Method for preparing hollow nano gold powder material

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...

AI Technical Summary

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 chemical reactions. method to remove the template, the preparation process of this method is complex

Therefore, mass production cannot be formed

Conventional techniques for preparing hollow nano-gold powder materials require relatively complicated operating techniques, which are not universal and have certain limitations.

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