Carbon nanotube fiber array cold cathode preparation method

Abstract

The invention provides a carbon nanotube fiber array cold cathode preparation method. The method includes the steps that a super-long orientation carbon nanotube is composited on a silicone substrate provided with a plurality of layers of metal catalysts in a deposition mode through a chemical vapor deposition method, and laddering and spinning are conducted on the composited carbon nanotube through a spinning method to continuously prepare orientation carbon nanotube fibers; then, microhole arrays are prepared in a conductive substrate in an etching mode or a laser boring mode, the spinning carbon nanotube fibers are implanted into the microhole arrays, and the length of the fibers is clipped according to the proper requirement; next, metal nanometer powder or metal micrometer powder is prepared into slurry, microholes in the conductive substrate are filled with the slurry in a microhole grouting mode, and then the conductive substrate is placed in a vacuum furnace; finally, annealing treatment is conducted on the conductive substrate at the temperature ranging from 400 DEG C to 900 DEG C under the protection of inert gases, or hydrogen reduction annealing treatment is conducted in the hydrogen atmosphere, or laser ablation is conducted under the protection of the inert gases, and the conductive substrate generated after the annealing treatment or the laser ablation treatment is conducted is the carbon nanotube fiber array cold cathode.

Description

technical field [0001] The invention relates to a carbon nanotube cathode material, in particular to a method for preparing a carbon nanotube fiber array cold cathode. Background technique [0002] Carbon nanotubes have good electrical conductivity, large aspect ratio, good mechanical strength, high chemical stability and low work function. The response time of the field emission cathode to the control signal reaches the nanosecond level, which can realize fast Pulse imaging, good directionality of electron emission, low energy divergence (0.2-0.3eV), long life, making it a very good cold cathode field emission material. At present, the field emission properties of carbon nanotubes have been used in many applications, for example, diodes and triodes of carbon nanotube cathodes, prototypes have been produced based on screen-printed carbon nanotube cathode flat panel displays, and carbon nanotubes prepared by CVD Cathode TWTs have also been produced. [0003] When utilizing ...

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Problems solved by technology

[0004] Although people have made a series of research results using carbon nanotube field emission cathode materials, however, due to the random distribution of carbon nanotubes, the performance of the obtained bulk material is much lower than that of a single carbon nanotube. more and more urgent

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