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A method for enhancing the field emission performance of carbon nanotube array-carbon nanotube film flexible composites

A carbon nanotube array and carbon nanotube film technology, applied in the field of preparation and application of nanomaterials, can solve the problems of low field emission current density, large number of field emission points, poor stability, etc., and achieve enhanced tube-base bonding. , The effect of field electron emission enhancement and bonding force enhancement

Inactive Publication Date: 2020-04-28
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems that the existing carbon nanotube-based field emission cathodes are mostly based on hard materials, the working electric field is relatively high, the field emission current density is small, and the stability is not good during field electron emission with high current density. Insufficient, using silver ion bombardment pretreatment and microwave nitrogen, hydrogen plasma treatment, obtain nitrogen-doped carbon nanotube array-carbon nanotube film flexible composite material with low work function and large number of field emission points, and finally obtain a kind of Field emission cathode materials with flexibility, ultra-low working electric field, ultra-large field emission current density and good field emission stability at high current density

Method used

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  • A method for enhancing the field emission performance of carbon nanotube array-carbon nanotube film flexible composites
  • A method for enhancing the field emission performance of carbon nanotube array-carbon nanotube film flexible composites
  • A method for enhancing the field emission performance of carbon nanotube array-carbon nanotube film flexible composites

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Effect test

Embodiment 1

[0026] (1) Pretreatment of carbon nanotube film and deposition catalyst:

[0027] First cut the commercially available carbon nanotube film (Fig. 21: the optical picture of the original carbon nanotube film; Fig. 22: the low-magnification scanning electron microscope picture of the original carbon nanotube film) into small pieces of 2cm × 2cm, and then use metal vapor vacuum arc The ion source (MEVVA source) carried out energy-carrying silver ion bombardment treatment on it, and during the bombardment, the sample stage was kept rotating at a constant speed, the sample stage bias voltage was set to -10kV, the beam current was 5 mA, and the bombardment time was 10 minutes; then, The target of the MEVVA source was replaced with a high-purity iron target, and the iron catalyst was deposited on the carbon nanotube film bombarded by silver ions. During the deposition, the sample stage was kept rotating at a constant speed, the sample stage bias was set to -200V, and the beam current ...

Embodiment 2

[0035] (1) Pretreatment of carbon nanotube film and deposition catalyst:

[0036] First cut the commercially available carbon nanotube film into small pieces of 2cm×2cm, and then use metal vapor vacuum arc ion source (MEVVA source) to bombard it with energy-carrying silver ions. The voltage was set to -10kV, the beam current was 5 mA, and the bombardment time was 10 minutes; then, the target of the MEVVA source was replaced with a high-purity iron target, and the iron catalyst was deposited on the carbon nanotube film bombarded by silver ions. , keeping the sample stage rotating at a constant speed, the sample stage bias voltage was set to -200V, the beam current was 5 mA, and the deposition time was 100 seconds.

[0037] (2) Preparation of carbon nanotube arrays by thermal chemical vapor deposition and high temperature annealing treatment:

[0038] Put the carbon nanotube film deposited with iron catalyst obtained in step (1) into a high-temperature quartz tube furnace to pr...

Embodiment 3

[0044] (1) Pretreatment of carbon nanotube film and deposition catalyst:

[0045] First cut the commercially available carbon nanotube film into small pieces of 2cm×2cm, and then use metal vapor vacuum arc ion source (MEVVA source) to bombard it with energy-carrying silver ions. The voltage was set to -10kV, the beam current was 5 mA, and the bombardment time was 10 minutes; then, the target of the MEVVA source was replaced with a high-purity iron target, and the iron catalyst was deposited on the carbon nanotube film bombarded by silver ions. , keeping the sample stage rotating at a constant speed, the sample stage bias voltage was set to -200V, the beam current was 5 mA, and the deposition time was 100 seconds.

[0046] (2) Preparation of carbon nanotube arrays by thermal chemical vapor deposition and high temperature annealing treatment:

[0047] Put the carbon nanotube film deposited with iron catalyst obtained in step (1) into a high-temperature quartz tube furnace to pr...

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Abstract

The invention discloses a method for improving a field emission performance of a carbon nanotube array- carbon nanotube film flexible composite material, belonging to the field of preparation and application of nanomaterials. The method comprises the following preparation processes: (1) pretreatment of energetic silver ion bombardment on carbon nanotube film; (2) Carbon nanotube arrays were prepared by conventional thermochemical vapor deposition and annealed at high temperature; (3) Carbon nanotube arrays were treated with nitrogen and hydrogen plasma at room temperature in microwave plasmasystem. Compared with the prior art, the nitrogen-doped carbon nanotube array prepared by the method has the advantages that: Flexible carbon nanotube film composites have very low working electric field and very high field emission current density, and excellent field emission stability at high field emission current density, so they have very high application value.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of nanomaterials, and in particular relates to a method for preparing a nitrogen-doped carbon nanotube array-carbon nanotube film flexible composite material by plasma treatment and improving field electron emission performance. Background technique [0002] As a quasi-one-dimensional nanomaterial, carbon nanotubes have good electrical conductivity, mechanical strength and high chemical inertness. They have shown good application prospects in many fields such as energy storage, transistors, material composite enhancements, and detectors. . At the same time, the extremely large aspect ratio of carbon nanotubes also makes it an ideal field emission cathode material, showing good application potential in the development of vacuum field electronic devices. Field emission refers to the process of electrons inside the cathode material escaping from the surface of the material into t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/02H01J1/304B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01J1/304H01J9/025
Inventor 邓建华田燕索宁
Owner TIANJIN NORMAL UNIVERSITY
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