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Process for preparing gold nano particle by using aqueous phase soft mould plate method

A soft template method and nanoparticle technology, which is applied in the field of preparing gold nanoparticles by the aqueous phase reduction process, can solve the problems of difficult product separation, easy side reactions, and easy pollution, and achieve cost reduction, less impurities, and easy operation Effect

Inactive Publication Date: 2007-08-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is prone to side reactions, complex operation and difficult product separation, and easy to cause pollution
Polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS) used in the present invention can self-assemble to form soft clusters in aqueous solution; through the effect of soft template, make gold nanoparticles self-assemble to form respectively have narrow Distributed gold nanoparticles of specific shapes such as spheres, flakes, rings or arcs have not been reported at home and abroad.

Method used

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  • Process for preparing gold nano particle by using aqueous phase soft mould plate method

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1 SDS-PEG (PEG average molecular weight 8000) soft template synthesis of gold nanospheres.

[0016] Add a certain amount of PEG and SDS to deionized water, heat to 40-60°C to fully dissolve and self-assemble into soft clusters, and mix with the aqueous solution containing chloroauric acid after the solution is cooled to room temperature, so that each The final concentrations of the components are respectively: 0.1 mmol / L of chloroauric acid, 60 g / L of PEG, and 5 mmol / L of SDS. After stirring for about 1min (400r / min) at room temperature and normal pressure, react at around room temperature (25±1)°C in the dark for 2-6h. After the reaction, the reaction solution was centrifuged with a high-speed centrifuge (10000r / min) to separate the product, and the precipitate was washed three times with deionized water to obtain spherical gold nanoparticles with an average particle size of 20±5nm.

Embodiment 2

[0017] Example 2 SDS-PEG (PEG average molecular weight: 20,000) soft template was used to synthesize gold nanosheets.

[0018] Add a certain amount of PEG and SDS to deionized water, heat to 40-60°C to fully dissolve and self-assemble into soft clusters, and mix with the aqueous solution containing chloroauric acid after the solution is cooled to room temperature, so that each The final concentrations of the components are respectively: 0.5mmol / L of chloroauric acid, 85g / L of PEG, and 10mmol / L of SDS. After stirring for about 1min (400r / min) at room temperature and normal pressure, react at around room temperature (25±1)°C in the dark for 24-48h. After the reaction, the reaction solution was centrifuged with a high-speed centrifuge (3000r / min) to separate the product, and the precipitate was washed three times with deionized water to obtain gold nanosheets with an average diameter of 500±50nm.

Embodiment 3

[0019] Example 3 Synthesis of gold nanorings using SDS-PEG (average PEG molecular weight: 10,000) soft template.

[0020] Add a certain amount of PEG and SDS to deionized water, heat to 40-60°C to fully dissolve and self-assemble into soft clusters, and mix with the aqueous solution containing chloroauric acid after the solution is cooled to room temperature, so that each The final concentrations of the components are respectively: 0.3mmol / L of chloroauric acid, 120g / L of PEG, and 3mmol / L of SDS. After stirring at room temperature and normal pressure for about 1min (400r / min), react at around room temperature (25±1)°C in the dark for 180-240h. After the reaction, the reaction solution was centrifuged with a high-speed centrifuge (3000r / min) to separate the product, and the precipitate was washed three times with deionized water to obtain gold nanorings with an average diameter of 500±50nm.

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Abstract

A method for preparing gold nanometer particles via water-phase soft template method uses water-phase soft template method, the soft group formed by carbowax (PEG) and dodecyl sodium sulfate (SDS) as soft template, mixes the water solution of chlorauric acid (HAuCl4) and said soft group, uses PEG as reducer to reduce the gold ion into gold nanometer particles in special shape and size. In reaction, the soft template and reaction period can control the size and shape of gold nanometer particles. And the reactant via high-speed eccentric treatment, deposition and washed via water to obtain the gold nanometer ball, tablet, ring or arc. The invention is characterized in narrow size and size distribution, with simple operation on shape control.

Description

technical field [0001] The invention discloses a method for preparing gold nanoparticles by an aqueous phase soft template method, which belongs to the technical field of preparing nanoparticles in metal materials. The invention relates to a soft cluster formed with polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS) as a soft template, polyethylene glycol as a reducing agent, and chloroauric acid (HAuCl 4 ) as a raw material, the method for preparing gold nanoparticles by an aqueous phase reduction process, the gained gold nanoparticles can be nanospheres, nanosheets, nanorings or nanoarcs. Background technique [0002] Gold nanoparticles with special shapes, such as spheres, flakes, rings or arc-shaped particles, are more and more widely used in catalysis, biomedicine and optoelectronic devices, especially in molecular labeling, chemical sensing, nanoelectronic devices, etc. Great application value. For example, the current method for preparing gold nanorings at h...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 方云夏咏梅王纯荣
Owner JIANGNAN UNIV
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