A kind of preparation method of synthetic cobalt-gold bimetallic alloy nanoparticles

A technology for synthesizing cobalt-gold alloy nanoparticles and cobalt-gold, which is applied in the field of preparation of cobalt-gold bimetallic alloy nanoparticles, which can solve problems affecting material performance and application, single product structure, poor component adjustability, etc., and achieve low reaction toxicity , simple process and short reaction time

Inactive Publication Date: 2011-12-14
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has achieved some successful examples in the preparation of gold / magnetic metal composite nanomaterials, due to the limitations of the method, there are disadvantages such as single structure of the obtained product and poor component adjustability, which affect the performance and quality of the material. application

Method used

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  • A kind of preparation method of synthetic cobalt-gold bimetallic alloy nanoparticles
  • A kind of preparation method of synthetic cobalt-gold bimetallic alloy nanoparticles
  • A kind of preparation method of synthetic cobalt-gold bimetallic alloy nanoparticles

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preparation example Construction

[0021] The preparation method of a kind of synthetic cobalt-gold bimetallic alloy nano-particle that the present invention proposes adopts chemical solution method, such as figure 1 As shown, it specifically includes the following steps:

[0022] Step 1: Add polyvinylpyrrolidone (PVP) and inorganic salt of cobalt to ethylene glycol solvent (purity greater than 98%), the molar ratio of polyvinylpyrrolidone (PVP) and inorganic salt of cobalt is 0.5: 1~3: 1 , the molar concentration of cobalt ions is 0.01-0.05 mol / L to obtain a mixed solution. The inorganic salt of cobalt is selected from any one of cobalt chloride, cobalt acetate and cobalt nitrate.

[0023] Step 2: Add 1.5 to 3.0 mL of hydration well (mass fraction greater than or equal to 50%) to the mixture under stirring conditions, and after stirring evenly, a pink turbid solution is obtained, and further add substances to it under stirring conditions The concentration is 1×10 -4 ~1×10 -2 mol / L (preferably 5×10 -3 mol / ...

Embodiment 1

[0027] A preparation method for synthesizing cobalt-gold bimetallic alloy nanoparticles proposed in this embodiment specifically includes the following steps:

[0028] Step 1: Add 0.011g polyvinylpyrrolidone (PVP) and 0.018g cobalt acetate to 10mL ethylene glycol solvent (purity greater than 98%), the mol ratio of polyvinylpyrrolidone (PVP) and cobalt acetate is 1: 1, cobalt ion The molar concentration was 0.01 mol / L, and a mixed solution was obtained.

[0029] Step 2: under stirring condition, add 1.5mL hydration well (mass fraction equals 50%) to mixed solution, after stirring evenly, obtain pink turbid solution, continue to wherein further add 20mL chloroauric acid ethyl alcohol under stirring condition Glycol solution (5×10 -3 mol / L), keep the molar ratio of cobalt ions and gold ions in the solution at 1:1, the solution turns from pink to blue-purple, heat with an electric heating mantle, and react for 2 hours at a reaction temperature of 195° C., the solution A black pr...

Embodiment 2

[0033] A preparation method for synthesizing cobalt-gold bimetallic alloy nanoparticles proposed in the embodiment of the present invention specifically includes the following steps:

[0034] Step 1: To 20mL ethylene glycol solution (purity is greater than 98%), then add 0.33g polyvinylpyrrolidone (PVP) 0.239g cobalt chloride hexahydrate therein, the mol ratio of the inorganic salt of polyvinylpyrrolidone (PVP) and cobalt The ratio is 3:1, the molar concentration of cobalt ions is 0.05mol / L, and a mixed solution is obtained.

[0035] Step 2: Add 1.5 to 3.0 mL of hydration trap (mass fraction greater than or equal to 50%) to the mixture under stirring conditions, and after stirring evenly, a pink turbid solution is obtained, and further add 20 mL of chlorine to the mixture under stirring conditions Ethylene glycol solution of gold acid (5×10 -3 mol / L), keep the molar ratio of cobalt ions and gold ions in the solution at 10:1, and react for 2 hours at a reaction temperature of ...

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Abstract

The invention provides a method for preparing a synthesized cobalt-gold double-metal alloy nano particle and belongs to the technical field of inorganic material preparation processes. The method comprises the following steps of: 1, adding polyvinylpyrrolidone and inorganic salt of cobalt into an ethylene glycol solvent to obtain mixed solution; 2, under the condition of stirring, adding hydrazine hydrate and ethylene glycol solution of chloroauric acid into the mixed solution sequentially; and 3, removing a heating source after the reaction is stopped, performing centrifugal separation, collection and deposition, washing by using ethanol and drying. The cobalt-gold double-metal alloy nano particle prepared by using the method for preparing the synthesized cobalt-gold double-metal alloy nano particle has the characteristic of a chain structure. In the method, inorganic substances are used as raw materials, so the reaction is low in toxicity and the raw materials are more economical; the cobalt and the gold of the product are distributed uniformly, and a proportion of the cobalt to the gold can be regulated within a certain range; moreover, the reaction time is short, the process is simple and the production can be enlarged easily.

Description

technical field [0001] The invention relates to a preparation method for synthesizing cobalt-gold bimetallic alloy nanoparticles, and belongs to the technical field of preparation of inorganic compound semiconductor materials. Background technique [0002] The combination of gold and magnetic nanoparticles will not only realize the optical-magnetic function compounding, but also help to overcome the disadvantages of easy agglomeration and poor chemical stability of magnetic nanoparticles in the application. Sensing, imaging, disease diagnosis and drug delivery) have great application prospects. In recent years, the synthesis and properties of gold / magnetic nanoparticle composites have become a hotspot in the field of international frontier research. [0003] At present, the method used in the preparation of gold / magnetic metal composites is mainly the oxidation-reduction method, that is, using relatively active magnetic metal particles as self-sacrificing templates, adding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 张东凤郭林张茜
Owner BEIHANG UNIV
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