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A kind of silver nanoflower composite graphene SERS substrate and its preparation method and application

A composite graphene and silver nanotechnology, applied in the field of SERS substrates, can solve problems such as complexity, environmental pollution, and waste of raw materials for production, and achieve the effects of increasing the density of hot spots, controlling the growth quality, and increasing the specific surface area

Inactive Publication Date: 2021-11-09
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems in the above-mentioned prior art that the process of preparing nanostructures with high "hot spot" density by growing noble metals such as silver is too complicated, the yield is low, and it is easy to cause waste of production raw materials and environmental pollution, the present invention aims to provide a A kind of silver nanoflower composite graphene SERS substrate and its preparation method and application

Method used

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  • A kind of silver nanoflower composite graphene SERS substrate and its preparation method and application
  • A kind of silver nanoflower composite graphene SERS substrate and its preparation method and application
  • A kind of silver nanoflower composite graphene SERS substrate and its preparation method and application

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Embodiment 1

[0045] refer to figure 1 , a preparation method of silver nanoflower composite graphene SERS substrate, comprising the steps of:

[0046] 1, the preparation of graphene film, comprises the steps:

[0047] (1) Cleaning of copper foil: first use acetone, hydrochloric acid (HCl: H 2 O=1:20) wash three times; then wash three times with deionized water;

[0048] (2) Put the cleaned copper foil in the quartz tube, when the vacuum degree in the quartz tube reaches 3×10 -3 During Torr, the flow rate of hydrogen is 50 sccm, and when the temperature in the quartz tube rises to 1000°C, then the flow rate of methane is 50 sccm. After the quartz tube is cooled to room temperature, a copper foil with a graphene film is obtained; the purity of the methane and hydrogen is higher than 99.99%;

[0049] (3) the copper foil that is attached to the graphene film obtained in step (2) is placed and cut into some small pieces of 15mm * 10mm, then it is put into the ferric chloride solution of 0.2...

Embodiment 2

[0055] refer to figure 1 , a preparation method of silver nanoflower composite graphene SERS substrate, comprising the steps of:

[0056] 1, the preparation of graphene film, comprises the steps:

[0057] (1) Cleaning of copper foil: first use acetone, hydrochloric acid (HCl:H 2 O=1:20) wash three times; then wash three times with deionized water;

[0058] (2) Put the cleaned copper foil in the quartz tube, when the vacuum degree in the quartz tube reaches 3×10 -3 During Torr, the flow rate of hydrogen is 50 sccm, and when the temperature in the quartz tube rises to 1000°C, then the flow rate of methane is 50 sccm. After the quartz tube is cooled to room temperature, a copper foil with a graphene film is obtained; the purity of the methane and hydrogen is higher than 99.99%;

[0059] (3) the copper foil that is attached to the graphene film obtained in step (2) is placed and cut into some small pieces of 15mm * 10mm, then it is put into the ferric chloride solution of 0.20...

Embodiment 3

[0065] refer to figure 1 , a preparation method of silver nanoflower composite graphene SERS substrate, comprising the steps of:

[0066] 1, the preparation of graphene film, comprises the steps:

[0067] (1) Cleaning of copper foil: first use acetone, hydrochloric acid (HCl:H 2 O=1:20) wash three times; then wash three times with deionized water;

[0068] (2) Put the cleaned copper foil in the quartz tube, when the vacuum degree in the quartz tube reaches 3×10 -3 During Torr, the flow rate of hydrogen is 50 sccm, and when the temperature in the quartz tube rises to 1000°C, the flow rate of methane is 50 sccm. When the methane is passed for 30 minutes, the flow of methane is stopped, and the hydrogen is turned off when the temperature in the quartz tube drops to 230°C. After the quartz tube is cooled to room temperature, a copper foil with a graphene film is obtained; the purity of the methane and hydrogen is higher than 99.99%;

[0069] (3) the copper foil that is attache...

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Abstract

The invention belongs to the technical field of SERS substrates, in particular to a silver nanoflower composite graphene SERS substrate and a preparation method and application thereof. The structure of the SERS substrate is as follows: a conductive electrode is arranged at both ends of a surface of the substrate, a groove is formed between the two conductive electrodes and the substrate, and the grooves are distributed sequentially from bottom to top: the first layer of graphene, The first layer of silver nanoflowers, the second layer of graphene, and the second layer of silver nanoflowers, the first and second layers of silver nanoflowers are grown on the first and second layers of graphene respectively, and the second layer of graphene grows On the first layer of silver nanoflowers. The graphene between the two layers of silver nanoflower structure of the SERS substrate designed by the present invention forms a coupled electromagnetic enhancement region, which can significantly increase the density of "hot spots" on the surface of the material, and the silver nanostructure at the bottom causes the graphene covering its surface The undulating wrinkled morphology increases the specific surface area of ​​the material surface and provides more binding sites for the molecules to be tested.

Description

technical field [0001] The invention belongs to the technical field of SERS substrates, and in particular relates to a silver nanoflower composite graphene SERS substrate and a preparation method and application thereof. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and it is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] At present, environmental pollution, product pollution such as pesticide residues, and various diseases (such as cancer) caused by them are becoming more and more serious, which have aroused people's widespread concern. However, the existing detection methods are high in cost and long in cycle, and it is difficult to meet the needs of rapid sampling in practical applications. Therefore, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 杨诚吕可满宝元
Owner SHANDONG NORMAL UNIV
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