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A kind of field emission cathode material, preparation method and application thereof

A field emission cathode and carbon fiber material technology, applied in cold cathode manufacturing, electrode system manufacturing, discharge tube/lamp manufacturing, etc., can solve the problems of high preparation temperature and complicated preparation process of field emission cathode materials, and achieve good mechanical properties and chemical stability, simple preparation process, low temperature effect

Active Publication Date: 2020-12-04
NORTHWEST UNIV
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Problems solved by technology

[0004] Aiming at the defects and deficiencies of the prior art, the purpose of the present invention is to provide a new field emission cathode material, preparation method and application thereof, which can prepare graphite-like phase carbon nitride flexible field emission cathode at a lower temperature to solve the problem of The existing field emission cathode materials have the problems of high preparation temperature and complicated preparation process

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  • A kind of field emission cathode material, preparation method and application thereof
  • A kind of field emission cathode material, preparation method and application thereof
  • A kind of field emission cathode material, preparation method and application thereof

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preparation example Construction

[0037] The flexible field emission cathode material of the present invention is prepared by reacting carbon fiber and urea solution at 450° C. to 600° C. to generate graphite-like carbon nitride on the surface of the carbon fiber, that is, the flexible field emission cathode material. Specifically, the preparation process includes:

[0038] First, arrange the carbon fibers in a mixture of acetone, ethanol and deionized water at a volume ratio of 1:1:1 for cleaning, and after drying, place them in urea solution for 30-60 minutes of ultrasonication;

[0039] Then, heat the solution to 450°C-600°C for 1-5 hours at a heating rate of 10-15°C / min, and cool naturally;

[0040] Finally, after washing and drying, the carbon fiber material with graphite-like carbon nitride grown on the surface can be obtained, that is, the flexible field emission cathode material.

[0041] Wherein, the urea solution is a saturated solution of urea, so as to avoid the influence of high-temperature pyrol...

Embodiment 1

[0045] Cut a carbon fiber cloth with a size of 1×1cm, put it into a mixture of acetone, ethanol and deionized water with a volume ratio of 1:1:1, and after ultrasonic cleaning, rinse with deionized water and absolute ethanol and dry; 15g Mix urea with 10ml of deionized water to prepare a saturated urea solution; add the cleaned and dried carbon fiber cloth into the saturated urea solution and ultrasonicate for 30 minutes; then transfer the carbon fiber cloth and the saturated urea solution to a 50ml crucible with a lid In the muffle furnace, heat up to 600°C at a rate of 15°C / min, keep it warm for 3 hours and then cool naturally; take out the sample, wash it with absolute ethanol and deionized water, and then dry it to obtain a graphite-like phase carbon nitride flexible field emission cathode material.

[0046] figure 1 For the SEM image enlarged 10000 times of the carbon fiber cloth substrate used in this embodiment, figure 2 The SEM image of the graphite-like phase carbo...

Embodiment 2

[0049] The difference between this embodiment and Embodiment 1 is that the heating temperature in this embodiment is 550° C., and the holding time is 1 h.

[0050] Figure 7 For the field emission J-E characteristic curve of the field emission cathode material prepared in this embodiment, it can be seen that its field emission opening electric field is 0.6V / μm (current density reaches 1μA / cm 2 electric field strength at the time).

[0051] Figure 8 It is the field emission F-N curve of the field emission cathode material obtained in this embodiment. It can be seen that the field emission F-N curve is approximately linear, indicating that the electron emission of this embodiment conforms to the field emission mechanism.

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Abstract

The invention discloses a flexible field emission cathode material, a preparation method and its application. The material includes a carbon fiber substrate and graphite-like phase carbon nitride grown on the carbon fiber substrate. The flexible field emission cathode material can be obtained by reacting carbon fiber and urea saturated solution as raw materials at 450°C to 600°C; the material can be used as a flexible field emission cathode in vacuum electronic devices. The graphite-like phase carbon nitride nanomaterial grown in the present invention is evenly and tightly coated on the carbon fiber. The graphite-like phase carbon nitride nanomaterial has a nanotube structure. The thickness of the lamellae of the structure is thin and has rich edges that can improve its field. emission factor, thereby effectively improving its field emission performance. The entire preparation process directly grows graphite-like carbon nitride on a flexible carbon fiber cloth substrate at 450°C to 600°C. The temperature is low, the preparation process is simple and efficient, and the cost of raw materials is low.

Description

technical field [0001] The invention belongs to the technical field of vacuum electronic devices, and in particular relates to a field emission cathode material, a preparation method and an application thereof. Background technique [0002] Flexible field emission cathodes are widely used in electronic fabrics, distributed sensors, paper displays, and large-scale curved displays on the surface of buildings due to their unique characteristics of deformability, bending, and the regulation of the resistivity and field emission performance of the cathode by stretching and bending. and other fields have broad development prospects. The most widely used typical flexible substrates are polymer, graphene and carbon fiber cloth. Among them, the cathode prepared with carbon fiber cloth as the substrate has high flexibility, and carbon fiber cloth has high stability at high temperature, and has been developed rapidly in recent years. [0003] Currently known flexible field emission c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/304H01J9/02
Inventor 赵佩佩翟春雪张志勇任晓瀛吕媛媛赵武赵丽丽
Owner NORTHWEST UNIV
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