Gold nanoparticles and preparation method thereof

A technology of nano-gold particles and tetrachloroauric acid, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that the size of nano-gold particles cannot be controlled, and achieve a simple and easy preparation method Good, broad application prospects, good uniformity

Inactive Publication Date: 2014-03-12
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The particle size and uniformity of the gold nanoparticles prepared by the existing methods still need to be further improved, and the size of the obtained gold nanoparticles cannot be controlled

Method used

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  • Gold nanoparticles and preparation method thereof
  • Gold nanoparticles and preparation method thereof
  • Gold nanoparticles and preparation method thereof

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preparation example Construction

[0014] According to the preparation method of nano-gold particles of the present invention, the method comprises contacting tetrachloroauric acid with a reducing agent in the presence of a solvent and a stabilizer, and the stabilizer is mercaptolated methoxypolyethylene glycol amine .

[0015] According to the method for preparing gold nanoparticles of the invention, the thiolated methoxypolyethylene glycol amine of the stabilizer can be obtained commercially, or can be prepared by methods known in the art. Preferably, the methoxypolyethylene glycol amine used in the present invention The stabilizer mercaptolated methoxypolyethylene glycol amines are all commercially available from Beijing Xikai Innovation Technology Co., Ltd., for example, products with product number SK6-1 and product number SK6-1-05.

[0016] According to the method for preparing gold nanoparticles of the invention, preferably, the weight average molecular weight of the mercaptolated methoxypolyethylene gly...

Embodiment 1

[0028] This example is used to illustrate the preparation of gold nanoparticles provided by the present invention.

[0029] (1) Add 1mL of tetrachloroauric acid solution with a concentration of 1g / 100ml into 5mL triple distilled water and stir for 10min at 25°C;

[0030] (2) Add 2.5 mL of mercaptolated methoxypolyethylene glycol amine (weight average molecular weight: 2000) aqueous solution with a concentration of 2.5 g / 100 ml to the solution obtained in step (1), and stir for 20 min;

[0031] (3) Slowly add 1mL of sodium borohydride aqueous solution with a concentration of 2g / 100ml into the solution obtained in step (2), and stir at a speed of 1700rpm for 2h while adding dropwise to obtain a dark solution, which is the gold nanoparticle solution , observed by transmission electron microscopy, such as figure 1 a and figure 1 As shown in b, the particle size distribution of the obtained gold nanoparticles is 1 ± 0.6 nm.

Embodiment 2

[0033] This example is used to illustrate the preparation of gold nanoparticles provided by the present invention.

[0034] (1) At 30°C, add 1 mL of tetrachloroauric acid aqueous solution with a concentration of 1 g / 100 ml into 7 mL of triple distilled water and stir for 10 min;

[0035] (2) Add 2 mL of an aqueous solution of thiolated methoxypolyethylene glycol amine (with a weight average molecular weight of 2000) at a concentration of 2 g / 100 ml to the solution obtained in step (1), and stir for 20 min;

[0036] (3) Slowly add 1mL of sodium borohydride aqueous solution with a concentration of 1.5g / 100ml into the solution obtained in step (2), and stir at a speed of 1500rpm for 5h while adding dropwise to obtain a dark solution, which is gold nanoparticles solution, observed by transmission electron microscopy, such as figure 2 a and figure 2 As shown in b, the particle size distribution of the obtained gold nanoparticles is 3.2 ± 0.7 nm.

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Abstract

The invention discloses gold nanoparticles and a preparation method thereof. The method comprises the steps of enabling chloroauric acid hydrated to make contact with a reducing agent on the condition that a solvent and a stabilizer exist, wherein the stabilizer is thiol-functionalized methoxypolyethylene glycol amine. The preparation method of the gold nanoparticles is easy to achieve, the sizes of the obtained gold nanoparticles are small and uniform, the gold nanoparticles are good in dispersity in the solution and wide in application prospect, and a new simple and direct way is provided for preparation of the gold nanoparticles.

Description

technical field [0001] The present invention relates to a nano-gold particle and a preparation method thereof, in particular to a preparation method of an ultra-small-sized gold nano-particle which is uniformly dispersed and capable of controlling the size of the nano-gold particle, and a nano-gold particle prepared by the method. gold particles. Background technique [0002] Gold nanoparticles have unique physical and chemical properties, and have received great attention and research in recent years, and are widely used in the fields of optics, catalysis, and biomedicine. As far as the preparation method of nano gold is concerned, chemical reduction method is mostly used. That is, a reducing agent is used to reduce the gold ions in the tetrachloroauric acid solution to gold atoms to form gold nanoparticles. The reducing agents used include inorganic reducing agents and organic reducing agents. The commonly used inorganic reducing agents are sodium borohydride with strong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
Inventor 梁兴杰马会利霍帅东
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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