Method for affecting growth morphology of carbon nanotubes by controlling hydrolysis degree

Abstract

The invention relates to a method for affecting growth morphology of carbon nanotubes by controlling hydrolysis degree, and the method comprises the following steps: (1) preparing a precursor liquid film containing iron ions; (2) baking a substrate to which the precursor liquid film is attached in a constant-temperature oven for a certain time until the substrate is dried; (3) placing the dried substrate in the constant-temperature region of a tubular furnace for annealing treatment; (4) preparing an iron catalyst film with controllable particle size and density; and (5) preparing carbon nanotube arrays with different lengths and morphologies: heating the substrate to a certain temperature in the tubular furnace, introducing acetylene and argon, and decomposing acetylene gas on the surface of the film containing the iron catalyst particles to precipitate vertical carbon nanotube arrays. The method provided by the invention has the beneficial effects that: the purpose that the growth morphology of the carbon nanotubes is affected by controlling the hydrolysis degree is realized, an unexpected effect is acquired, the carbon nanotube growth process is effectively optimized, and the industrial production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of carbon nanotubes, in particular to a method for preparing carbon nanotubes by controlling the morphology of catalysts. Background technique [0002] Carbon nanotubes (Carbon nanotubes), as an emerging hot material in the past two decades, have been widely concerned because of their high electron mobility, thermal conductivity, excellent mechanical properties and chemical stability. Now, among the known preparation methods, thermal chemical vapor deposition (TCVD, Thermal Chemical Vapor Deposition) is the most widely used method for large-scale production of high-quality carbon nanotubes. In this method, the preparation of catalyst nanoparticles is a prerequisite for obtaining high-quality carbon nanotubes, and iron, cobalt, and nickel are commonly used and effective catalysts in this method. In recent years, many research groups have focused on how to control the size and density distribution of catalyst...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the existing method for preparing carbon nanotubes, in the process of forming nano-catalyst particles with controllable size and density, the required process is difficult and costly. The Method of Effect of Degree on the Growth Morphology of Carbon Nanotubes

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