Graphene field emission cathode and preparation method thereof

A technology for emitting cathode and graphene, applied in the field of field emission, can solve the problems of poor emission stability, low emission current density, large emission turn-on electric field, etc.

Pending Publication Date: 2020-05-08
SHENZHEN INST OF ADVANCED TECH
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Problems solved by technology

[0004] The object of the present invention is to provide a graphene field emission cathode and a manufacturing method thereof, aiming to solve the problems that the existing graphene field emission cathode has a large field emission opening electric field, a small emission current density, and poor emission stability

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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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[0033] The second aspect of the embodiments of the present invention provides a method for preparing a graphene field emission cathode, comprising the following steps:

[0034] S01. Provide a conductive substrate, prepare a graphene layer on a surface of the conductive substrate;

[0035] S02. Depositing metal nanoparticles on the surface of the graphene layer away from the conductive substrate, and vacuum annealing to prepare a graphene / nano-metal composite layer, wherein the work function of the metal nanoparticles is less than or equal to 4.5eV.

[0036] In the preparation method of the graphene field emission cathode provided by the embodiment of the present invention, metal nanoparticles with low work function are deposited on the surface of the graphene layer, and annealing treatment is further performed. During the annealing process, electronic interaction occurs between the graphene in the graphene layer and the nano-metal particles on its surface, and this electronic ...

Embodiment 1

[0053] A graphene field emission cathode, its preparation method is as follows:

[0054] Provide iron-based conductive substrate;

[0055] Prepare a 0.2mg / ml graphene solution, and ultrasonicate at 200W for 1 hour to form a stable dispersion. Wherein, the graphene in the graphene solution is multilayer graphene with a size of 1-3 microns. The graphene solution is drop-coated on the iron-based conductive substrate to deposit a graphene film, and dried at a temperature of 90° C. to form a graphene cathode;

[0056] Titanium nanoparticles with a thickness of 3nm are deposited on the surface of the graphene thin film away from the iron-based conductive substrate by magnetron sputtering, annealed at a temperature of 500°C for 30 minutes to prepare titanium metal nanoparticles doped graphene cathode.

Embodiment 2

[0058] A graphene field emission cathode, its preparation method is as follows:

[0059] Provide iron-based conductive substrate;

[0060] Prepare a 0.2mg / ml graphene solution, and ultrasonicate at 200W for 1 hour to form a stable dispersion. Wherein, the graphene in the graphene solution is multilayer graphene with a size of 1-3 microns. The graphene solution is drop-coated on the iron-based conductive substrate to deposit a graphene film, and dried at a temperature of 90° C. to form a graphene cathode.

[0061] Using the magnetron sputtering method to deposit bismuth nanoparticles with a thickness of 3 nm on the surface of the graphene film away from the iron-based conductive substrate, annealing at a temperature of 500 ° C for 30 minutes to prepare bismuth metal nanoparticles doped graphene cathode.

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Abstract

The invention provides a graphene field emission cathode, which comprises a conductive substrate and a graphene / nano-metal composite layer combined on one surface of the conductive substrate, whereinthe graphene / nano-metal composite layer comprises a graphene layer and a nano-metal material layer combined on the graphene layer, the nano-metal material layer is arranged on the surface, which deviates from the conductive substrate, of the graphene layer, the metal-nano material layer is composed of metal nanoparticles, and the work function of the metal nanoparticles is less than or equal to 4.5eV. By arranging the low-work-function metal nanoparticles on the surface of graphene, the starting electric field of the graphene cathode is remarkably reduced, the field emission current density isimproved, and the current emission stability of the graphene field emission cathode is improved.

Description

technical field [0001] The invention belongs to the technical field of field emission, in particular to a graphene field emission cathode and a manufacturing method thereof. Background technique [0002] Graphene is composed of a single layer of carbon atoms stacked into a periodic hexagonal lattice structure in a plane, and is a new type of two-dimensional carbon nanomaterial. Graphene has excellent electrical and thermal conductivity, stable chemical properties, and very high mechanical strength, and has important application prospects in materials science, micro-nano processing, energy, biomedicine, and drug delivery. In particular, graphene has abundant nanoscale edge structures, which can serve as efficient electron emission sites. Therefore, as an ideal field emission material, graphene is expected to be applied in vacuum microwave devices, field emission displays, X-ray sources and other fields. [0003] The preparation methods of graphene field emission cathode mai...

Claims

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Application Information

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IPC IPC(8): H01J1/304H01J9/02
CPCH01J1/304H01J9/025H01J2201/30453
Inventor 洪序达梁栋郑海荣
Owner SHENZHEN INST OF ADVANCED TECH
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