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Nano carbon pipe composite field-emission source and manufacturing method thereof

A technology of carbon nanotubes and emission sources, which is applied in the manufacture of discharge tubes/lamps, discharge tubes, cold cathodes, etc., can solve the problems of low resolution, poor uniformity of field emission, and low utilization of carbon nanotubes, and achieve The equipment and process are simple, the working voltage and energy consumption are reduced, and the effect is suitable for large-scale production

Active Publication Date: 2007-10-03
北京汉纳源纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Screen printing technology is simple and suitable for making large-area field emission cathodes; but there are also disadvantages such as poor uniformity of field emission, low resolution, low utilization of carbon nanotubes, and the need to activate them before they can be used.

Method used

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  • Nano carbon pipe composite field-emission source and manufacturing method thereof
  • Nano carbon pipe composite field-emission source and manufacturing method thereof
  • Nano carbon pipe composite field-emission source and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] In this embodiment, Fe-Al-Cr fiber woven cloth is used as the substrate, and the area of ​​Fe-Al-Cr woven cloth is 2×2cm 2 , Fe-Al-Cr fiber diameter is 1 μm. The steps of making a carbon nanotube composite field emission source on the substrate are as follows:

[0039] (1) Preparation of carbon nanotube organic growth solution: measure 50mL p-xylene C 8 h 10 , add 20 mg of ferrocene and 2 g of silicon oxide powder with an average particle diameter of about 2 mm.

[0040] (2) Sonochemical synthesis of carbon nanotubes (see FIG. 1 ): put the beaker containing the above-mentioned organic growth solution 102 into an ice bath, then insert an ultrasonic probe 101 for ultrasonic treatment—the ultrasonic frequency is 20 kHz, and the ultrasonic power is 300 W. The ultrasonic treatment time is 20 minutes; during the ultrasonic treatment process, the organic growth liquid 102 undergoes a sonochemical reaction, and carbon nanotubes are generated on the surface of the silicon oxi...

Embodiment 2

[0044] In this embodiment, carbon fiber woven cloth is used as the substrate, and the area of ​​carbon fiber woven cloth is 2×2cm 2 , with a carbon fiber diameter of 2 μm. The steps of making a carbon nanotube composite field emission source on the substrate are as follows:

[0045] (1) Ti film deposited by electron beam evaporation: a Ti film with a thickness of 20 nm was evaporated on the above-mentioned carbon fiber woven cloth by electron beam evaporation method to enhance the bonding force between carbon nanotubes and carbon fiber substrate.

[0046] (2) Preparation of carbon nanotube organic growth solution: Measure 50 mL of decane, add 2 mg of iron pentacarbonyl and 0.5 g of silicon oxide powder with an average particle diameter of about 3 mm.

[0047] (3) Sonochemical synthesis of carbon nanotubes (see Figure 1): Put the beaker containing the above-mentioned organic growth solution into an ice bath, and then insert an ultrasonic probe for ultrasonic treatment—ultrason...

Embodiment 3

[0051] The preparation steps are the same as in Example 2, using carbon fiber woven cloth as the substrate, and the area of ​​the carbon fiber woven cloth is 2×2cm 2 , with a carbon fiber diameter of 3 μm. The steps of making a carbon nanotube composite field emission source on the substrate are as follows:

[0052] (1) Electron beam evaporation of Mo film: a Mo film with a thickness of 5 nm was evaporated on the above-mentioned carbon fiber woven cloth by electron beam evaporation to enhance the bonding force between the carbon nanotubes and the carbon fiber substrate.

[0053] (2) Preparation of carbon nanotube organic growth solution: Measure 50 mL of decalin, add 4 mg of nickel tetracarbonyl, 0.5 g of silicon oxide powder with an average particle diameter of about 1 mm, and 0.1 mg of thiophene.

[0054](3) Sonochemical synthesis of carbon nanotubes (see Figure 1): put the beaker containing the above-mentioned organic growth solution into an ice bath, and then insert an ul...

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Abstract

The present invention relates to a nano carbon tube composite field emission source. It includes nano carbon tube membrane which is grown on the substrate and can be used as electronic field emission source. The described substrate is of conductive fibre braided rope or braided fabric, its fibre diameter range is 1-20 microns. The preparation method of said composite field emission source includes the following steps: under the condition of normal temperature and normal pressure utilizing phonochemical method to prepare nano carbon tube; adopting the processes of centrifugal separation, filtration, surface active ultrasonic dispersion, chemical corrosion, selective oxidation and ultrasonic etching, etc. to purify and shear nano carbon tube; then utilizing electrophoretic deposition process to make the purified and sheared nano carbon tube be firmly deposited on the conductive fibre braided rope or braided fabric so as to form the invented nano carbon tube composite field emission source.

Description

technical field [0001] The present invention relates to a composite field emission source of carbon nanotubes and a preparation method thereof, in particular to preparing carbon nanotubes by using a sonochemical method under normal temperature and pressure conditions, and depositing the prepared carbon nanotubes on the surface by electrophoretic deposition A method for making a carbon nanotube composite field emission source on a carbon fiber or metal (or alloy) fiber braid (cloth or rope) substrate. Background technique [0002] Because carbon nanotubes have excellent electrical conductivity, extremely high mechanical strength and chemical stability, and very high shape factor (ratio of length to radius), it becomes an ideal electron field emission material, so that in the new generation of field emission It occupies a prominent position in the development of lighting lamps, field emission displays (FEDs) and other microelectronic vacuum devices. [0003] Arc method, laser...

Claims

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Application Information

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IPC IPC(8): H01J1/304H01J29/04H01J9/02C01B31/02
Inventor 冯孙齐
Owner 北京汉纳源纳米科技有限公司
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