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Surface chemical metal plating carbon nanotube field-emission cathode preparation method

A technology of carbon nanotubes and field emission, which is applied in the manufacture of cold cathodes, discharge tubes/lamps, and electrode systems, etc. Poor adhesion between cathode, carbon nanotube film and substrate electrode, etc., to achieve good electron conduction and emission capabilities, increased probability, and high uniformity of luminescence

Active Publication Date: 2010-03-03
FUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these methods still have some problems, such as more or less defects on the surface of carbon nanotubes, carbon nanotubes are easily surrounded by organic slurry, and the conductivity and field emission performance are not as good as those of directly grown carbon nanotube films. and the method of screen printing and spin (spray) coating is difficult to form a finely patterned carbon nanotube cathode, and the adhesion of the electrophoretic deposited carbon nanotube film to the substrate electrode is poor, etc.

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  • Surface chemical metal plating carbon nanotube field-emission cathode preparation method
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  • Surface chemical metal plating carbon nanotube field-emission cathode preparation method

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preparation example Construction

[0039] (3) Preparation of modified carbon nanotube electrophoretic fluid:

[0040] First prepare viscous organic slurry F1, then add the carbon nanotube powder with electroless metal plating on the surface obtained in step (2) to the organic slurry F1 to disperse into carbon nanotube slurry F2, and finally take the carbon nanotube Slurry F2 is added to the electrophoretic solvent, and metal ions are added to assist the ultrasonic dispersion of salts to make carbon nanotube electrophoretic fluid F3:

[0041] The concrete process of preparing the organic slurry F1 with viscousness among the present invention is to get ethyl cellulose ([C 6 h 7 o 2 (OC 2 h 5 ) 3 ] n ) 10-20g, terpineol (C 10 h 18 O) 300-500mL, 0-3g of polyvinylpyrrolidone, mixed together, the temperature is 60-120 ℃, through one or two or more combinations of magnetic stirring, heating stirring, ultrasonic dispersion or ultrasonic cell crushing After 2-24 hours, various materials are uniformly mixed, and...

Embodiment 1

[0053] The invention provides a method for preparing a field emission cathode with chemically plated metal silver carbon nanotubes on the surface. The process steps of the present invention will be described below in conjunction with the accompanying drawings.

[0054] 1. Activation treatment of carbon nanotubes:

[0055] (1) The principle diagram of carbon nanotube purification and cutting process is as follows figure 1 Shown: in beaker 102, add the original powder of carbon nanotube of 4g, the 98.3wt% concentrated sulfuric acid (H of 500mL 2 SO 4 ) and 65wt% concentrated nitric acid (HNO 3 ) with a volume ratio of 1:1 mixed solution, and it was placed in a water bath heating tank 103 at 100°C, and under the stirring of the glass stirring rod 104 of the stirrer 101, it was treated for 3h, centrifuged and vacuum filtered carbon nanometer The tubes were washed repeatedly with deionized water until the pH value was neutral, and finally the purified and chopped carbon nanotub...

Embodiment 2

[0075] The invention discloses a method for preparing a field emission cathode with electroless metal-plated nickel carbon nanotubes on the surface. The process steps of the present invention will be described below in conjunction with the accompanying drawings.

[0076] 1. Activation treatment of carbon nanotubes:

[0077] (1) The principle diagram of carbon nanotube purification and cutting process is as follows figure 1 Shown: in beaker 102, add the original powder of carbon nanotube of 4g, the 98.3wt% concentrated sulfuric acid (H of 500mL 2 SO 4 ) and 65wt% concentrated nitric acid (HNO 3) with a volume ratio of 1:3 mixed solution, and placed it in a water bath heating tank 103 at 100° C., while being stirred by the glass stirring rod 104 of the stirrer 101, treated for 3 h, centrifuged and vacuum filtered the carbon nano The tubes were washed repeatedly with deionized water until the pH value was neutral, and finally the purified and chopped carbon nanotubes were dri...

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Abstract

The invention provides a surface chemical metal plating carbon nanotube field-emission cathode preparation method, which belongs to a carbon nanotube field emission cathode technology, solves the shortcomings of the existing technology, improves the electronic conduction and emission capabilities of the carbon nanotube and enhances the contact between a carbon nanotube film and a substrate electrode. The preparation method comprises the following steps: the carbon nanotube is processed through purification, cutting, scattering, and then through sensitization and activation, the carbon nanotubesurface forms a noble metal catalytic center; then the carbon nanotube surface forms a metal layer through a chemical plating method, the surface chemical metal plating carbon nanotube is prepared into evenly and stably dispersed carbon nanotube electrophoresis liquid, and finally pulse electrophoresis deposition is used for preparing the cathode of the carbon nanotube. The surface chemical metalplating carbon nanotube has good electronic conduction and emission capabilities, the carbon nanotube field-emission cathode and a substrate electrode can form good attachment, and the invention canrealize large-area, imaging and uniform preparation for the carbon nanotube field-emission cathode.

Description

technical field [0001] The invention belongs to a carbon nanotube field emission cathode, and more specifically relates to a preparation method of a carbon nanotube field emission cathode with electroless metal plating on the surface. Background technique [0002] Carbon nanotubes have large specific surface area, high aspect ratio (>1000), excellent mechanical properties, and good chemical stability, etc., due to their nanoscale tip curvature radius and low work function , showing good field emission characteristics, is currently the most ideal quasi-one-dimensional nanomaterial to replace the metal-tipped cold cathode emission material. However, the highly graphitized structure makes the surface reactivity of carbon nanotubes very low, the carbon nanotubes themselves are easy to agglomerate, the surface has weak hydrophilicity, low chemical activity, poor wettability with metal or resin matrix, and weak binding force. The superior performance of nanotubes as nanomateri...

Claims

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Application Information

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IPC IPC(8): H01J9/02
Inventor 叶芸游玉香张永爱汤巧治郭太良
Owner FUZHOU UNIV
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