A method for rapid preparation of three-dimensional porous gold-silver alloy nanomaterials

A technology of three-dimensional porous and nanomaterials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high reaction temperature, difficulty in achieving uniform element ratio, and numerous steps to achieve preparation The process is simple and easy to operate, the preparation time is shortened, and the effect of monodispersity is good

Active Publication Date: 2019-04-09
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid phase reduction method has the advantages of simple reaction device and highly adjustable element ratio, but it is difficult to completely fuse the two elements of gold and silver in the gold-silver alloy prepared by this method, resulting in a gold-rich or silver-rich alloy Structure, element ratio uniformity is difficult to achieve
High-temperature alloying usually requires a reaction temperature higher than 600 ° C. The two elements of gold and silver can be perfectly melted to obtain a fully alloyed gold-silver structure. However, this method has a high reaction temperature and a long reaction time. The reaction is carried out under the protection of the atmosphere, which is not easy to operate, and in order to prevent the fusion between the particles, a layer of silica protective layer is usually coated on the surface of the nanoparticles, and there are many steps
In the prior art, people have not been able to solve the above-mentioned problems encountered in the process of alloying gold and silver through effective strategies, which largely limits the application of this type of gold-silver alloy nanoparticles

Method used

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  • A method for rapid preparation of three-dimensional porous gold-silver alloy nanomaterials
  • A method for rapid preparation of three-dimensional porous gold-silver alloy nanomaterials
  • A method for rapid preparation of three-dimensional porous gold-silver alloy nanomaterials

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preparation example Construction

[0024] Step A, add silver nitrate and ascorbic acid to the gold nanometer octahedral colloidal solution, make the concentration of silver nitrate in the liquid after mixing be 0.002~0.005mol / L, the concentration of ascorbic acid be 0.005~0.02mol / L, and in 50~80 °C for 30 minutes to prepare a colloidal solution of gold@silver nanocubes. Wherein, the gold nano-octahedral colloidal solution is a gold nano-octahedral colloidal solution prepared in an ethylene glycol system. In practical application, the preparation method of the described gold nano-octahedral colloidal solution includes: adding chloroauric acid and polydiallyldimethylammonium chloride with a molecular weight of 100,000 to 200,000 to the ethylene glycol solution, mixing The concentration of chloroauric acid in the final liquid is 0.0001-0.005 mol / liter, the concentration of polydiallyl dimethyl ammonium chloride is 0.005-0.2 mol / liter, and then react at 180-220°C for 1-5 hour, thereby making gold nano-octahedral c...

Embodiment 1

[0036] like Image 6 Shown, a kind of three-dimensional porous gold-silver alloy nano material, its preparation method comprises the following steps:

[0037] Step a1, adding chloroauric acid and molecular weight to 60 milliliters of ethylene glycol solutions is the polydiallyl dimethyl ammonium chloride (Mw=100000~200000, 20wt%) of 100000~200000, makes the chlorine in the liquid after mixing The concentration of gold acid is 0.0005 mol / liter, the concentration of polydiallyl dimethyl ammonium chloride is 0.025 mol / liter, then heated and reacted in an oil bath at 220°C for 1 hour, and naturally cooled to room temperature, thereby producing A gold nano-octahedral colloidal solution was obtained.

[0038] Step b1, under the condition of stirring at room temperature, add silver nitrate and ascorbic acid to the gold nano octahedral colloidal solution, so that the concentration of silver nitrate in the mixed liquid is 0.002~0.005mol / L, and the concentration of ascorbic acid is 0.0...

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Abstract

The invention discloses a method for rapidly preparing a three-dimensional porous gold-silver alloy nanometer material, which comprises the following steps: adding silver nitrate and ascorbic acid into a gold nano octahedral colloidal solution and reacting for 30 minutes under the condition of 50-80 DEG C so as to prepare a gold@silver nano cubic colloidal solution; uniformly mixing the gold@silver nano cube cubic colloidal solution with deionized water under the action of stirring and irradiating with a laser with a power of 670-680 volts for 60 -90 seconds so as to prepare a gold-silver alloy nanosphere colloidal solution; adding nitric acid into the gold-silver alloy nanosphere colloidal solution and reacting for 0.5-hours to obtain the three-dimensional porous gold-silver alloy nanometer material. The method not only can rapidly prepare the three-dimensional porous gold-silver alloy nanomaterial at room temperature and greatly shorten the preparation time, but also realizes the complete alloying of gold and silver elements; the three-dimensional porous gold-silver alloy nanomaterial has uniform size, large specific surface area, and good monodispersity; the preparation processis simple and easy to operate.

Description

technical field [0001] The invention relates to the field of three-dimensional porous gold-silver alloy nanomaterials, in particular to a method for rapidly preparing three-dimensional porous gold-silver alloy nanomaterials. Background technique [0002] Gold and silver nanomaterials have unique optical and catalytic properties, especially localized surface plasmon resonance, which makes gold and silver nanomaterials widely used in bioimaging, drug delivery, optical sensing, catalysis, surface-enhanced Raman scattering, etc. fields have wide application. Studies have shown that the surface plasmon resonance properties of gold and silver nanomaterials largely depend on the size, shape and element ratio of the metal. Gold-silver alloys have good optical properties, chemical stability, and electronic synergistic effects, which make them more widely used. Compared with nanoparticles with regular morphology, porous gold-silver alloy nanoparticles have the characteristics of lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 李越张涛孙一强杭立峰刘迪龙
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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