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Method for preparing monodisperse silver core-nickel shell nanoparticles

A nanoparticle, monodisperse technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of non-catalytic application, uneven particle size distribution of products, failure to achieve monodispersity, etc. problem, to achieve the effect of wide application range, good monodispersity and low cost

Inactive Publication Date: 2011-11-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the absence of an appropriate surface stabilizer, the particle size distribution of the prepared product is not uniform enough to achieve monodispersity, and there is no report on catalytic applications

Method used

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  • Method for preparing monodisperse silver core-nickel shell nanoparticles
  • Method for preparing monodisperse silver core-nickel shell nanoparticles
  • Method for preparing monodisperse silver core-nickel shell nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 0.4mmol nickel acetylacetonate, 0.1mmol silver nitrate, 0.6mmol triphenylphosphine and 6ml oleylamine into a three-neck flask, mix under the protection of argon, stir for 10min, then raise the temperature to 80°C, keep the temperature for 15min to fully mix the reactants Evenly, then slowly raise the temperature to 180°C, keep it warm for 40min, and then cool it naturally in the air to room temperature. Ethanol was added to precipitate the nanoparticles, and the reaction mother liquor was taken out by centrifugation, then washed three times with a mixed solution of acetone and n-hexane, and finally dried in vacuum to obtain a black powder. figure 1 It is a transmission electron microscope photo of the product, its appearance is spherical, the particle size distribution is narrow, and the particle diameter is about 15 nanometers; figure 2 It is a high-magnification transmission electron microscope photo of the product, and the core-shell structure can be clearly obs...

Embodiment 2

[0030]Add 0.4mmol nickel acetylacetonate, 0.1mmol silver nitrate, 0.3mmol triphenylphosphine and 6ml oleylamine into a three-necked flask, mix under the protection of argon, stir for 10min, then raise the temperature to 80°C, keep warm for 15min to fully mix the reactants Evenly, then slowly raise the temperature to 200°C, keep it warm for 60min, and then cool it naturally in the air to room temperature. Ethanol was added to precipitate the nanoparticles, and the reaction mother liquor was taken out by centrifugation, then washed three times with a mixed solution of acetone and n-hexane, and finally dried in vacuum to obtain a black powder. Figure 4 It is a transmission electron microscope photo of the product, its appearance is spherical, the particle size distribution is narrow, and the particle diameter is about 17 nanometers; Figure 5 It is a high-power transmission electron microscope photo of the product, and the core-shell structure can be clearly observed, and the th...

Embodiment 3

[0032] Add 0.4mmol nickel acetylacetonate, 0.1mmol silver nitrate, 0.1mmol triphenylphosphine and 6ml oleylamine into a three-neck flask, mix under the protection of argon, stir for 10min, then raise the temperature to 80°C, keep warm for 15min to fully mix the reactants Evenly, then slowly raise the temperature to 220°C, keep it warm for 60min, and then cool it naturally in the air to room temperature. Ethanol was added to precipitate the nanoparticles, and the reaction mother liquor was taken out by centrifugation, then washed three times with a mixed solution of acetone and n-hexane, and finally dried in vacuum to obtain a black powder. Image 6 It is a transmission electron microscope photo of the product, its appearance is spherical, the particle size distribution is narrow, and the particle diameter is about 19 nanometers; Figure 7 It is a high-power transmission electron microscope photo of the product, and the core-shell structure can be clearly observed, and the thic...

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Abstract

The invention relates to metal nanoparticles of a core-shell structure and provides a method for preparing monodisperse silver core-nickel shell nanoparticles and application of monodisperse silver core-nickel shell nanoparticles to catalysis of sodium borohydride for hydrolysis hydrogen production, wherein the method has a simple process and can ensure the monodispersity of products. The method comprises the steps of: adding a mixed solution of metal salt of nickel, metal salt of silver, a surface stabilizing agent, alkylamine or alkylamine and a high-boiling-point organic solvent into a reaction vessel under the protection of inert gas, homogenizing the mixture, heating to 170-240 DEG C and preserving the temperature for 20min-3h to obtain a reaction product; and cleaning the obtained reaction product with an organic solvent mixed solution, centrifuging for separation, and vacuum-drying to obtain the monodisperse silver core-nickel shell nanoparticles. The monodisperse silver core-nickel shell nanoparticles can be applied to catalysis of the sodium borohydride for hydrolysis hydrogen production. The method has the advantages of simple preparation process, relatively low cost and convenience for industrial production.

Description

technical field [0001] The invention relates to a metal core-shell structure nanoparticle, in particular to a method for preparing a monodisperse core-shell structure nanoparticle with silver as the core and nickel as the shell and its use in catalytic sodium borohydride hydrolysis for hydrogen production Applications. Background technique [0002] With the continuous deepening of nanotechnology research, it has been found that the effective combination of two or more nanoparticles through a certain mechanism will lead to the emergence of many excellent physical and chemical properties. Among them, the core-shell nanostructure is the most typical. Core-shell nanostructures are formed by orderly assembling shell substances on the core through chemical bonds or other interactions. Nanoparticles with this structure, in addition to combining the multiple functions of the core and shell, can also generate new properties due to the synergistic effect of their interfaces. Theref...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00B82Y30/00C01B3/06
CPCY02E60/36
Inventor 陈远志郭惠章彭栋梁陈小真岳光辉
Owner XIAMEN UNIV
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