Preparation method of ultra-long few-walled carbon nanotube array

Abstract

The invention belongs to the technical field of carbon material preparation. The invention relates to a preparation method of a carbon nanotube array, in particular to a preparation method of a super-long few-walled carbon nanotube array. According to the method, a lamellar material is used as a carrier, wherein the size and the distribution density of active particles of the catalyst are regulated and controlled through a stoichiometric ratio; cheap carbon-containing gas or liquid is used as a carbon source; a catalyst is loaded by a container, and sulfur element is introduced, so that the contact surface between the catalyst and the carbon source gas is fully enlarged, the growth space of the carbon tubes is enlarged, and the few-wall super-long carbon nanotube array is prepared; the growth rate is more than 10 times of the ratio of the mass of the grown carbon nanotubes to the mass of the used catalyst, the length can reach more than 200 microns, and the Raman IG/ID value is not less than 3.0. The preparation method is simple and efficient, low in raw material cost, high in product purity and excellent in graphitization degree, industrial production can be achieved by carrying large equipment such as an industrial rotary furnace, a fluidized bed and a moving bed, and the preparation method has great significance in promoting industrial production and application of high-quality carbon nanotubes.

Description

Technical field: [0001] The invention belongs to the field of carbon material preparation technology and application technology, and in particular relates to a preparation method of an ultra-long few-wall carbon nanotube array. Background technique: [0002] Carbon nanotubes are a typical one-dimensional nanomaterial among many nanomaterials, and have received extensive attention and in-depth research since their discovery. Structurally, carbon nanotubes can be regarded as a seamless tube structure formed by curling one-dimensional graphite layers. According to the number of curled graphite layers, carbon nanotubes can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes. Among them, those with a graphite layer of about 2 to 7 layers are also called few-walled carbon nanotubes. Single-walled or few-walled carbon nanotubes have better physical and chemical properties than multi-walled tubes due to their high specific surface area and low defect de...

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Problems solved by technology

In the above work, the length of the prepared carbon nanotubes is usually about 10 μm, and it is difficult to achieve the preparation of long array carbon nanotubes above 100 μm. At the same time, most of the grown multi-walled tubes

In the patent CN 101665248A, although it can prepare single and double-walled carbon nanotubes, its growth rate is very low, and the catalyst content in the product is very high, which requires a cumbersome purification process

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