Method for preparing nanometer particles of nickel-carbide nickel core-shell structure

Abstract

The invention relates to a method for preparing nanometer particles of a nickel-carbide nickel core-shell structure. The method includes the following steps of firstly, evenly mixing nickel precursor compounds, octadecene and alkylamine to obtain mixed liquid A; secondly, injecting trioctylphosphine into the mixed liquid A under the protection of argon, and evenly mixing the trioctylphosphine with the mixed liquid A to obtain mixed liquid B; thirdly, after mixing the octadecene with the alkylamine, injecting inert gas argon into the mixture of the octadecene and the alkylamine and conducting stirring at the room temperature, injecting the trioctylphosphine and evenly conducting mixing to obtain mixed liquid C; fourthly, keeping the temperature of the mixed liquid B and packing the mixed liquid B into an injection pump; fifthly, continuously injecting the mixed liquid B into the heated mixed liquid C to react to obtain a solution of the nanometer particles of the nickel-carbide nickel core-shell structure; sixthly, cooling the solution of the nanometer particles of the nickel-carbide nickel core-shell structure, adding absolute ethyl alcohol into the solution, conducting centrifugal separation to obtain sediments, sequentially conducting washing, centrifugal separation and vacuum drying on the sediments until the weight of the sediments is constant, and then obtaining the nanometer particles of the nickel-carbide nickel core-shell structure. By means of the method, the thickness, the shape and the appearance of a shell can be controlled.

Description

technical field [0001] The invention relates to the preparation of a magnetic nano particle, in particular to a preparation method of a nickel-nickel carbide core-shell nano particle. Background technique [0002] Compared with bulk materials, metal nanomaterials exhibit unique electrical, optical, magnetic and chemical properties, which are mainly due to their surface effects, volume effects and quantum size effects. widespread attention. However, due to the high activity of the surface layer of metal particles, they are prone to agglomeration and are easily oxidized when exposed to the air, especially the magnetic metal nickel nanoparticles are more likely to be oxidized in the air, which greatly limits their performance and application range. If the magnetic metal nanoparticles are coated with an inactive layer to form a core-shell structure, the magnetic properties of the inner metal particles will not be significantly affected, and at the same time, the problem of easy...

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Problems solved by technology

[0004] At present, nickel nanoparticles with different crystal forms have been synthesized, such as fcc-Ni, hcp-Ni, and Ni3C, but there are few reports on the synthesis of Ni-Ni3C core-shell structure, Zhang et al. (Nano Lett.2008, 8, 1147 -1152) reported one-dimensional nickel-nickel carbide core-shell nanochains, using a chemical liquid phase method to synthesize particles between 30 and 50 nm in one step, with a shell thickness between 1 and 4 nm. The coercive force of the chain is enhanced compared with that of a single nickel nanowire, but the synthetic core-shell nanochain is not uniform, serious agglomeration occurs, and the thickness of the shell is thicker.

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