Method for preparing compounds of iron nano-particles coated with carbon nano tube/graphite

Abstract

Based on the plasma enhanced chemical vapor deposition technology, the content of CH<4> and H<2> is controlled, Co (Fe, Ni) particles deposited on a silicon wafer are adopted as catalysts to compound a carbon nano tube, the carbon nano tube is adopted as a substrate, and compounds of iron nano-particles coated with the carbon nano tube / graphite are obtained through compounding. It is found that in the deposition process, as deposition time is prolonged, the carbon nano tube is coated with more and more spherical nano particles, the diameter of the particles ranges from 1 nm to 30 nm, and it is proved that the iron nano-particles are coated with the graphite. The compounds of the iron nano-particles coated with the carbon nano tube / graphite show the typical soft ferromagnetic property at room temperature, the saturation magnetization strength is 80 emu / g, and compared with the coercivity (1Oe) of Fe blocks, the coercivity of the prepared compounds is increased to 60 Oe.

Description

technical field [0001] The invention relates to a method for preparing a composite of carbon nanotubes / graphite-coated iron nanoparticles. More specifically, the invention uses a single crystal silicon wafer as a substrate and Co(Fe, Ni) particles as a catalyst to synthesize carbon nanotubes, by controlling the CH 4 and H 2 content and deposition time, the composite of carbon nanotubes / graphite-coated iron nanoparticles was prepared. Background technique [0002] For more than two decades, carbon nanotubes have attracted great attention due to their unique physical and chemical properties, high specific surface area, high thermal stability, and high electrical conductivity. Coating metal nanoparticles on carbon nanotubes In order to obtain a novel composite, this composite material has gas-sensing, catalytic, conductive and magnetic functions; because magnetic nanoparticles such as metal iron, cobalt, and nickel are unstable in the air or in an acidic environment, people h...

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Problems solved by technology

[0002] For more than two decades, carbon nanotubes have attracted great attention due to their unique physical and chemical properties, high specific surface area, high thermal stability, and high electrical conductivity. Coating metal nanoparticles on carbon nanotubes In order to obtain a novel composite, this composite material has gas-sensing, catalytic, conductive and magnetic functions; because magnetic nanoparticles such as metal iron, cobalt, and nickel are unstable in the air or in an acidic environment, people have been researching them in recent years. In the extensive exploration of how to coat a layer of silicon, organic polymers or carbon on the surface of metal nanoparticles as a protective shell, however, the current challenge is how to use a simple method to synthesize carbon-coated materials with controllable size. metal nanoparticles

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