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Film formed by silver nanosheets and preparation method and application of film

A technology of silver nanosheets and nanosheets, which is applied in the field of thin films composed of silver nanosheets and its preparation, can solve the problems such as the preparation method does not disclose the composition of the electrolyte, the silver nanosheets have no morphology and size, and the final product cannot be obtained.

Inactive Publication Date: 2013-05-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are deficiencies in both the final product and its preparation method. First, the disclosed final product, especially the silver nanosheets therein, has no specific morphology and size. It is only known that the final product is made of silver nanosheets. It is unknown whether the final product has a surface-enhanced Raman scattering (SERS) effect; second, the preparation method does not disclose the composition of the electrolyte, making it impossible for people to implement it to obtain the final product

Method used

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  • Film formed by silver nanosheets and preparation method and application of film
  • Film formed by silver nanosheets and preparation method and application of film
  • Film formed by silver nanosheets and preparation method and application of film

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Embodiment 1

[0031] The concrete steps of preparation are:

[0032] Step 1, the silver nitrate aqueous solution that concentration is 8g / L, the citric acid aqueous solution that concentration is 6g / L and water are mixed according to the ratio of 1.8:1.1:96 according to the volume ratio and then stirred for 2min; Wherein, water is deionized water, to obtain a mixture. Then inject a sodium borohydride aqueous solution with a concentration of 0.7g / L into the mixed solution and stir for 10 minutes, then age at room temperature for 20 hours to obtain a silver crystal solution; wherein, the silver nitrate aqueous solution and the sodium borohydride aqueous solution in the silver crystal solution are The volume ratio between them is 1.1:0.9.

[0033] Step 2, after first coating the silver crystal solution on the conductive substrate, place it at 35°C to evaporate the water in the solution; wherein, the coating is spin coating (or spray coating, or dipping), and the conductive substrate is conduc...

Embodiment 2

[0035] The concrete steps of preparation are:

[0036] Step 1, first mix the aqueous solution of silver nitrate with a concentration of 9g / L, the aqueous solution of citric acid with a concentration of 6.5g / L and water according to the volume ratio of 1.9:1.05:97 and stir for 3 minutes; wherein, the water is deionized water , to obtain a mixture. Then inject a sodium borohydride aqueous solution with a concentration of 0.75g / L into the mixed solution and stir for 11 minutes, then age at room temperature for 20.5 hours to obtain a silver crystal solution; wherein, the silver nitrate aqueous solution and sodium borohydride in the silver crystal solution The volume ratio between the aqueous solutions is 1.05:0.95.

[0037] Step 2, after first coating the silver crystal solution on the conductive substrate, place it at 38°C to evaporate the water in the solution; wherein, the coating is spin coating (or spray coating, or dipping), and the conductive substrate is conductive glass...

Embodiment 3

[0039] The concrete steps of preparation are:

[0040] Step 1, the silver nitrate aqueous solution that concentration is 10g / L, the citric acid aqueous solution that concentration is 7g / L and water are mixed according to the ratio of 2:1:98 according to the volume ratio and then stirred for 4min; Wherein, water is deionized water, to obtain a mixture. Then inject a sodium borohydride aqueous solution with a concentration of 0.8g / L into the mixed solution and stir for 12 minutes, then age at room temperature for 21 hours to obtain a silver crystal solution; wherein, the silver nitrate aqueous solution and the sodium borohydride aqueous solution in the silver crystal solution are The volume ratio between them is 1:1.

[0041] Step 2, after first coating the silver crystal solution on the conductive substrate, place it at 40°C to evaporate the water in the solution; wherein, the coating is spin coating (or spray coating, or dipping), and the conductive substrate is conductive g...

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Abstract

The invention discloses a film formed by silver nanosheets and a preparation method and application of the film. The film is 200-500nm in thickness and is formed by covering a nanometer flat branch cluster on a conductive substrate, wherein a gap between every two nanometer flat branches in the cluster is 1-15nm; and the film is formed by connecting nanosheets with arc-shaped edges in series, wherein the thickness of each nanosheet is 10-50nm, width is 30-300nm and length is 90-150nm. The preparation method comprises the following steps of: mixing and stirring a silver nitrate water solution, a citric acid water solution and water to obtain a mixed solution, and injecting a sodium borohydride water solution into the mixed solution and stirring and aging to obtain a silver seed crystal solution; then coating the silver seed crystal solution onto the conductive substrate and then airing the conductive substrate; and then putting the conductive substrate which is coated with silver seed crystals and is used as a cathode in electrolyte consisting of the silver nitrate water solution and the citric acid water solution, and carrying out electro-deposition for 5-120 minutes under the constant current of which the current density is 0.1-1mA / cm<2> to obtain the target product. The film disclosed by the invention can be used as an SERS (Surface Enhanced Raman Scattering) active substrate to rapidly detect the content of trace rhodamine 6G or tetrachlorobiphenyl-77 attached onto the SERS active substrate.

Description

technical field [0001] The invention relates to a thin film and its preparation method and application, in particular to a thin film composed of silver nanosheets and its preparation method and application. Background technique [0002] Nano-scale metallic silver has unique properties that are significantly different from similar bulk materials. People have made unremitting efforts to explore and expand its application range. A "device for observing electrochemical growth of nanomaterials and its control method" mentioned in the publication specification CN 101597785A of a Chinese invention patent application. This specification describes a thin film composed of silver nanosheets obtained by using the above-mentioned device and its preparation method, wherein the thin film is composed of silver nanosheets covered on an indium tin oxide conductive substrate, and the preparation method adopts an electrochemical method. The selected electrolyte is silver electrolyte, the anode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/02C30B29/64C30B30/02C25C5/02B82Y40/00B82Y30/00G01N21/65
Inventor 朱储红孟国文
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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