Method for synthesizing non-metal catalyst self-organizing growth carbon nano-tube with chemical vapor deposition

Abstract

The invention discloses a method for synthesizing a metal free catalyst self-assembled growing carbon nano-tube by chemical vapor deposition. The invention is characterized by firstly raising the temperature of a horizontal vacuum tube high temperature furnace into 940 to 980 DEG C and preserving the temperature under the protection of carries gases, then pumping the mixed gas of carbon source gas and the carries gases; the decomposing product of the carbon source gas is deposited on an underlay in the low temperature area of the high temperature furnace to form the self-assembled growing carbon nano-tube; the carbon source gas is gaseous compound containing carbon. The carrier gases are the mixed gas of one or two or a plurality of nitrogen, hydrogen or argon. As no metal catalysts are used, the carbon nano-tube prepared by the invention contains no metal catalysts, thus having the advantages of high output purity, low manufacture cost and being hopeful to realize continuous manufacture.

Description

technical field [0001] The invention relates to a method for synthesizing self-organized carbon nanotubes by chemical vapor deposition under the condition of no metal catalyst. Background technique [0002] As one of the most potential materials in nanomaterials, carbon nanotubes have received extensive attention in the research of their preparation technology. At present, the preparation methods of carbon nanotubes mainly include arc discharge method, laser evaporation method, and catalyst-assisted chemical vapor deposition method. High, complicated equipment, many impurities in the product, low yield and difficult to purify, not suitable for mass production; the quality of the product prepared by laser evaporation is high, but the yield is low; the catalyst-assisted chemical vapor deposition method is to use the free carbon produced by the cracking of hydrocarbons Ions, a method of forming carbon nanotubes by precipitation at one end of the catalyst. Compared with other m...

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Problems solved by technology

Purification of the product is currently the main means to remove the residual catalyst particles in carbon nanotubes and obtain pure carbon nanotubes. However, the purification process increases the production cost and the yield is low. At the same time, it may cause damage to the structure of carbon nanotubes or introduce new Impurities; the use of catalyst-free preparation technology is another way to obtain pure carbon nanotubes, such as: non-catalytic arc discharge method, non-catalytic flame method, thermal plasma sputtering and other technologies, but the characteristics of carbon nanotubes prepared by arc discharge method are The growth is fast, and the process parameters are easy to control, but the growth temperature is high, the equipment is complex, the product has many impurities, the yield is low, and it is difficult to purify, so it is not suitable for mass production; the product prepared by the flame method contains a large amount of by-products such as carbon particles, soot particles, and carbon nanofibers. , difficult to purify; thermal plasma sputtering technology equipment is complex, high production cost, not suitable for industrial production

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