Method and device for preparing continuous carbon nanometer tube fibers through CVD method

Abstract

The invention belongs to the technical field of nanometer material preparation, and particularly discloses a method and device for preparing continuous carbon nanometer tube fibers through a CVD method. A mixed solution of a carbon source, a catalyst, an accelerant and water is injected into a needle tube with multiple needle tips through a micro-injection pump, a motor controls the needle tube torotate, and then the mixed solution is injected into carrier gas flow, and driven by the gas flow to enter a quartz tube; the solution is gasified at first and then cracked into atoms, and afterwards, a cylindrical carbon nanometer tube film is formed in the quartz tube, then pulled out of the quartz tube, and subjected to rinsing compaction to obtain the continuous carbon nanometer tube fibers.According to the method and device for preparing the continuous carbon nanometer tube fibers, through flow division by multiple needle heads, the contact area between the reaction solution and the carrier gas can be increased, and thus the activity of the reactants is improved; through the rotation of the needle heads, a certain 'fan effect' can be generated, certain driving force is generated ongas in a furnace so that the reaction solution can more quickly reach a reaction area after being gasified, the generation of intermediate products is reduced, the prepared fibers are thin, the yieldis increased, and the carbon nanometer tube fibers can be produced in batches.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method and a device for preparing continuous carbon nanotube fibers by CVD. Background technique [0002] Carbon nanotube fiber is a macroscopic material formed by the arrangement of many carbon nanotubes along its axial direction. Due to its unique one-dimensional tubular structure and excellent electrical properties, high thermal conductivity, good thermal and chemical stability , low density and other advantages, it has important application prospects in aerospace, national defense, energy and other fields. [0003] The large-scale preparation of carbon nanotubes with excellent performance is the key to realize their application. The development of large-scale preparation of carbon nanotube fibers is an important research direction in the field of carbon nanotube fiber research. The CVD floating gas-phase flow spinning method is the most potential method f...

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Problems solved by technology

[0004] However, most of the existing CVD methods for preparing carbon nanotubes have low yields and low utilization of reactants, and most of the carbon is emitted in the form of tail gas or forms amorphous carbon.

Secondly, it is easy to form defects on the surface of the product, and the defects lead to the incomplete structure of carbon nanotubes. When it is stressed, it will generate stress concentration and cause fracture

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