Preparation method of carbon nano-thin film/nano-micron network composite thin film and fiber

Abstract

The invention provides a continuous preparation method of carbon nano-thin film / nano-micron network composite thin film and fiber and relates to the technical field of nanomaterials and preparation thereof. The method includes: forming a nano-micron network on a first substrate; coiling the first substrate, with the nano-micron network, and placing the first substrate in a growth chamber, and increasing temperature under protection of reductive gas; at a preset temperature, introducing a carbon source; transferring the first substrates with the nano-micron networks, in a coil-to-coil manner, at a preset speed, thus directly growing carbon nano-thin film / nano-micron network / first substrate; performing separation to obtain the continuous carbon nano-thin film / nano-micron network composite thin film and composite fiber. In the method, the composite thin film can be separated from the substrate to achieve lossless transfer; the separated composite thin film, due to the supporting effect ofthe network, can exist independently without other supporting layers. The method simplifies production process, greatly reduces production cost, and has a large-scale preparation prospect.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and preparation thereof, in particular to a continuous preparation method of carbon nanofilm / nano-micron network composite film and fiber. Background technique [0002] Carbon is one of the most basic elements in nature. Carbon nanomaterials, such as carbon nanotubes and graphene, which are constructed from carbon atoms from the bottom up, have attracted everyone's attention due to their excellent properties since their discovery. With the gradual development and improvement of preparation methods, carbon nanotubes and graphene have developed from the initial micro-preparation in the laboratory to the macro-preparation in factories. Thanks to this, the excellent performance of carbon nanotubes and graphene can be used in a wider range of fields such as transparent conductivity, energy conversion, super-strong fibers, and protection. [0003] The existing chemical vapor deposition (CVD) meth...

AI Technical Summary

Problems solved by technology

We know that there are many differences in physical and chemical properties between nanomaterials and bulk materials. Specifically, the nano-micro network has the characteristics of small size and high specific surface area, high surface energy, large number of specific surface atoms and close neighbors. Incomplete coordination, these factors lead to a lower melting point than bulk materials, so it is easy to melt or decompose by itself when the temperature is high, and even react with the catalyst substrate, so the growth of carbon nanofilms at the above high temperatures will undoubtedly reduce the original nanomaterials - The nature of the micron network film, resulting in a loss of performance in the final composite film

At the same time, high temperature increases the cost and difficulty of growth, and the requirements for equipment are also very high, which is not conducive to large-scale production

Furthermore, the high temperature process also brings great difficulties to the direct growth of composite thin films on flexible substrates.

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