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Two-dimensional noble metal nanometer material and preparation method thereof

A technology of nanomaterials and precious metals, which is applied in the field of two-dimensional precious metal nanomaterials and its preparation, can solve problems such as difficult large-scale promotion and application, high raw material prices, and complicated preparation methods, and achieves easy industrial production, expanded application range, and raw materials. Kind of cheap and easy to get effects

Inactive Publication Date: 2009-10-28
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are deficiencies in this gold electrode with palladium nanoparticle film and its preparation method. First, the noble metal on the gold electrode is only a nanoparticle film, not a nanosheet, especially not a standing nanosheet; secondly, The use of gold electrodes as substrates is too expensive and difficult to promote and apply on a large scale; finally, the preparation method is complicated, the price of raw materials is high, and it pollutes the environment

Method used

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  • Two-dimensional noble metal nanometer material and preparation method thereof
  • Two-dimensional noble metal nanometer material and preparation method thereof
  • Two-dimensional noble metal nanometer material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The specific steps of preparation are: vapor-depositing a gold film on the surface of the substrate; wherein, the substrate is a semiconductor, and a silicon chip is used now, and the thickness of the gold film is 30nm. Then place it in the electrolyte as the cathode at 1μA / cm 2 Electrodeposition under the current of 7h, the electrolyte is prepared by the acid solution of the noble metal and polyvinylpyrrolidone according to the ratio of the concentration of 1g / L: 3g / L; wherein, the electrodeposition current is a constant current, the acid solution of the noble metal is silver nitrate solution, The polyvinylpyrrolidone is polyvinylpyrrolidone K30. Then it is washed and dried; wherein, the washing is washed twice with deionized water, and the drying is blown dry with nitrogen at normal temperature. thus making as figure 1 curves in the figure 2 and image 3 , and if Figure 4 a The two-dimensional noble metal silver nanomaterial shown in a.

Embodiment 2

[0020] The specific steps of preparation are: vapor-depositing a gold film on the surface of the substrate; wherein, the substrate is a semiconductor, and a silicon chip is used now, and the thickness of the gold film is 33nm. Then place it in the electrolyte as the cathode at 10μA / cm 2 Electrodeposition under the current of 6h, the electrolyte is prepared by the acid solution of the noble metal and polyvinylpyrrolidone according to the concentration ratio of 1g / L: 4g / L; wherein, the electrodeposition current is a constant current, the acid solution of the noble metal is a silver nitrate solution, The polyvinylpyrrolidone is polyvinylpyrrolidone K30. Then, it was washed and dried; wherein, the washing was washed twice with distilled water, and the drying was blown dry with nitrogen at room temperature. thus making as figure 1 curves in the figure 2 and image 3 , and approximately Figure 4 a The two-dimensional noble metal silver nanomaterial shown in a.

Embodiment 3

[0022] The specific steps of preparation are: vapor-depositing a gold film on the surface of the substrate; wherein, the substrate is a semiconductor, and a silicon wafer is used now, and the thickness of the gold film is 35nm. Then place it in the electrolyte as the cathode at 20A / cm2 Electrodeposition under the electric current of 5h, electrolyte is prepared by the ratio of the concentration of 1g / L: 5g / L by the acid solution of precious metal and polyvinylpyrrolidone; Wherein, electrodeposition current is constant current, the acid solution of precious metal is silver nitrate solution, The polyvinylpyrrolidone is polyvinylpyrrolidone K30. Then it is washed and dried; wherein, the washing is washed twice with deionized water, and the drying is blown dry with nitrogen at normal temperature. thus making as figure 1 curves in the figure 2 and image 3 , and if Figure 4 The two-dimensional noble metal silver nanomaterial shown in b.

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Abstract

The invention discloses a two-dimensional noble metal nanometer material and a preparation method thereof. The material comprises a substrate and a noble metal on the substrate; particularly, a gold film is covered on the substrate, vertical noble metal nanometer sheets are arranged on the substrate covered by the gold film and have the height of 0.5 microns to 1.5 microns, the width of 0.5 microns to 2.5 microns and the thickness of 15 nm to 25 nm, and the noble metal is metal gold, metal silver or metal platinum. The method comprises an electrodeposition method which comprises the following steps: firstly, depositing the gold film on the surface of the substrate; putting the substrate as a cathode into an electrolyte to electrolytically deposit for 3 hours to 7 hours under a current of 1 to 50 microampere / cm, wherein the electrolyte is prepared by an acid solution of the noble metal and polythene pyrrolidone according to the density of 1g / L:3 to 7g / L; and then, washing and drying to prepare the two-dimensional noble metal nanometer material. The product can be widely applied to the fields of biomedicine, diagnosis, and the like. The preparation method needs raw materials having fewer types and low cost and being easy to get, has simple technological process and no environmental pollution and is easy to realize the industrialized production.

Description

technical field [0001] The invention relates to a nanometer material and a preparation method thereof, in particular to a two-dimensional precious metal nanometer material and a preparation method thereof. Background technique [0002] The nanostructures of precious metals gold and silver have good biocompatibility and have a strong adsorption function for proteins. Noble metal nanostructures with different structures and shapes exhibit unique optical properties. For example, for nanoparticles, as the particle size increases, the SPR absorption peak position λ max Gradual red shift; for one-dimensional nanostructures, there are two absorption peaks, corresponding to the horizontal and vertical resonance absorption; for two-dimensional nanostructures, such as triangular nanosheets, there are often four absorption peaks. It is precisely because of the rich optical properties of the nanostructures of precious metals gold and silver that they have been applied in biomedicine an...

Claims

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Application Information

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IPC IPC(8): C25D3/50C25D5/00C25D7/00
Inventor 刘广强蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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