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Method for directly growing carbon nano tube field emission cathode on metal substrate containing nickel

A field emission cathode and metal substrate technology, which is applied in cold cathode manufacturing, discharge tube/lamp manufacturing, electrode system manufacturing, etc., can solve problems affecting life and vacuum performance, accelerating CNT film aging, and reducing device conductivity. Achieve the effects of enhanced binding performance, improved mechanical properties, and improved stability

Active Publication Date: 2015-05-20
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, limited by the preparation process, the above two methods have some inherent defects caused by the surface binding characteristics:
[0006] 2) Multiple contacts between CNTs and transition metals or cured materials are sources of heat dissipation, which will not only reduce the electrical conductivity of the device, but energy dissipation will also increase the local temperature and accelerate the aging of the CNT film;
Under the impact of different thermal environments during long-term work, due to the difference in thermal expansion coefficient, the junction between the transition metal (cured material) and the substrate may be dislocated, causing the CNT film to fall off, affecting the life and vacuum performance

Method used

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  • Method for directly growing carbon nano tube field emission cathode on metal substrate containing nickel
  • Method for directly growing carbon nano tube field emission cathode on metal substrate containing nickel
  • Method for directly growing carbon nano tube field emission cathode on metal substrate containing nickel

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Embodiment 1

[0029] like figure 1 As shown, the method for directly growing carbon nanotube field emission cathodes on nickel-containing metal substrates in the CVD reaction device includes the following steps:

[0030] (1) The nickel-containing metal substrate is ultrasonically cleaned with alcohol, acetone, and deionized water. In this embodiment, the nickel-containing metal substrate is pure nickel;

[0031] (2) Anodize the nickel-containing metal substrate, select an acidic solution, use the nickel-containing metal substrate as the positive electrode, select a corrosion-resistant conductor (Pt) as the negative electrode, and apply a fixed voltage of 1V between the two electrodes for 0.1-10 minutes. After chemical treatment, chemically and ultrasonically clean the nickel-containing metal substrate with alcohol, acetone, deionized water;

[0032] (3) Set up the CVD reaction device, see figure 1 , and carry out the chemical vapor reaction growth of carbon nanotubes on the nickel-contain...

Embodiment 2

[0034] A method for directly growing carbon nanotube field emission cathodes on nickel-containing metal substrates in a CVD reaction device, comprising the following steps:

[0035] (1) The nickel-containing metal substrate is chemically cleaned with alcohol, acetone, deionized water, and ultrasonically. In this embodiment, the nickel-containing metal substrate is stainless steel;

[0036] (2) Anodize the nickel-containing metal substrate, choose an acidic solution, use the nickel-containing metal substrate as the positive electrode, choose a corrosion-resistant conductor (Pt) as the negative electrode, and apply a fixed voltage of 50V between the two electrodes for 0.1-10 minutes. After the chemical treatment, the nickel-containing metal substrate is ultrasonically cleaned with alcohol, acetone and deionized water;

[0037] (3) Set up the CVD reaction device, see figure 1 , and carry out the chemical vapor reaction growth of carbon nanotubes on the nickel-containing metal su...

Embodiment 3

[0039] A method for directly growing carbon nanotube field emission cathodes on nickel-containing metal substrates in a CVD reaction device, comprising the following steps:

[0040] (1) The nickel-containing metal substrate is chemically cleaned with alcohol, acetone, deionized water, and ultrasonically. In this embodiment, the nickel-containing metal substrate is Hastelloy;

[0041] (2) Anodize the nickel-containing metal substrate, select an acidic solution, use the nickel-containing metal substrate as the positive electrode, select a corrosion-resistant conductor (Pt) as the negative electrode, and apply a fixed voltage of 100V between the two electrodes for 0.1-10 minutes. After chemical treatment, chemically and ultrasonically clean the nickel-containing metal substrate with alcohol, acetone, deionized water;

[0042] (3) Set up the CVD reaction device, see figure 1 , and carry out the chemical vapor reaction growth of carbon nanotubes on the nickel-containing metal substr...

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Abstract

The invention discloses a method for directly growing a carbon nano tube field emission cathode on a metal substrate containing nickel. The method is characterized by including the steps of firstly, performing chemical and ultrasonic cleaning on the metal substrate containing nickel; secondly, anodizing the metal substrate containing nickel; thirdly, directly performing chemical gas-phase reaction growth of a carbon nano tube on the metal substrate containing nickel. The method has the advantages that under the process condition of the method, the CNT (carbon nano tube) directly grows from a metal body, the combining performance of the CNT and the substrate is enhanced, and the mechanical performance of the CNT is improved; experimental results indicate that the field emission performance of the carbon nano tube field emission cathode produced by the method is increased evidently.

Description

technical field [0001] The invention relates to a method for preparing carbon nanotubes, in particular to a method for directly growing carbon nanotube field emission cathodes on metal substrates. Background technique [0002] Due to the excellent and unique structure, physical, chemical and mechanical properties of carbon nanotubes (CNTs), carbon nanotube field emission cathodes have become the main research and development objects for field emission applications. Compared with other field emission sources, the emission threshold of carbon nanotube field emission cathode (emission 10mA / cm 2 The field strength of the current) can be as low as 1-2V / μm, a single CNT can emit a current of the order of μA, and the CNT film has the ability to generate a high current density. Carbon nanotube field emission cathodes have been widely studied and applied in vacuum electronic devices such as flat display, lighting, X-ray, and vacuum measurement. [0003] There are currently two comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/02
Inventor 董长昆翟莹王福全
Owner WENZHOU UNIVERSITY