsten disulfide nanosheet layer 3 is formed on the surface of the carbon nanotube layer 2: Molybdenum disulfide and / or tungsten disulfide nanosheets are dispersed in an organic solvent to form a dispersion, and then the The dispersion liquid forms a molybdenum disulfide and / or tungsten disulfide nanosheet layer 3 on...

Embodiment 1

[0063] The embodiment of the present invention provides a carbon nanometer field emission cathode and a preparation method thereof, which include a conductive substrate 1 / carbon nanotube layer 2 / molybdenum disulfide nanosheet layer 3 sequentially stacked and combined. Among them, the conductive substrate 1 is made of copper sheet; the carbon nanotubes in the carbon nanotube layer 2 are multi-walled carbon nanotubes with a diameter of 2-8nm and a length of 10-15μm; the thickness of the molybdenum disulfide nanosheets is 1nm , the lateral dimension is 100-300nm,

[0064] Its preparation method is as follows:

[0065] S11. Provide conductive substrate: copper sheet

[0066] S12. Preparation of carbon nanotube film 2 by electrophoretic deposition method:

[0067] S121. Combining carbon nanotubes with soluble metal inorganic salt MgCl 2 Add in ethanol, ultrasonically disperse for 1 to 3 hours to obtain a uniform and stable carbon nanotube electrophoresis solution, the concentrat...

Embodiment 2

[0072] The embodiment of the present invention provides a carbon nanometer field emission cathode and a preparation method thereof, which comprises sequentially stacking and bonding a conductive substrate 1 / carbon nanotube layer 2 / tungsten disulfide nanosheet layer 3. Wherein, the conductive substrate 1 material is a stainless steel sheet; the carbon nanotubes in the carbon nanotube layer 2 are single-walled carbon nanotubes with a diameter of 1-2 nm and a length of 10-20 μm; the thickness of the tungsten disulfide nanosheets is 2 -4nm with a lateral dimension of 100-300nm.

[0073] Its preparation method is as follows:

[0074] S21. Provide conductive substrate: silicon wafer

[0075]S22. Preparation of carbon nanotube film 2 by electrophoretic deposition method:

[0076] S221. Combining carbon nanotubes with soluble metal inorganic salt Al(NO 3 ) 2 Add in ethanol, ultrasonically disperse for 1 to 3 hours to obtain a uniform and stable carbon nanotube electrophoresis solu...

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Abstract

The invention discloses a carbon nano field emission cathode, a preparation method and application thereof. The carbon nano field emission cathode includes an electric conduction substrate, a carbon nanotube layer formed on the surface of the electric conduction substrate and a molybdenum disulfide and / or tungsten disulfide nano sheet layer formed on the outer surface of the carbon nanotube layer. The preparation method of the carbon nano field emission cathode includes the following steps that: a carbon nanotube layer formed on the surface of an electric conduction substrate; and a molybdenum disulfide and / or tungsten disulfide nano sheet layer is formed on the surface of the carbon nanotube layer. The carbon nano field emission cathode of the invention has a large number of effective emission tips. The carbon nano field emission cathode has the advantages of low field emission voltage, high current and stable emission performance. With the preparation method of the carbon nano field emission cathode adopted, the stable performance of the carbon nano field emission cathode can be ensured, and the production cost of the carbon nano field emission cathode can be reduced.

Description

technical field [0001] The invention belongs to the technical field of field emission, and in particular relates to a carbon nanometer field emission cathode and its preparation method and application. Background technique [0002] Electron emission sources are the core components of vacuum electronic devices such as microwave tubes, X-ray tubes, electronic propulsion and charge control devices, and have important applications in communication, space technology, safety detection, medical imaging and other fields. The principle of field electron emission is to suppress the emission surface potential barrier through an external strong electric field, so that the height of the potential barrier is reduced and the width is narrowed, so that free electrons inside the object enter the vacuum through the tunnel effect. The field emission cathode does not require external energy, can achieve instantaneous start, and can theoretically reach a high current density, which is a cathode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/304H01J9/02H01J29/04
CPCH01J1/304H01J9/02H01J9/025H01J29/04
Inventor 洪序达梁栋石伟
Owner SHENZHEN INST OF ADVANCED TECH
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