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Carbon nanometer tube negative electrode and method for preparing carbon nanometer tube negative electrode

A carbon nanotube cathode and carbon nanotube technology, which is applied in the field of field emission, can solve problems such as unsatisfactory adhesion improvement, reduced emission current density, and poor wettability of carbon nanotubes, achieving high emission current density and good stability , good effect on surface area

Inactive Publication Date: 2013-10-09
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former carbon nanotube tips are easily coated in the binder matrix, which greatly reduces the emission current density, while the latter has poor adhesion improvement effect due to the poor wettability of the carbon nanotubes and the binder layer.

Method used

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  • Carbon nanometer tube negative electrode and method for preparing carbon nanometer tube negative electrode

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Embodiment approach

[0026] Such as figure 1 As shown, the carbon nanotube cathode preparation method of the present application, an embodiment thereof, comprises the following steps:

[0027] Step 102: adding carbon nanotubes, graphene and charge additives into an organic solvent according to a predetermined ratio to obtain a mixed electrophoresis solution.

[0028] Wherein, the weight ratio of carbon nanotubes and graphene is 2-10, and in one embodiment, the weight ratio of carbon nanotubes and graphene is 3-6. The carbon nanotubes include at least one of single-wall carbon nanotubes, multi-wall carbon nanotubes, modified single-wall carbon nanotubes, and modified multi-wall carbon nanotubes. The carbon nanotubes have a length of 10 to 100 μm. In one embodiment, the carbon nanotubes preferably have a length of 10-20 μm. Graphene includes single-layer graphene and / or multi-layer graphene, that is, graphene may be single-layer graphene, multi-layer graphene or a mixture of single-layer graphene...

Embodiment 1

[0045] Add carbon nanotubes and graphene to absolute ethanol at a weight ratio of 2:1, and add 1% MgCl 2 (Based on the total weight of carbon nanotubes and graphene) as a charge additive, the concentration of carbon nanotubes and graphene is 1mg / ml, and ultrasonically dispersed for 12h to obtain a uniform mixed solution of carbon nanotubes and graphene; The silicon chip is used as the cathode, and the oxygen-free copper sheet is used as the anode, inserted into the electrophoresis solution, the distance between the cathode and the anode is 5cm, the DC electrophoresis voltage is 200V, and the electrophoresis time is 10s to obtain a composite film of carbon nanotubes and graphene; will be attached to the conductive substrate The composite film of carbon nanotubes and graphene was dried at 90 °C for 10 min, and then in N 2 Annealing at 800° C. for 1 h under a protective atmosphere to prepare a carbon nanotube / graphene composite film cathode.

Embodiment 2

[0047] Add carbon nanotubes and graphene to absolute ethanol at a weight ratio of 10:1, and add 50% MgSO 4 (Based on the total weight of carbon nanotubes and graphene) as charge additives, the concentration of carbon nanotubes and graphene is 0.01mg / ml, ultrasonically dispersed for 1h, to obtain a uniform mixed solution of carbon nanotubes and graphene; to print Ag The glass sheet of the electrode is used as the cathode, and the oxygen-free copper sheet is used as the anode, which is inserted into the electrophoresis solution. The carbon nanotube and graphene composite film on the conductive substrate was dried at 90° C. for 10 min, and then annealed at 600° C. for 1 h under an Ar protective atmosphere to prepare a carbon nanotube and graphene composite film cathode.

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Abstract

The invention discloses a method for preparing a carbon nanometer tube negative electrode. The method comprises the following steps that a carbon nanometer tube, graphene and electric charge additives are added into organic solvent according to a preset proportion to obtain a mixed electrophoresis solution; an electric conduction substrate is used as the negative electrode, a positive electrode and the negative electrode are placed inside the mixed electrophoresis solution, an electric field is additionally arranged, and the negative electrode deposits to obtain a composite film of the carbon nanometer tube and the graphene; annealing is carried out on the composite film to obtain the carbon nanometer negative tube. The invention further provides the carbon nanometer negative tube. Very strong van der waals force exists between the carbon nanometer tube and the graphene, and therefore the carbon nanometer tube is attracted to the graphene face or the side edge of the graphene through strong force and then deposits on the conduction substrate. By means of the huge superficial area of the graphene and the good electric conducting and heat conducting performance of the graphene, the carbon nanometer tube and the substrate are bond firmly in the composite film negative electrode of the carbon nanometer tube and the graphene, emission current density is large, and stability is good.

Description

technical field [0001] The present application relates to field emission technology, in particular to a method for preparing a carbon nanotube cathode and the carbon nanotube cathode. Background technique [0002] Carbon nanotube is a new type of carbon nanomaterial with excellent electrical conductivity, nanoscale tip, low work function and large field enhancement factor, etc. It is an ideal field emission material and has broad fields in the field emission field. application prospects. [0003] The preparation method of the carbon nanotube cathode includes an electrophoresis method, which is to disperse the carbon nanotubes and charge additives in an organic solvent, and then directly deposit them on the substrate under a direct current or alternating current electric field. The electrophoresis method has the advantages of simple and easy to control process, short preparation cycle, no organic pollution, etc., and can prepare a large area of ​​carbon nanotube cathode on a...

Claims

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Application Information

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IPC IPC(8): H01J9/02H01J1/304
Inventor 洪序达陈婷孙竹郑海荣
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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