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Dendritic golden nanophase material and preparation method thereof

A dendritic, gold nanotechnology, applied in the field of preparation of precious metal nanomaterials

Inactive Publication Date: 2009-09-23
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the research on dendritic noble metal nanomaterials has been at the peak of development, there is no good way to controllably manipulate the growth of dendrites by controlling the reaction parameters.

Method used

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  • Dendritic golden nanophase material and preparation method thereof
  • Dendritic golden nanophase material and preparation method thereof
  • Dendritic golden nanophase material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this embodiment, a multi-branched dendritic gold nanomaterial is prepared, the size range of which is 100-500 nanometers, such as Figure 1a with Figure 1b For the transmission electron microscope pictures of the dendritic gold nanostructures prepared, it can be seen that each gold branch of the dendritic gold nanomaterial is bonded and fused with each other through gold nanoparticles or forms a twin structure growth (see Figure 3a , Figure 3b , Figure 3c , Figure 3d ), there are nano-scale gaps between the gold branches, and the surface of the dendritic gold nanostructure is wrapped by polyvinylpyrrolidone polymer.

[0032] The specific preparation method includes the following steps:

[0033] (1) Choose chloroauric acid (HuAuCl4·3H2O) or chloroauric acid (MAuCl4·XH2O) for the reaction system, for example, chloroauric acid potassium; ammonium formate (Ammonium Formate) and stabilizer polyvinylpyrrolidone (PVP) , The three are reactants, and deionized water is the s...

Embodiment 2

[0038] In this embodiment, a few branched dendritic gold nanostructures are prepared, and the size range is 100-200 nanometers, such as Figure 2a with Figure 2b For the transmission electron microscope picture of the prepared dendritic gold nanostructures, it can be seen that each gold branch of the dendritic gold nanomaterial is bonded to each other by gold nanoparticles to form a twin structure growth (see Figure 2c , Figure 2d ), there are nano-scale gaps between the gold branches, and the surface of the dendritic gold nanostructure is wrapped by polyvinylpyrrolidone polymer.

[0039] The specific preparation method includes the following steps:

[0040] (1) The reaction system chooses chloroauric acid (HuAuCl4·3H2O) or sodium chloroauric acid, ammonium formate (Ammonium Formate) and polyvinylpyrrolidone (PVP) stabilizer as the reactants, and the water phase is the solvent; among them, chloroauric acid Or 0.18mmol of chloroauric acid, 0.2g of polyvinylpyrrolidone, 0.34g of ...

Embodiment 3

[0045] In this embodiment, preliminary branched gold nanostructures are prepared, and the size range is 100-200 nanometers, such as Figure 5a with Figure 5b For the transmission electron microscope pictures of the dendritic gold nanostructures prepared, it can be seen that each gold branch of the dendritic gold nanomaterial is bonded and fused with each other through gold nanoparticles or forms a twin structure growth (see Figure 5c , Figure 5d ), there are nano-scale gaps between the gold branches, and the surface of the dendritic gold nanostructure is wrapped by polyvinylpyrrolidone polymer.

[0046] The specific preparation method includes the following steps:

[0047] (1) The reaction system chooses three of chloroauric acid (HuAuCl4·3H2O) or chloroauric acid (MAuCl4·XH2O), ammonium formate (Ammonium Formate) and polyvinylpyrrolidone (PVP) stabilizer as the reactants, and the water phase is the solvent. ; Among them, chloroauric acid or chloroauric acid salt 0.18mmol, polyv...

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Abstract

The invention relates to a dendritic golden nanophase material and a preparation method thereof. The gold nanophase material is dendritic, and all golden branches are formed by mutually stuck and fused golden nano particles or formed in a twin-crystal structure for growing. The preparation method comprises the following steps: pure water is added with chloroauric acid or chloraurate, ammonium formate and polyvinyl-pyrrolidone stabilizer and then transferred to a hydro-thermal reaction vessel after even ultrasonic mixing; after heating is carried out for 1-6 hours, a black mixturei is obtained after natural cooling; and the obtained product naturally subsides for 24-48 hours with ethyl alcohol or acetone or centrifugally subsides for at least 30 minutes, and after the liquid on the upper layer is removed, the product is added with absolute ethyl alcohol or acetone for dilution, and the black dendritic golden nanophase material deposition is obtained after centrifugal settling; and the ethyl alcohol or acetone washing process is repeated for 2-3 times, and finally, the black dendritic golden nanophase material coated with the polyvinyl-pyrrolidone is obtained. The dendritic golden nanophase material can be used as a commercial catalyst, a surface enhanced Raman substrate material, and the like. The method has the advantages of simple process and device and safe operation; and large-scale production can be performed by the method.

Description

Technical field [0001] The invention relates to a method for preparing a noble metal nano material with a dendritic structure, in particular to a dendritic gold nano material and a method for directly preparing a dendritic gold nano material by adopting one-step hydrothermal synthesis. Background technique [0002] Nanomaterials with dendritic structures of precious metals (such as gold, silver, palladium, and platinum) have been highly regarded by researchers due to their applications in heterogeneous catalysis, high-sensitivity biosensors based on surface plasmons, biomarkers, and low-energy absorption. Wide attention. The dendritic structure can provide a large specific surface area and numerous small nano-scale gaps. This structural feature determines the superior catalytic and electromagnetic enhancement performance of this material. Recently, there have been reports on the preparation methods of dendritic gold and silver nanomaterials. For example, Document 1, Chen, SH; Wan...

Claims

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Application Information

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IPC IPC(8): C30B29/02C30B29/62C30B7/10B22F9/24C22B11/00
Inventor 江鹏葛广路唐新玲
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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