A method for directly growing carbon nanotube arrays on fiber substrates

Abstract

The invention provides a method for directly growing a carbon nano tube array on a fiber substrate. The method comprises the following steps: (1) pre-treating the fiber substrate; (2) attaching a catalyst precursor on the surface of the substrate obtained in the step 1, wherein the catalyst comprises transitional metal elements such as Fe, Co, Ni, Cu, Au, Pt, Mo or Ag; (3) putting the substrate obtained in the step (2) in a reaction furnace, heating the substrate to a first temperature and maintaining for a preset time, and introducing inert gas to remove organic matters in the catalyst precursor; (4) heating to a second temperature and maintaining for a preset time, continuously introducing inert gas, introducing mixed gas of reductive gas and carbon source gas, maintaining the pressure in the reaction furnace, and growing high-density carbon nano tubes on the surface of the substrate; and (5) after reaction, stopping introduction of the reductive gas and carbon source gas, and continuously introducing inert gas till the temperature is reduced to room temperature.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for directly growing carbon nanotube arrays on a fiber substrate. Background technique [0002] Since its discovery in 1991, carbon nanotubes (CNTs) have attracted much attention due to their unique mechanical, chemical and electrical properties, unique one-dimensional tubular structure and broad application prospects. Carbon nanotubes have strong tensile strength, good charge transport performance, high thermal conductivity, and good thermal stability in air. For example, it can be used as an electrode material for green energy storage devices to promote electron transfer, such as fuel cells, supercapacitors, all-vanadium redox flow batteries and organic solar cells, and has broad application prospects. [0003] At present, many researchers have grown carbon nanotube arrays on sapphire substrates, silicon substrates, quartz substrates, glass substrates...

AI Technical Summary

Problems solved by technology

However, in the prior art, the carbon nanotubes synthesized on the fiber substrate have many crystal defects, and the obtained carbon nanotubes are non-directional and entangled, which makes the excellent diameter ratio and specific surface area of ​​the carbon nanotubes large. However, the excellent properties of many one-dimensional materials cannot be effectively utilized, which seriously affects the research and practical application of carbon nanotubes.

Chinese patent (201210448832.0) discloses a method for directly growing arrayed carbon nanotubes by CVD, which provides a method for preparing carbon nanotube arrays with simple procedures, high density, and suitable for industrialization, but the method is to first The catalyst precursor on the surface of the substrate is reduced at high temperature, and then the carbon source gas is introduced to synthesize carbon nanotubes, which will easily lead to the diffusion of catalyst components on the surface of the fiber substrate, resulting in deactivation of the catalyst and damage to the mechanical properties of the carbon fiber substrate, resulting in the formation of carbon nanotubes. The carbon nanotubes have more crystal defects, which reduces the application range of carbon nanotubes

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