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Method for preparing magnetic metal particle modified carbon nanotube

A technology of carbon nanotubes and magnetic metals, which is applied in the field of preparation of carbon nanotubes modified by magnetic metal particles, can solve the problems of reducing material properties and destroying carbon tube structures

Inactive Publication Date: 2010-01-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to form active sites (such as various oxygen-containing functional groups) on the surface of carbon nanotubes, post-treatment methods usually use strong acids such as concentrated sulfuric acid (nitric acid, etc.) to treat carbon nanotubes at 120 ° C for a long time, which will destroy the structure of carbon nanotubes. Serious, greatly reducing the material performance, thus limiting its wide application in the fields of composite materials, energy storage materials and catalyst supports

Method used

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  • Method for preparing magnetic metal particle modified carbon nanotube
  • Method for preparing magnetic metal particle modified carbon nanotube
  • Method for preparing magnetic metal particle modified carbon nanotube

Examples

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Embodiment 1

[0021] The hydrogen flow rate of the carrier gas is 1.6cm / s, weigh 5 grams of the mixture of ferrocene and sulfur powder, wherein the weight ratio of ferrocene and sulfur powder is 100:1, the volatilization temperature is 200°C, and the reaction zone temperature is 1100°C , the heating rate is 20°C / min, and the temperature is kept for 5 minutes, and the final product is black powder.

[0022] scanning( figure 1 ) and transmission electron microscopy ( figure 2 ) and magnetic analysis ( image 3 ) showed that the product was carbon nanotubes decorated with magnetic iron particles. In the present embodiment, the outer diameter of the carbon nanotube is 50-120nm, the inner diameter is 20-60nm, and the average diameter of the iron particles is ~ 10nm; the product is subjected to thermal analysis in air ( Figure 4 ) indicated that the content of metal particles in the product was ~32 wt%.

Embodiment 2

[0024] The carrier gas argon flow rate is 1.6cm / s, weigh 5 grams of the mixture of ferrocene and sulfur powder, wherein the weight ratio of ferrocene and sulfur powder is 100:1, the volatilization temperature is 250 °C, and the reaction zone temperature is 1100 °C, the heating rate is 30 °C / min, and the temperature is kept for 5 min, and the final product is in the form of black powder.

[0025] Scanning and transmission electron microscopy and magnetic analysis show that the product is carbon nanotubes decorated with magnetic iron particles. In this embodiment, the outer diameter of carbon nanotubes is 70-160nm, the inner diameter is 40-90nm, and the average diameter of iron particles is ~5nm; thermal analysis shows that the content of metal particles in the product is ~30wt%.

Embodiment 3

[0027] The flow rate of the carrier gas argon is 1.6cm / s, weigh 5 grams of the mixture of ferrocene and sulfur powder, wherein the weight ratio of ferrocene and sulfur powder is 50:1, the volatilization temperature is 150°C, and the reaction zone temperature is 900°C °C, the heating rate is 40 °C / min, and the heat preservation is 5 min, and the final product is black powder.

[0028] Scanning and transmission electron microscopy and magnetic analysis show that the product is carbon nanotubes decorated with magnetic iron particles. In this example, the outer diameter of the carbon nanotubes is 90-200nm, the inner diameter is 30-110nm, and the average diameter of the iron particles is ~45nm; thermal analysis shows that the content of the metal particles in the product is ~40wt%.

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Abstract

The invention relates to a carbon nanotube preparation technique, in particular to a method for preparing a magnetic metal (iron, cobalt or nickel) particle modified carbon nanotube. The method comprises the following steps: adopting organo-metallic compounds as a carbon source and a catalyst and simultaneously as precursors of the carbon source and the catalyst, wherein the organo-metallic compounds are compounds of organic iron, cobalt or nickel; sublimating the organo-metallic compound catalyst and sufficiently and evenly mixing the organo-metallic compound catalyst with a sulfur-bearing growth promoter in a gaseous state; and putting the mixture into a reaction area to generate the magnetic metal particle modified carbon nanotube under the entrainment of buffer gas, wherein the mol ratio of sulfur to the iron (cobalt or nickel) in the organo-metallic compound is between 0 and 1 / 4. By controlling the sublimation temperature of the organo-metallic compound and the concentration of sulfur atoms in the reaction area, the method achieves the growth of the magnetic metal particle modified carbon nanotube and can control the diameter of the magnetic metal (iron, cobalt or nickel) particle.

Description

Technical field: [0001] The invention relates to a preparation technology of carbon nanotubes, in particular to a preparation method of magnetic metal particle-modified carbon nanotubes. Background technique: [0002] Carbon nanotubes have a unique one-dimensional nanostructure and many excellent properties, and have always been the frontier and hotspot of research in the fields of physical chemistry and materials science at home and abroad. After the surface modification of carbon nanotubes, its performance in some aspects is more prominent, or it has properties that it did not have originally, so that it can meet the requirements of various applications, which is of great significance for expanding the application field of carbon nanotubes. For example, oxygen-containing functional groups are introduced on the surface of carbon nanotubes to form active sites, and metal particles such as Fe, Co, and Ni are evenly placed on the active sites on the surface of carbon nanotubes...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 成会明刘庆丰任文才李峰丛洪涛
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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