Nano carbon tube based field emitting cathode and its preparing method

A field emission cathode and carbon nanotube technology, which is applied in cold cathode manufacturing, discharge tube/lamp manufacturing, electrode system manufacturing, etc., can solve the difficult and restrictive conditions of carbon tube growth, and can not control the quality of carbon tubes well and other issues, to achieve the effect of reducing production cost, improving performance, and increasing field enhancement factor

Inactive Publication Date: 2006-03-08
PEKING UNIV
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  • Application Information

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Problems solved by technology

It is an effective method to directly grow vertical carbon nanotube films on the cathode plane, but since the growth of carbon tubes requires high temperature and chemical reactions and other conditions, on the one hand, direct growth puts forward additional requirements on the cathode material itself, and on the other hand, it also limits The conditions for the growth of carbon tubes, so the quality of carbon tubes cannot be well controlled
Assembling the prepared carbon tubes on the cathode plate is currently not easy to achieve a vertically arranged carbon tube array with good contact with the electrode and good field electron emission performance.

Method used

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  • Nano carbon tube based field emitting cathode and its preparing method
  • Nano carbon tube based field emitting cathode and its preparing method
  • Nano carbon tube based field emitting cathode and its preparing method

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Embodiment Construction

[0025] The carbon nanotubes of the present invention are arranged on the field emission cathode plate in a flat manner. The interior of the carbon nanotube of the present invention is filled with metal or metal oxide particles, and the filled particles make the outer wall of the carbon nanotube form a plurality of geometric protrusions. Wherein, carbon nanotubes can be prepared by the following steps:

[0026] (1) Select the metal catalyst according to the target filler, and prepare a mixed solution for generating the metal catalyst / carrier;

[0027] (2) prepare a thin film on the substrate with the solution prepared in step (1);

[0028] (3) heat-treating the substrate covered with the film in the air or in an environment with oxygen to solidify the film on the substrate and form a metal catalyst / carrier composite film;

[0029] (4) Put the substrate covered with the metal catalyst / carrier composite thin film in a heating furnace to heat, the atmosphere is an inert gas or a...

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Abstract

Nano carbon tubes in mode of lain low are distributed on pole plate of field-emissive cathode. The preparation includes following steps: putting Nano carbon tubes to alcohol or other solvent, and mixing it round to prepare solution; dropping the solution obtained to the said pole plate of cathode; air drying the said solution on the pole plate naturally. Advantages are: simplifying technique, lowering cost, raising performance, and avoiding difficulty of arranging Nano carbon tubes vertically.

Description

technical field [0001] The invention relates to a field emission cathode based on carbon nanotubes and a preparation method thereof. Background technique [0002] Using carbon nanotubes to prepare field emission cathodes and make flat panel displays is a promising technical field. Carbon nanotubes have a large aspect ratio, a small radius of curvature at the top, and a long working time for emitting electrons, so they are good basic materials for displays. The geometric shape of traditional carbon nanotubes is relatively regular, and the diameter distribution along the axis of the tube is relatively uniform. Therefore, the mechanism of the field electron emission is mainly the top emission, and the contribution from the side is small, and the effective use area of ​​the nanotube is not fully utilized. The use of carbon nanotubes to prepare field emission cathodes has always been using the top emission of carbon tubes [Walt A.de Heer et al, Science 270 (1995) 1179; Jean DIJ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/304H01J9/02
Inventor 彭练矛陈清车仁超
Owner PEKING UNIV
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