Preparation method of oriented carbon nanotube film

Abstract

The invention discloses a preparation method of an oriented carbon nanotube film, and belongs to the field of film material preparation. The preparation method is characterized by comprising the following steps: step A, adopting a magnetic multi-walled carbon nanotube, which is prepared by steps of subjecting carboxylated multi-walled carbon nanotubes to polymeric modification and evenly loading magnetic particles on the modified multi-walled carbon nanotubes through a chemical co-precipitation method; step B, adding the obtained magnetic carbon nanotubes obtained in the step A into a solvent, mixing, and fully dispersing the carbon nanotubes to obtain a stable carbon nanotube solution; step C, adopting a vacuum suction filtration method: pouring the magnetic carbon nanotube solution obtained in the step B into a vacuum suction filtration device, applying a magnetic field on the device, and changing the direction of the magnetic field so as to obtain an in-plane vertical oriented film or an in-plane horizontal oriented film; step D, removing the substrate film by liquid nitrogen so as to obtain the oriented carbon nanotube film. The method is simple and efficient, the film structure is uniform and complete; the orientation degree can be controlled by changing the strength of magnetic field and the grafting rate of magnetic nano particles on the carbon nanotubes, and the integrity of oriented film structure is guaranteed by spraying liquid nitrogen.

Description

technical field

[0001] The invention belongs to the field of film material preparation, and in particular relates to a method for polymer-modified carbon nanotube orientation and film formation. Background technique

[0002] Due to their unique structure and surface properties, carbon nanotubes have excellent physical, chemical, electrical, optical, and mechanical properties, and are widely used in many fields such as chemical industry, electronics, and energy. In order to further expand the application field of carbon nanotubes, the development of macroscopic materials composed of carbon nanotubes has become one of the feasible ways. At present, macro-scale carbon nanotube bulk materials include arrays, films, fibers, etc. Among them, carbon nanotube films have attracted much attention due to their simple preparation methods, excellent electrical conductivity and wide application fields. However, due to the van der Waals force, carbon nanotubes are easily entangled with ea...

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