Core-shell structure nanometer composite particle as well as preparation method and preparation device thereof

Abstract

The invention relates to a core-shell structure nanometer composite particle as well as a preparation method and a preparation device thereof. The preparation method comprises the following steps of using a fluidized bed chemical vapor deposition method; respectively obtaining core materials and shell materials in a way of controlling the temperature region distribution in a fluidized bed reactorand a precursor steam inlet; realizing in-situ coating; obtaining the core-shell structure nanometer composite particle. The prepared core-shell structure nanometer composite particle has the advantages that the coating between the core and the shell is uniform; the particle shape and dimension are controllable; various function coupling of the material can be realized; the core-shell structure nanometer composite particle is applied to the fields of biological medicine, electronic and semi-conductors, luminescence, catalysis and the like. The technical flow process is simple; the operation ofthe process is convenient and fast; the cost is low; the industrial production can be favorably realized.

Description

technical field [0001] The invention relates to the technical field of preparation of core-shell structure nano-composite particles, in particular to a core-shell structure nano-composite particle, its in-situ fluidized bed chemical vapor deposition preparation method, and a preparation device thereof. Background technique [0002] Core-shell structure nanocomposite particles are two-phase composite materials composed of core structure materials and shell structure materials, which not only have the independent properties of core particles and shell materials, but also obtain unique coupling properties from the combination of core and shell materials. Performance has been widely concerned and researched. [0003] Core-shell structure nanocomposite particles can be divided into inorganic / inorganic, inorganic / organic, organic / inorganic and organic / organic core-shell structure particles according to the composition of core and shell two-phase materials. Due to the diversity an...

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Problems solved by technology

However, the liquid-phase method has the following disadvantages: (1) The preparation temperature is low, and many materials that require high-temperature synthesis cannot be prepared, and the selection of material systems is limited; (2) The force between the core structure and the shell structure is weak, and it is easy to occur The separation of the core structure and the shell structure; (3) the phenomenon of particle aggregation is very easy to occur, and it is difficult to obtain the core-shell structure nanocomposite particles with good dispersion; (4) the deposition and surface reaction method and the sol-gel method are two step method, it is easy to cause side reactions on the surface of the core structure before coating the shell structure, such as surface oxidation, so that the expected core-shell structure particles cannot be obtained

[0005] Compared with the liquid-phase method, the preparation of core-shell nanocomposite particles by the gas-phase method has simple steps, good particle dispersion, and is conducive to industrial production; but there are also problems such as uneven coating of the shell structure and wide particle size distribution.

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