Heat treatment method for preparing carbon coating nano composite particles by using gas carbon source

A nanocomposite and nanoparticle technology, applied in the direction of gaseous chemical plating, metal material coating process, coating, etc., can solve the problem that it is impossible to obtain multiple types of carbon-coated metal nanoparticles, and the thickness of the carbon coating layer cannot be effectively achieved. Control, metal material type restrictions and other issues, to achieve the effect of low requirements for heating devices, easy large-scale production, and realize large-scale production

Inactive Publication Date: 2008-07-02
DALIAN UNIV OF TECH
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Problems solved by technology

In 1998, Dong et al. used the arc method to evaporate bulk Fe in a carbon-rich methane atmosphere, and obtained carbon-coated metal nanoparticles (X.L.Dong et a1.Characterization of ultrafine γ-Fe(C), α-Fe(C)and Fe 3 C particles synthesized by arc-discharge in methane, J.Mater.Sci.33 (7), 1915 (1998)), this is an effective method to obtain a single carbon-coated metal nanoparticles; but because it is under non-equilibrium conditions In situ evaporation, the thickness of the carbon coating layer cannot be effectively controlled; in addition, under the conditions of in situ evaporation, the types of metal materials that can be coated are also limited, and it is impossible to obtain a variety of carbon coated metal nanoparticles

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  • Heat treatment method for preparing carbon coating nano composite particles by using gas carbon source
  • Heat treatment method for preparing carbon coating nano composite particles by using gas carbon source

Examples

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Effect test

Embodiment 1

[0022] Weigh 5g of nickel metal nanopowder (the surface of the nanopowder is coated with a nickel oxide layer), put it in a crucible and put it into a vacuum annealing furnace, evacuate to several Pa, heat to 100°C, keep warm and continue to evacuate for 30min, and then close Exhaust valve; filled with methane gas to 5×10 4 Pa, heat to 400°C and keep warm for 30 minutes; slowly vacuumize to remove residual methane and water vapor, etc., slowly fill in an inert gas mixed with oxygen (5%) to an atmospheric pressure, and passivate for 1 hour; discharge the inert gas for passivation, and fill into the air and remove the powder sample.

Embodiment 2

[0024] Weigh 5g of nickel metal nanopowder (the surface of the nanopowder is coated with a nickel oxide layer), put it in a crucible and put it into a vacuum annealing furnace, evacuate to several Pa, heat to 100°C, keep warm and continue to evacuate for 30min, and then close Exhaust valve; filled with methane gas to 5×10 4 Pa, heat to 650°C for 30 minutes; slowly vacuumize, remove residual methane and water vapor, etc., slowly fill in an inert gas mixed with oxygen (5%) to an atmospheric pressure, passivate for 1 hour; discharge the inert gas for passivation, fill into the air and remove the powder sample.

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Abstract

A method for preparing carbon-coated composite nanoparticle by heat treatment using a gas carbon source belongs to the field of carbon-related nanomaterial preparation technology. The invention is characterized in that metal, alloy and ceramic nanoparticles are subjected to surface carbon coating. Heat treatment is carried out in carbon-rich atmosphere, and the gas carbon source is decomposed to achieve deposition, nucleation, growth and crystallization of carbon atoms on the surface of the nanoparticles, thus forming a nanostructure coated with a plurality of carbon layers. The thickness of the carbon coating layer on the surface of the nanoparticles as well as the output ratio of the carbon-coated nanoparticles to carbon nanotubes produced in the processed product can be controlled by properly selecting the type of carbon-rich gas, the pressure, the heat treatment temperature as well as the gas flow rate while dynamic processing. The invention has the advantages that the method has low requirement for a vacuum, gas charging / discharging and heating device by adopting a conventional vacuum processing furnace and has easily-controlled parameters, and scale production can be easily achieved.

Description

technical field [0001] The invention belongs to the technical field of carbon-related nanometer material preparation. It is a method of heat-treating various nanoparticles in a carbon-rich atmosphere, forming multilayer carbon coating layers or multi-walled carbon nanotubes on the surface of nanoparticles through atmosphere decomposition, carbon atom deposition, nucleation, growth and crystallization. way. Background technique [0002] Since the discovery of fullerenes in 1985, the discovery of carbon nanotubes that can be filled with substances in 1991, and the discovery of nano-carbon onions and metal-filled carbon nanostructures later, carbon-related nanoscience research has been greatly developed. These nano-carbon materials have unique structures and properties. Carbon shells or carbon nanotubes can confine metal substances in a small space, which can avoid the influence of the environment on nano-metal materials and solve the problem that nano-metal particles cannot e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/26C23C16/44C23C16/52
Inventor 董星龙黄昊吕波
Owner DALIAN UNIV OF TECH
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