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Preparation method of hollow gold nanometer cage

A gold nano cage and hollow technology, applied in the nano field, can solve the problems of difficult reaction control, cumbersome preparation process and high cost, and achieve the effects of easy reaction control, simple process and reduction of the use of reagents.

Inactive Publication Date: 2011-08-17
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, these two preparation methods all need to prepare silver nanocubes, and silver nanocubes need to be prepared under high temperature and organic phase conditions, and the reaction is difficult to control
At the same time, both of these two preparation methods require post-processing operations, resulting in cumbersome preparation processes and high costs. For example, when using the Galfarni reduction method to prepare hollow gold nanocages, the product needs to be fully washed to remove impurities; In the electrochemical deposition method, it is necessary to remove the silver nanocube template, etc.

Method used

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  • Preparation method of hollow gold nanometer cage
  • Preparation method of hollow gold nanometer cage
  • Preparation method of hollow gold nanometer cage

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preparation example Construction

[0030] The invention provides a method for preparing a hollow gold nanocage, comprising:

[0031] Dissolving chloroauric acid, hexamethylenetetramine and protective agent in water to obtain a growth solution;

[0032] Taking the growth solution, adding a reducing agent and gold nanoparticles, and mixing uniformly to obtain a gold seed solution;

[0033] Taking the growth solution, adding silver salt and reducing agent, and mixing evenly to obtain a mixed solution;

[0034] The gold seed solution is added into the mixed solution, and left to stand for reaction to obtain hollow gold nanocages.

[0035] According to the present invention, at first with chloroauric acid (HAuCl 4 ), hexamethylenetetramine (HMT) and protective agent as raw materials and water as solvent to prepare growth solution. Wherein, the HMT as a ligand and the HAuCl 4 Au in 3+ Complexation occurs to form a complex with a spatial structure to provide a growth environment for the growth of gold nanoparticl...

Embodiment 1

[0055] Gold nanoparticles were prepared as follows:

[0056] Dissolve 0.25mmol sodium citrate in 1L of ultrapure water to obtain a 0.25mmol / L sodium citrate aqueous solution, which is stored in an ice-water bath; 9.5mg sodium borohydride is dissolved in 25mL of the lemon Sodium citrate aqueous solution, obtain the first mixed solution; 0.05mmol chloroauric acid is dissolved in the described sodium citrate aqueous solution of 200mL, obtain the second mixed solution; The first mixed solution of 0.6mL is joined in the second mixed solution of 20mL, Stir vigorously to obtain gold nanoparticles.

[0057] Characterization analysis is carried out to described gold nanoparticle, the result sees figure 2 , image 3 and Figure 4 , figure 2 The ultraviolet-visible spectrum figure of the gold nanoparticle sol prepared for the embodiment of the present invention; image 3 Atomic force morphology characterization of gold nanoparticles prepared for the embodiments of the present inve...

Embodiment 2

[0059] Follow the steps below to synthesize hollow gold nanocages:

[0060] Dissolve 0.25mmol of chloroauric acid, 0.1mol of HMT and 0.1mol of PVP in 1L of ultrapure water to obtain a growth solution; add 9mL of the growth solution to four beakers of A, B, C, and D respectively, and then add Add 50 μL 0.08mol / L vitamin C aqueous solution to C, add 100 μL 0.01mol / L silver nitrate solution and 50 μL 0.08mol / L vitamin C aqueous solution to D; 1 mL gold nanoparticles prepared in Example 1 are added to In A, mix evenly; take 1mL of the solution in A and add it to B, mix evenly; take 1mL of the solution in B and add it to C, mix evenly; take 1mL of the solution in LC and add it to D, after standing for 12 hours, a hollow Gold nanocages.

[0061] The hollow gold nanocage is characterized and analyzed, the results can be found in Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , Figure 5 The field emission scanning electron microscope image of the hollow gold nanoc...

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Abstract

The invention provides a preparation method of a hollow gold nanometer cage, comprising the following steps: dissolving chloroauric acid, hexamine, and a protecting agent in water to prepare a growing liquid; getting the growing liquid and adding in a reducing agent and gold nanometer particle and mixing well to prepare gold seed solution; getting the growing liquid, adding in silver salt and thereducing agent, mixing well to prepare a mixed solution; adding the gold seed solution in the mixed solution, standing and reacting to prepare the hollow gold nanometer cage. The method provided by the invention directly enables the gold nanometer particle to grow into the hollow gold nanometer cage in water phase at normal temperature; besides, the process is simple, the reaction is easy to control, and the efficiency is high. Simultaneously, the preparation method has no need of performing post treatment to the product, thereby reducing the use amount of the reagent, reducing the productioncost and simplifying the operation steps.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a method for preparing a hollow gold nanocage. Background technique [0002] Hollow gold nanocages not only have the characteristics of high specific surface area and low density, but also have different physical and chemical properties from non-hollow metal nanomaterials, especially good optical and catalytic properties, such as: in the Suzuki coupling reaction and methyl red The hollow gold nanocages have high catalytic performance similar to that of palladium nanotubes and palladium-gold-silver nanocages in the hydrogenation reaction of Azo dyes; in the photodegradation process of Azo azo dyes, the hollow gold nanocages exhibited specific photocatalysts. Better catalytic performance of titanium dioxide and zinc oxide. In addition, controlling the thickness of the hollow gold nanocage can shift the localized surface plasmon resonance peak to 800nm-900nm, which is close to the "ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B01J23/52B01J35/00
Inventor 李壮张悦唐小风许富刚孙玉静刘哲林石岩
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES