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Silver nanoflower composite graphene SERS substrate, preparation method and application thereof

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

Active Publication Date: 2019-08-20
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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  • Silver nanoflower composite graphene SERS substrate, preparation method and application thereof
  • Silver nanoflower composite graphene SERS substrate, preparation method and application thereof
  • Silver nanoflower composite graphene SERS substrate, preparation method and application thereof

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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 and relates to a silver nanoflower composite graphene SERS substrate, a preparation method and application thereof. According to the structure of the SERS substrate, two electric conduction electrodes are arranged at two ends of one surface of a substrate respectively; a groove is formed between the two electric conduction electrodesand the substrate; a first graphene layer, a first silver nanoflower layer, a second graphene layer and a second silver nanoflower layer are sequentially distributed in the groove from bottom to top;the first silver nanoflower layer and the second silver nanoflower layer are respectively grown on the first graphene layer and the second graphene layer; and the second graphene layer is grown on thefirst silver nanoflower layer. According to the SERS substrate of the invention, the graphene formed between the two silver nanoflower layers forms a coupled electromagnetic enhanced region, so thatthe hot spot density of the surface of the material can be remarkably increased; and the silver nano-structure at the bottom enables the graphene coating the surface of the silver nano-structure to form a fluctuating fold-shaped form, and therefore, the specific surface area of the surface of the material is increased, and more binding sites are provided for molecules to be detected.

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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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 杨诚吕可满宝元
Owner SHANDONG NORMAL UNIV
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