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Method for preparing gold nanoparticles based on environmentally-friendly chemical method

A technology of gold nanoparticles and green chemistry, which is applied in the field of green chemistry to prepare gold nanoparticles with various shapes, can solve the problems of complex overall process, environmental toxicity, etc., and achieve the effect of high purity, less impurities and easy operation

Inactive Publication Date: 2011-10-26
JIANGXI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of synthesizing spherical, multipod or linear gold nanoparticles at home and abroad is mainly to reduce gold chloride by adding chemical reducing agents. These chemical reagents are easy to produce toxic effects on the environment.
In addition, in the traditional process, high concentrations of surfactants and other protective agents are often required to regulate the morphology of nanoparticles, and the overall process is relatively complicated.

Method used

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  • Method for preparing gold nanoparticles based on environmentally-friendly chemical method
  • Method for preparing gold nanoparticles based on environmentally-friendly chemical method
  • Method for preparing gold nanoparticles based on environmentally-friendly chemical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 Preparation of spherical gold nanoparticles

[0019] Add a certain amount of CMC into water, heat it to 50°C to fully dissolve it, and then mix it with the aqueous solution containing chloroauric acid, so that the final concentrations of each component in the solution are: chloroauric acid 0.5mmol / L, CMC 25g / L . The above solution was heated to 80°C for reduction reaction for 8h. After the reaction, the reaction solution was centrifuged with a high-speed centrifuge (12,000 r / min) to separate the product, and the precipitate was washed with water three times to obtain spherical gold nanoparticles with an average particle size of 50 nm.

Embodiment 2

[0020] Embodiment 2 Preparation of multipod shape gold nanoparticles

[0021] Add a certain amount of CMC into water, heat it to 50°C to fully dissolve it, and mix it with the aqueous solution containing auric acid chloride, so that the final concentrations of the components in the solution are: 1mmol / L auric acid chloride and 15g / L CMC. The above solution was heated to 80°C for reduction reaction for 8h. After the reaction, the reaction solution was centrifuged in a high-speed centrifuge (10,000 r / min) to separate the product, and the precipitate was washed three times with water to obtain multipod-shaped gold nanoparticles with an average particle size of 100 nm.

Embodiment 3

[0022] Example 3 Preparation of linear gold nanoparticles

[0023] Add a certain amount of CMC into water, heat it to 50°C to fully dissolve it, and then mix it with the aqueous solution containing chloroauric acid, so that the final concentrations of each component in the solution are: chloroauric acid 0.2mmol / L, CMC 2g / L . The above solution was heated to 80°C for reduction reaction for 8h. After the reaction, the reaction solution was centrifuged with a high-speed centrifuge (11,000 r / min) to separate the product, and the precipitate was washed three times with water to obtain linear gold nanoparticles with a width of about 10 nm and a length of more than 400 nm.

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Abstract

The invention provides a method for preparing spherical, polypodia-shaped and linear gold nanoparticles based on an environmentally-friendly chemical method. The method provided by the invention is characterized by comprising the following steps: on the basis of adopting sodium carboxy methyl cellulose (CMC) as a reducing agent and a protective agent, reducing HAuC14 into the spherical, polypodia-shaped and linear gold nanoparticles. During the reaction process, the CMC and HAuC14 can play a role in controlling the shape and dimension of the gold nano materials. After being subjected to high-speed centrifugation, the reaction product is precipitated and washed with water to obtain the gold nanoparticles which have better particle size distribution and special appearance. The method provided by the invention belongs to the technical field of preparation of nano materials in metal materials. The method has the characteristics that the nano dimension and shape of the product can be controlled, and the conventional reducing agent during thermochemical synthesis of the gold nano materials are omitted, so that the method is environment-friendly, easy to separate and simple and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of nanoparticle preparation, in particular to a method for preparing gold nanoparticles with various shapes by using a green chemical method. Background technique [0002] Gold is one of the most stable elements in chemical properties, but nano-scale gold particles do have special physical and chemical properties. Nanogold refers to tiny particles of gold with a diameter of 1-100nm. It has high electron density, dielectric properties and catalytic effect, and can combine with various biological macromolecules without affecting its biological activity. Gold nanoparticles of various particle sizes can be conveniently prepared by the reduction method from chloroauric acid, and its color is red to purple depending on the diameter. [0003] Due to the special shape and optical properties of gold nanoparticles, they are widely used in catalysis, optoelectronic devices and biomedicine, especially in molecular labe...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00B82Y30/00
Inventor 王纯荣周煌谭智美
Owner JIANGXI AGRICULTURAL UNIVERSITY
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