Preparation method and device of high-conductivity carbon nanotube film

Abstract

The invention provides a preparation method and device of a high-conductivity carbon nanotube film. The preparation method comprises the following steps: preparing a carbon nanotube aerosol at high temperature by utilizing a floating catalytic cracking method, introducing the carbon nanotube aerosol into a closed cavity, arranging a substrate in the position corresponding to a slit formed on the closed cavity, inducing a carbon nanotube in the closed cavity to penetrate the slit by an oriented magnetic field, and depositing the carbon nanotube on the substrate in an oriented manner to form the high-conductivity carbon nanotube film. According to the preparation method disclosed by the invention, the large-area, continuous, low-cost and high-efficient preparation of the high-performance carbon nanotube film can be realized; and under the situation that the light transmittance of the substrate is about 92%, the light transmittance of the high-conductivity nanotube film can be up to 88%, and the surface resistance can be as low as 100omega / unit.

Description

Technical field [0001] The invention relates to a method and device for preparing a conductive film, in particular to a method and device for preparing a highly conductive carbon nanotube film, belonging to the field of materials science. Background technique [0002] Since Iijima discovered carbon nanotubes in 1991, carbon nanotubes have received great attention in a series of fields due to their unique delocalized electronic structure and physical and chemical properties. As one of the important applications, carbon nanotube thin film technology has also made some progress in recent years. So far, there are mainly two ways to realize the preparation of carbon nanotube films. One of them is to subject the dispersed carbon nanotubes to film forming processes such as vacuum filtration, coating, and printing to obtain a carbon nanotube film, which we call the "wet method." In the wet film formation, after the carbon nanotubes are dispersed, the length and structure of the carbon ...

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Problems solved by technology

The other is based on the carbon nanotube suction filtration film forming technology formed by the floating catalytic cracking method. After the carbon nanotube gas is filtered through the filter membrane, a thin film is formed on the filter membrane. This method is limited by the size of the reaction tube and the porous filter. Due to the limitation of film size, it is difficult to obtain large-sized carbon nanotube films; at the same time, the obtained film needs to be transferred to form a film on the desired substrate, which is not only inconvenient to operate, but also difficult to transfer carbon nanotube films to On fragile glass substrates, resulting in great limitations in application

[0004] Recently, the inventor of this case also discovered that the patent with the publication number CN101707904A discloses a method of directly attaching carbon nanotubes prepared by the floating catalytic cracking method to a substrate to form a film, but the temperature used in this method is limited to below 200°C, greatly The reaction conditions of catalytic cracking are limited, which is not conducive to the synthesis of high-quality carbon nanotubes. At the same time, because of the high temperature at the film-forming place, it is difficult to form carbon nanotube films on polymer films. In addition, during the process of carbon nanotubes attaching to the substrate Lack of effective guiding force, it is difficult to achieve controllability and uniformity of the film

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