Method for preparing hollow nano gold powder material

A technology of hollow nano-bulk materials, which is applied in the field of preparation of hollow nano-gold powder materials, can solve the problems of complex preparation process, complex operation process, poor versatility, etc., and achieve the effect of low cost and simple process

Inactive Publication Date: 2009-05-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method is relatively easy to obtain hollow nano-gold powder materials, the selection of templates is very important. The pore size of hollow nano-gold powder materials is directly affected by the particle size distribution of hard templates, and it also requires roasting, organic solvent dissolution or ch

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  • Method for preparing hollow nano gold powder material

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Effect test

Embodiment 1

[0016] Pass 300mL of deionized water through high-purity nitrogen to remove dissolved oxygen, add 31mg of sodium citrate and 340mg of sodium borohydride under stirring, so that the concentration of sodium citrate in the deionized water is 0.0004M, and the concentration of sodium borohydride is 0.03M. After stabilization, 224mg of cobalt acetate was added to make the concentration of cobalt acetate in deionized water 0.003M. The reaction system was always carried out under the protection of nitrogen. That is, cobalt nanoparticles with nanoscale were synthesized. Then continue to stir the reaction until the sodium borohydride in the system is completely consumed, add 247mg of chloroauric acid to make the concentration of chloroauric acid in deionized water 0.002M, and stir at room temperature for 6h. Finally, the product is centrifuged, washed, and vacuum-dried for 4 hours to obtain a hollow nano-gold powder material. The average particle size is 20nm and the inner diameter is...

Embodiment 2

[0018] Pass 300mL of deionized water through high-purity nitrogen to remove dissolved oxygen, add 39mg of sodium citrate, 680mg of sodium borohydride, and 448mg of cobalt acetate under stirring, so that the concentration of sodium citrate in the deionized water is 0.0005M, and the concentration of sodium borohydride is 0.06M, the concentration of cobalt acetate is 0.006M. The reaction system was carried out under the protection of nitrogen. That is, cobalt nanoparticles with nanoscale were synthesized. Then add 494mg of chloroauric acid to make the concentration of chloroauric acid in deionized water 0.004M, and stir at room temperature for 8h. Finally, the product was centrifuged, washed, and vacuum-dried for 6 hours to obtain a hollow nano-gold powder material. The average particle size is 35nm and the inner diameter is 29nm.

Embodiment 3

[0020] Pass 1000mL deionized water through high-purity nitrogen to get rid of dissolved oxygen, add sodium citrate 155mg, sodium borohydride 3404mg, cobalt acetate 2242mg under stirring, make the concentration of sodium citrate in deionized water be 0.0006M, the concentration of sodium borohydride is 0.09M, the concentration of cobalt acetate is 0.009M. . The reaction system was carried out under the protection of nitrogen. That is, cobalt nanoparticles with nanoscale were synthesized. Then add 2471mg of chloroauric acid to make the concentration of chloroauric acid in deionized water 0.006M, and stir at room temperature for 12h. Use sodium bicarbonate to adjust the pH value to 8. After the reaction is completed, the product is centrifuged, washed, and vacuum-dried for 10 hours to obtain a hollow nano-gold powder material. The average particle diameter is 50nm, and the inner diameter is 42nm.

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Abstract

The invention belongs to a method for preparing a hollow nano gold powder material. The method uses sodium borohydride, sodium citrate and sodium citrate as raw materials and selects cheap cobalt as a sacrificial template to prepare hollow nano gold powder material in scale. The method comprises the following steps: making the concentration of sodium citrate in de-ionized water between 0.0004 and 0.0006M and the concentration of sodium borohydride in the de-ionized water between 0.03 and 0.09M; adding cobalt acetate into the de-ionized water to make the concentration of cobalt acetate in the de-ionized between 0.003 and 0.009M; continuing stirring till the sodium borohydride in the reaction system are used up; adding the sodium citrate into the de-ionized water to make the concentration of the sodium citrate in the de-ionized water between 0.002 and 0.006M; stirring the de-ionized water with magnetic force at room temperature for 6 to 12h; centrifuging and washing products and performing vacuum drying on the products for 4 to 10h; and obtaining the hollow nano gold powder material which has an average grain diameter of between 20 and 50nm and a shell which is formed by piling gold particles with a diameter of between 2 and 4nm and is formed with a 5 to 8 nm of thick surrounding wall. The method is simple in process and low in cost and allows for batch production.

Description

technical field [0001] The invention belongs to a method for preparing a hollow nano-gold powder material. Background technique [0002] Gold nanomaterials with a hollow structure not only have the characteristics of high specific surface area and low density, but also have new physical and chemical properties compared with non-hollow metal nanomaterials. At the same time, noble metal nanoparticles with hollow structures can save the use of precious metals and reduce material the cost of. Therefore, research on the synthesis and application of metal nanoparticles with hollow structures has aroused great interest. At present, the preparation method of gold nanoparticles with hollow structure is mainly based on a template method (Chem. Mater. 2003, 15: 3176-3183, Chinese invention patent, CN 1730150A). Commonly used templates include mesoporous alumina, polyethylene nanospheres, silica spheres, and vesicles. In this method, gold is first reduced on these templates, and then...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24
Inventor 苏怡刘世伟华凯峰吕翔宇李翠玲王玉江
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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