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Metal catalyst for low-temp. thermochemical gas-phase precipitation synthesis of carbon nanotubes and synthetic method of carbon nanotubes using the same

A chemical vapor deposition, metal-loaded technology, applied in gaseous chemical plating, metal material coating process, coating and other directions, can solve the problem of no obvious progress in the catalyst system, and achieve the effect of complete compatibility and cost reduction.

Inactive Publication Date: 2003-10-15
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the technology in the previous proposal is to improve the process patent of EP1061041 A1. The main progress is to change the two-stage heating system to a one-stage heating system. However, there is no obvious progress for the catalyst system, and it still needs to be processed on two substrates. Two different catalytic systems are used on

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1 gram of silver particles with a particle size distribution between 1-5 microns was added to 50 ml of water, followed by ultrasonic treatment of the solution for 10 minutes. 1 g of an aqueous solution of nickel nitrate at a concentration of 1% was added to the obtained silver aqueous solution, and stirred to mix. The obtained mixture was then heated to remove the solvent therein to obtain 1.01 g of a semi-finished product containing 1% nickel metal as a silver-supported catalyst.

Embodiment 2

[0046] Take 1.0 g of silver particle powder with a particle size distribution between 0.05-0.1 micron, add 50 ml of deionized water and stir for 15 minutes, then add 0.05 g of ammonia water with a concentration of 28% and stir for 5 minutes, then heat and reflux for 30 minutes, and then slowly add Add 0.5 g of nickel nitrate aqueous solution with a concentration of 10%, add 0.08 g of ammonia water with a concentration of 28%, continue stirring and boiling for 4 hours, then add 0.44 g of a 37% formaldehyde solution, and boil for another 30 minutes. After cooling, filter and take the filter cake and dry it at 110° C. for 4 hours to obtain 1.05 g of silver-supported catalyst containing 5% nickel metal.

Embodiment 3

[0048] The loaded metal catalyst prepared in Example 1 was mixed evenly with the polymer glue, and the mixing ratio (weight) of the loaded metal catalyst to the polymer glue was 1:1. A suitable polymer glue solution comprises a cellulose resin (Cellulose resin) 35wt%, dl-1-p-alpha-terpineol (dl-α-terpineol) 50wt% as a solvent, a phosphoric acid as a dispersant (dispersant) Sodium phosphate 10wt% and glass powder 15wt%. After the substrate coated with the catalyst glue solution was dried at 110°C for 30 minutes, it was placed in a thermal chemical vapor deposition reactor, and then the temperature in the reactor was raised to 500°C, and sintered in an air atmosphere for 30 minutes to remove polymers and solvents. Argon gas was introduced for 10 minutes at a flow rate of 1500ml / min, and the air was driven out of the reactor. Before starting the reaction, argon (500ml / min) and hydrogen (75ml / min) were mixed and passed into the system for 5 minutes, then acetylene (25ml / min) was...

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Abstract

The present invention relates to synthesis of carbon nanotubes, and is especially the loaded metal catalyst for low temperature thermochemical vapor deposition process of synthesizing carbon nanotubes. The loaded metal catalyst includes noble metal particles of 0.01-10 micron size and used as carrier and metal catalyst deposited on the noble metal particles. The metal catalyst may be Fe, Co, Nior their alloy and has weight ratio to the noble metal particles of 0.1-10 %. The present invention also reveals the method of low temperature synthesis process of carbon nanotubes directly on substrate with the loaded metal catalyst, with the catalyst carrier being not eliminated after synthesizing carbon nanotubes.

Description

technical field [0001] The present invention relates to a method for synthesizing carbon nanotubes, in particular to a supported metal catalyst suitable for synthesizing carbon nanotubes by low-temperature thermal chemical vapor deposition. Background technique [0002] Carbon nanotubes have very special properties, such as low density, high strength, high toughness, flexibility, high surface area, large surface curvature, high thermal conductivity, specific conductivity, etc., so they attract a lot of research work Researchers focus on developing its possible applications, such as composite materials, microelectronic components, flat-panel displays, wireless communications, fuel cells, and lithium-ion batteries, among others. Carbon nanotube field emission displays (CNT-FED) with carbon nanotubes as the electron emission source is a new type of flat panel display with great potential. Usually, the larger CNT-FED process is based on the purification and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C23C16/00
Inventor 黄建良丁傑江日舜
Owner IND TECH RES INST