Needle-shaped carbon nano tube for packaging magnetic particles and preparation method of needle-shaped carbon nano tube

Abstract

The invention belongs to a carbon nanotube preparation technology in the technical field of composite materials, and particularly relates to a needle-shaped carbon nanotube for packaging magnetic particles and a preparation method of the needle-shaped carbon nanotube. The carbon nano tube is in a needle shape and is characterized in that the carbon nano tube is provided with a thick end and a thin end, the diameter of the thick end ranges from 140 nm to 220 nm, the diameter of the thin end ranges from 35 nm to 65 nm, the length of the needle-shaped carbon nano tube ranges from 1.5 micrometers to 4.0 micrometers, and magnetic particles are packaged in the needle-shaped carbon nano tube. The specific preparation method comprises the following steps: dissolving a catalyst precursor iron salt in a solvent, adding a carbon source, stirring, evaporating the solvent to dryness to obtain mixture powder of the catalyst and the carbon source, heating the mixture to a set temperature in a flowing inert atmosphere, and keeping the temperature for a certain time at the set temperature to obtain black powder which is the needle-shaped carbon nanotube for packaging the magnetic particles; in the heating and heat preservation process, the morphology of the carbon nanotube can be regulated and controlled by changing the gas flow rate, the heat preservation temperature and the mass ratio of the catalyst to the carbon source.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to the technical field of carbon nanotube preparation, in particular to a needle-shaped carbon nanotube encapsulating magnetic particles and a preparation method thereof. Background technique [0002] Carbon nanotubes are one-dimensional nanomaterials with excellent mechanical properties, chemical stability, electrical conductivity, and thermal conductivity. Their ideal structures play an important role in the fields of mechanics, electricity, and heat. Chemistry, biology, physics, or some interdisciplinary subjects also have broad application prospects, specifically applicable to optical sensors, electrode materials, flat panel displays, and wave-absorbing materials. In order to further improve the performance of carbon nanotubes, researchers have prepared carbon nanotubes of different shapes through various methods, and have achieved important results in many fields. H...

AI Technical Summary

Problems solved by technology

The arc discharge method is to use high-purity graphene as the cathode and anode. When the arc discharge occurs between the two electrodes, the high temperature generated will gasify the anode. The carbon decomposed by gasification will form a ring, and finally form carbon nanotubes. In the cathode, but this method is cumbersome and complicated, and the purity of the generated carbon nanotubes is extremely low, which must undergo subsequent purification treatment, which is not suitable for mass production

The laser ablation method uses a laser beam to bombard a graphene target, and after gasification, it is deposited on the surface of a conical water-cooled copper tube under the carrying of an inert atmosphere to form carbon nanotubes. The low yield of this method is not conducive to large-scale production, and it is safe. Hidden danger and cannot accurately control the diameter and length of carbon nanotubes

Chemical vapor deposition is a method that is widely used at present. It first deposits a layer of catalyst substrate, and then passes in gas as a carbon source. Using high temperature, the carbon source gas is decomposed into contact with the catalyst, and catalyzed to form carbon nanotubes. This preparation method is complicated to operate and the cost of the deposition system is very high, which is not conducive to practical application. Therefore, it is necessary to provide a preparation method of carbon nanotubes with simple operation, low cost, suitable for large-scale production and controllable morphology and structure.

Images