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A method for improving field emission properties of flexible composites of graphene sheets and carbon nanotube films

A carbon nanotube film and carbon nanotube film technology are applied in the field of preparation and application of nanomaterials to achieve the effects of reducing the work function, increasing the maximum field emission current density and enhancing the binding force.

Inactive Publication Date: 2018-12-11
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In our previous work, we have realized the morphology-controlled preparation of graphene sheets on flexible carbon nanotube films (existing technology: Chinese patent, patent number ZL201510681497.2), but the minimum turn-on field of the obtained material is still as high as 1.78V / μm, the maximum field emission current density is only 7.10mA / cm 2 , there is still a huge room for improvement in terms of reducing the working electric field, increasing the field emission current density, and realizing stable work under high field emission current density. The performance of field emission cathodes puts new demands on

Method used

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  • A method for improving field emission properties of flexible composites of graphene sheets and carbon nanotube films
  • A method for improving field emission properties of flexible composites of graphene sheets and carbon nanotube films
  • A method for improving field emission properties of flexible composites of graphene sheets and carbon nanotube films

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Experimental program
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Effect test

Embodiment 1

[0028] (1) Pretreatment of carbon nanotube film:

[0029] The commercially available flexible carbon nanotube film ( figure 2 a: The optical picture of the original carbon nanotube film) was cut into 2cm×2cm pieces, and then it was bombarded with energy-carrying silver ions using a metal vapor vacuum arc ion source (MEVVA source). The bench bias was set to -10kV, the beam current was 5 mA, and the bombardment time was 10 minutes.

[0030] (2) Preparation of graphene sheet by microwave plasma enhanced chemical vapor deposition method:

[0031] The silver ion bombarded carbon nanotube film that step (1) obtains is placed on image 3 On the graphite sample stage in the shown microwave plasma system, vacuum the reaction chamber to 1.0 × 10 -3 Pass into 15sccm hydrogen after Pa, adjust the air pressure to 1kPa, heat the sample stage with a heater until the temperature is stable to 750 degrees Celsius, start the microwave source, adjust the microwave power to 200W, and feed 3 sc...

Embodiment 2

[0039] (1) Pretreatment of carbon nanotube film:

[0040] First cut the commercially available flexible carbon nanotube film into 2cm×2cm pieces, and then use metal vapor vacuum arc ion source (MEVVA source) to bombard it with energy-carrying silver ions. During the bombardment, keep the sample stage rotating at a constant speed, The bias voltage was set at -10 kV, the beam current was 5 mA, and the bombardment time was 10 minutes.

[0041] (2) Preparation of graphene sheet by microwave plasma enhanced chemical vapor deposition method:

[0042] Place the silver ion-bombarded carbon nanotube film obtained in step (1) on the graphite sample stage in the microwave plasma system, and vacuum the reaction chamber to 1.0×10 -3 Pass into 15sccm hydrogen after Pa, adjust the air pressure to 1kPa, heat the sample stage with a heater until the temperature is stable to 750 degrees Celsius, start the microwave source, adjust the microwave power to 200W, and feed 3 sccm of acetylene gas, a...

Embodiment 3

[0050] (1) Pretreatment of carbon nanotube film:

[0051] First cut the commercially available flexible carbon nanotube film into 2cm×2cm pieces, and then use metal vapor vacuum arc ion source (MEVVA source) to bombard it with energy-carrying silver ions. During the bombardment, keep the sample stage rotating at a constant speed, The bias voltage was set at -10 kV, the beam current was 5 mA, and the bombardment time was 10 minutes.

[0052] (2) Preparation of graphene sheet by microwave plasma enhanced chemical vapor deposition method:

[0053] Place the silver ion-bombarded carbon nanotube film obtained in step (1) on the graphite sample stage in the microwave plasma system, and vacuum the reaction chamber to 1.0×10 -3 Pass into 15sccm hydrogen after Pa, adjust the air pressure to 1kPa, heat the sample stage with a heater until the temperature is stable to 750 degrees Celsius, start the microwave source, adjust the microwave power to 200W, and feed 3 sccm of acetylene gas, a...

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Abstract

The invention discloses a method of improving a field emission performance of a graphene sheet -carbon nanotube film flexible composite material, belonging to the field of preparation and applicationof nanomaterials. The method comprises the following preparation processes: (1) pretreatment of energetic silver ion bombardment on carbon nanotube film; (2) Preparation of thin graphene sheets on carbon nanotube films by microwave plasma enhanced chemical vapor deposition; (3) the obtained graphene sheets were modified at room temperature, and Carbon nanotube films were treated with nitrogen andhydrogen plasma. (4) Nitrogen-doped graphene sheets-Carbon nanotube films were annealed at high temperature. Compared with the prior art, the nitrogen-doped graphene sheet prepared by the method has the advantages that: Flexible carbon nanotube film composites have low working electric field, high current density and good field emission stability under high current density, so they have high application value.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of nanomaterials, and specifically relates to a method for preparing nitrogen-doped graphene sheets-carbon nanotube film flexible composite materials by plasma treatment and for improving field emission performance. Background technique [0002] Field emission refers to the process of electrons inside the cathode material escaping from the surface of the material into the vacuum under the action of an externally enhanced electric field. Excellent field emission performance generally requires the cathode to have a low working electric field, a large current density and good stability. sex. Since graphene was discovered in 2004, its excellent electrical properties and unique two-dimensional structure have shown good application prospects in many aspects, including its application in the development of vacuum field electron emission devices. Compared with the traditional carbon n...

Claims

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Application Information

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IPC IPC(8): H01J9/02H01J1/304B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01J1/304H01J9/025H01J2201/30403H01J2201/30434H01J2201/30461H01J2201/30469H01J2209/0223
Inventor 邓建华索宁田燕
Owner TIANJIN NORMAL UNIVERSITY
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