Preparation method for carbon nanotube array cathode on Fe-based metal alloy substrate

Abstract

The invention provides a preparation method for a carbon nanotube array cathode on a Fe-based metal alloy substrate. According to the method, the contents of iron and chromium elements in a sedimentary deposit of the surface layer of the Fe-based metal alloy are regulated and controlled, chromium oxide and iron catalyst particles are obtained via oxidation and reduction, wherein the chromium oxide is arranged between the substrate and the iron catalyst particles in a stable manner so that the iron catalyst particles cannot react with the substrate, large-scale diffusion of the iron catalyst particles can be suppressed, and high-density and uniformly-distributed nanometer iron catalyst particles are obtained; and crack and nucleation of acetylene are performed via the catalysis of the iron nanometer particles so that the carbon nanotube array cathode is formed. The carbon nanotube array cathode reacts with the Fe-based alloy substrate in the processing process of vacuum high-temperature annealing, the carbon nanotube and the substrate are organically combined so that the transfer of electrons and heat between the carbon nanotube and the substrate can be effectively enhanced, and the performance of the field emission of the carbon nanotube array cathode is comprehensively improved.

Description

Technical field [0001] The invention belongs to the technical field of carbon nanotubes, and in particular relates to a method for preparing a carbon nanotube array cathode on an iron-based metal alloy substrate. Background technique [0002] Since the discovery of carbon nanotubes at the end of the last century, the research on its preparation method, growth mechanism and physical properties has received extensive attention from the fields of physics, chemistry and materials science, and has made practical progress in many aspects of research. Carbon nanotubes have unique structural features and physical properties, such as small radius of curvature, large aspect ratio, high electrical and thermal conductivity, good mechanical strength, and excellent chemical stability, making them ideal field emission cathode materials. The earliest report on the field emission research of carbon nanotubes was published by DeHeer et al. in Science in 1995. So far, carbon nanotubes have been wi...

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Problems solved by technology

[0006] However, in the prior art, the iron-based metal alloy substrate is directly oxidized to precipitate iron nanoparticles as catalyst particles required for the growth of carbon nanotubes, but this method leads to the production of catalyst particles with different sizes and uneven distribution. Nanoparticles are easily reduced and lose their catalytic activity, which stops the growth of carbon nanotubes

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