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A method for preparing au-ag core-shell nanoparticles under visible light

A nanoparticle and visible light technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor uniformity of Au-Ag core-shell nanoparticles and achieve excellent catalytic performance, The effect of uniform particle size and simple process

Active Publication Date: 2016-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the currently reported methods for preparing Au-Ag core-shell nanoparticles, the preparation of Au nanoparticles usually needs to be carried out under heating or ultraviolet light conditions, and the uniformity of the obtained Au-Ag core-shell nanoparticles is not good.
However, there is no report on the method of preparing Au-Ag core-shell nanoparticles using the visible light method.

Method used

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  • A method for preparing au-ag core-shell nanoparticles under visible light
  • A method for preparing au-ag core-shell nanoparticles under visible light
  • A method for preparing au-ag core-shell nanoparticles under visible light

Examples

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Embodiment 1

[0024] 1) Mix 150 μL trisodium citrate aqueous solution (50 mM), 120 μL AgNO 3 Aqueous solution (1 mM) and 250 μL HAuCl 4 The aqueous solution (20 mM) was added to 19.48 mL of deionized water, and stirred rapidly for 5-10 min to mix the substances evenly to obtain a mixed solution;

[0025] 2) The above mixed solution was placed under a 350W xenon lamp (with a 420nm filter), and irradiated for 1 h while stirring to generate Au nanoparticles in the solution, and then 0.3 mL of trisodium citrate aqueous solution was added to the above solution. (50mM) under a 350W xenon lamp (with a 420nm filter) with stirring, and to this solution was added 0.1mL of AgNO dropwise 3 Aqueous solution (50 mM), after the addition is complete, continue to stir and illuminate for 1 h. After the reaction, the Au-Ag core-shell nanoparticles were obtained by post-treatment, and the particle size was about 27 nm.

[0026] like figure 1 Shown is a transmission electron microscope image of the Au nanop...

Embodiment 2

[0028] 1) Mix 150 μL trisodium citrate aqueous solution (50 mM), 120 μL AgNO 3 Aqueous solution (1 mM) and 250 μL HAuCl 4 The aqueous solution (20 mM) was added to 19.48 mL of deionized water, and stirred rapidly for 5-10 min to mix the substances evenly to obtain a mixed solution;

[0029] 2) The above mixed solution was placed under a 350W xenon lamp (with a 420nm filter), and irradiated for 1 h while stirring to generate Au nanoparticles in the solution, and then 0.3 mL of trisodium citrate aqueous solution was added to the above solution. (50mM) under a 350W xenon lamp (with a 420nm filter) with stirring, and to this solution was added 0.1mL of AgNO dropwise 3 Aqueous solution (50 mM), after the addition is complete, continue to stir and illuminate for 1 h. Repeat this process 2 times. After the reaction, the Au-Ag core-shell nanoparticles were obtained by post-treatment.

[0030] After testing, the average particle size of the Au nanoparticles prepared in this example...

Embodiment 3

[0033] 1) Mix 150 μL trisodium citrate aqueous solution (50 mM), 120 μL AgNO 3 Aqueous solution (1 mM) and 250 μL HAuCl 4 The aqueous solution (20 mM) was added to 19.48 mL of deionized water, and stirred rapidly for 5-10 min to mix the substances evenly to obtain a mixed solution;

[0034] 2) The above mixed solution was placed under a 350W xenon lamp (with a 420nm filter), and irradiated for 1 h while stirring to generate Au nanoparticles in the solution, and then 0.3 mL of trisodium citrate aqueous solution was added to the above solution. (50mM) under a 350W xenon lamp (with a 420nm filter) with stirring, and to this solution was added 0.1mL of AgNO dropwise 3 Aqueous solution (50 mM), after the addition is complete, continue to stir and illuminate for 1 h. Repeat this process 3 times. After the reaction, the Au-Ag core-shell nanoparticles were obtained by post-processing, and the particle size was about 35 nm.

[0035] After testing, the average particle size of the A...

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Abstract

The invention relates to a method for preparing Au-Ag (gold-silver) nuclear shell nano particles by visible light. The method includes: 1), evenly mixing a trisodium citrate aqueous solution, a silver nitrate aqueous solution and a chloroauric acid aqueous solution to obtain a mixed solution; 2), irradiating the mixed solution under a 350W xenon lamp for one hour, adding the trisodium citrate aqueous solution into the mixed solution under the irradiation of the xenon lamp, and adding the silver nitrate aqueous solution dropwise; 3), continuing to irradiate the mixed solution for one hour after the solution adding process to obtain the Au-Ag nuclear shell nano particles. According to the method, the Au-Ag nuclear shell nano particles are prepared by the visible light at the room temperature, technology is simple, and diameters of the prepared Au-Ag nuclear shell nano particles are uniform.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a method for preparing Au-Ag core-shell nanoparticles with visible light. Background technique [0002] Au and Ag nanoparticles have excellent physical and chemical properties, which make them have a wide range of applications in optics, electronics, catalysis and biomedicine. However, due to the synergistic effect of Au and Ag, Au-Ag core-shell nanoparticles have better performance than Au and Ag nanoparticles alone, so it is of great significance to study and prepare high-quality Au-Ag core-shell nanoparticles. [0003] At present, most of the reported methods for preparing Au-Ag core-shell nanoparticles are two-step methods. The first step is the preparation of Au nanoparticles, and the second step is the reduction of Ag on the surface of Au nanoparticles. Among them, the classical method for preparing Au nanoparticles is the reduction of HAuCl by sodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02B82Y40/00B82Y30/00
Inventor 傅正义谭铁宁王为民王皓王玉成张金咏张帆
Owner WUHAN UNIV OF TECH
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