Three-dimensional porous gold-silver alloy nanometer material and preparation method and application thereof

A technology of three-dimensional porous and nanomaterials, applied in nanotechnology, nanotechnology, analytical materials, etc., can solve the problems of inability to obtain nanocube morphology and limit the application of nanomaterials, and achieve good monodispersity and stability, Strong signal repeatability and good stability

Active Publication Date: 2017-11-17
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] At present, the preparation method of porous gold-silver alloy nanoparticles with bicontinuous structure is generally to remove the more active silver element in gold-silver alloy through chemical or electrochemical process, but the bicontinuous structure constructed by this preparation method Porous gold-silver alloy nanoparticles are usually quasi-spherical, linear and other morpho

Method used

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  • Three-dimensional porous gold-silver alloy nanometer material and preparation method and application thereof
  • Three-dimensional porous gold-silver alloy nanometer material and preparation method and application thereof
  • Three-dimensional porous gold-silver alloy nanometer material and preparation method and application thereof

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preparation example Construction

[0035] Specifically, the preparation method of the three-dimensional porous gold-silver alloy nanomaterial may include the following steps:

[0036] Step A, adding silver nitrate 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 reacting at 180-220°C for 32-72 hours, and then centrifuging Separation, the rotational speed of centrifugation is 10000-14500 rev / min, after centrifugation for 30-100 minutes, remove the colorless solution in the centrifuge tube, and then add water to the khaki precipitate obtained by centrifugation to obtain gold@ Silver Nanocube Concentrate. Wherein, the amount of water used is determined according to the amount of the gold nano-octahedral colloidal solution in step A: 0.5-5 mL of water is used for every 10-100 mL of gold nano-octahedral colloidal solution. In practical application, the described gold nano-octahedral colloidal solution can adopt the gold nano-oct...

Embodiment 1

[0053] Such as figure 1 Shown, a kind of three-dimensional porous gold-silver alloy nano material, its preparation method comprises the following steps:

[0054] Step a1, add chloroauric acid and 1.2 milliliters of polydiallyl dimethyl ammonium chloride (Mw=100000~200000, 20wt%) that molecular weight is 100000~200000 in 60 milliliters of ethylene glycol solutions, make the liquid after mixing The concentration of chloroauric acid in the medium is 0.0005 mol / liter, and 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 making gold nano-octahedral colloidal solution (gold nano-octahedral wherein as figure 1 Indicated by the label 1).

[0055] Step b1, add 60 microliters of silver nitrate to 60 milliliters of gold nano-octahedral colloidal solution, remove the magnet after stirring evenly, and react in an oil bath at 220°C for 72 hours, th...

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Abstract

The invention discloses a three-dimensional porous gold-silver alloy nanometer material and a preparation method and application of the three-dimensional porous gold-silver alloy nanometer material. The three-dimensional porous gold-silver alloy nanometer material is a three-dimensional porous gold-silver alloy nanometer particle cube which is of a bicontinuous structure, the edge length of the three-dimensional porous gold-silver alloy nanometer particle cube is 40-100 nm, and the three-dimensional porous gold-silver alloy nanometer material is provided with multiple open holes. The preparation method of the three-dimensional porous gold-silver alloy nanometer material comprises the steps that silver nitrate is added to a gold nanometer octahedron colloidal solution, so that a gold-silver nanometer cube concentrated solution is prepared, fish sperm DNA and 4-mercaptopyridine are added to the gold-silver nanometer cube concentrated solution, so that gold-silver nanometer cube precipitates are prepared; a gold-silver-silicon dioxide colloidal solution is prepared, high-temperature annealing is conducted, and then a gold and silver alloy-silicon dioxide nanometer cubes are prepared; and silicon dioxide is removed through strong base, and etching is conducted until a part of the silver element is removed. The three-dimensional porous gold-silver alloy nanometer material has good dispersity and larger specific surface area and has the strong enhancement function on surface enhanced Raman scattering signals. The preparation method is high in productivity, simple in technological process and simple in operation.

Description

technical field [0001] The invention relates to the field of gold-silver alloy nanomaterials, in particular to a three-dimensional porous gold-silver alloy nanomaterial and its preparation method and application. Background technique [0002] Gold-silver alloy nanomaterials have the characteristic of localized surface plasmon resonance, which can produce a strong electromagnetic field enhancement effect, and can be widely used in biological imaging, optical sensing, catalysis, surface-enhanced Raman scattering and other fields. Bimetallic structures composed of two elements, gold and silver, have highly tunable element ratios, optical properties, and electronic synergistic effects for a wider range of applications, which has attracted great attention. [0003] In order to controllably obtain gold-silver bimetallic nanoparticles, various preparation methods such as chemical reagent reduction method, micelle and reverse micelle method, thermochemical method, photochemical meth...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24G01N21/65B82Y40/00B82Y30/00
CPCG01N21/658B82Y30/00B82Y40/00B22F9/24B22F1/145B22F1/054
Inventor 李越张涛杭立峰孙一强刘迪龙
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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