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Three-dimensional metal-graphene composite substrate and preparation method thereof

A graphene composite and graphene layer technology is applied in the field of surface-enhanced Raman substrate and its preparation based on a three-dimensional metal-graphene composite structure, which can solve the problem that the shape and size are difficult to control, the Raman signal is weak, and the signal interference is enhanced. and other problems, to achieve the effect of saving chemical reagents and preparation procedures, enhancing Raman scattering intensity, and good biocompatibility

Inactive Publication Date: 2013-06-26
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of the chemical redox roughening method is simple, but the surface of the electrode formed is uneven, and the shape and size are not easy to control; the shape and size of the chemically synthesized sol nanoparticles can be controlled, and the enhancement effect is very good, but the added surface Reagents interfere with the enhanced signal, and the preparation process is cumbersome, often requiring multiple centrifugations to remove excess impurities
The template method can obtain an ordered nanoparticle array, but the cost is high, the preparation is more complicated, and the Raman signal is relatively weak

Method used

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  • Three-dimensional metal-graphene composite substrate and preparation method thereof
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  • Three-dimensional metal-graphene composite substrate and preparation method thereof

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Embodiment 1

[0036] In this embodiment, the three-dimensional metal-graphene composite substrate of the present invention is prepared according to the following steps:

[0037] (1) The amorphous carbon film was ultrasonically cleaned with acetone, ethanol, and ultrapure water in sequence, each solution was cleaned for 5 minutes, and dried for electrochemical deposition of gold nano-layers.

[0038] (2) Deposit a gold nanoparticle layer on the surface of the amorphous carbon film by electrochemical deposition, and the electrodeposition solution used is 20ml 0.6 mmol / L HAuCl 4 with 0.075 mol / L KH 2 PO 4 mixed aqueous solution. A three-electrode system was adopted: the amorphous carbon film was used as the working electrode, the platinum sheet was used as the auxiliary electrode, and the saturated calomel electrode was used as the reference electrode. The model of the electrochemical workstation is CHI630D, the working mode is the constant potential mode, and the deposition is at -0.8V for...

Embodiment 2

[0044] In this embodiment, the three-dimensional metal-graphene composite substrate is prepared according to the following steps:

[0045] (1) Electrochemical deposition of silver nano-layers is carried out on the surface of the amorphous carbon film after cleaning in step (1) of Example 1, and the electrodeposition solution is 3mmol / L AgNO 3 with 0.375mol / L KNO 3 Mix the aqueous solution. A three-electrode system is adopted: the amorphous carbon film is used as the working electrode, the platinum sheet is used as the auxiliary electrode, and the saturated calomel electrode is used as the reference electrode. The model of the electrochemical workstation is CHI630D, the working mode is the constant potential mode, and the deposition is at -0.3V for 1200 seconds. Samples were dried for later use.

[0046] (2) Graphene oxide is spin-coated on the above-mentioned prepared sample by using a spin coater. The specific process is as follows: take 80uL of 1mg / mL graphene oxide, dr...

Embodiment 3

[0051] In this embodiment, the three-dimensional metal-graphene composite substrate is prepared according to the following steps:

[0052] (1) Deposit a gold nano-layer on the surface of the amorphous carbon film by electrochemical deposition, and the electrodeposition solution is 2.4 mmol / L HAuCl 4 with 0.075 mol / L KH 2 PO 4 mixed aqueous solution. A three-electrode system was adopted: the amorphous carbon film was used as the working electrode, the platinum sheet was used as the auxiliary electrode, and the saturated calomel electrode was used as the reference electrode. The model of the electrochemical workstation is CHI630D, the working mode is the constant potential mode, and the deposition is at -0.5V for 600 seconds. After the deposition is complete, the samples are dried and ready for use.

[0053] (2) Graphene oxide is spin-coated on the above-mentioned prepared sample by using a spin coater. The specific process is as follows: Take 40 μL of 0.5 mg / mL graphene ox...

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Abstract

The invention discloses a three-dimensional metal-graphene composite substrate and a preparation method thereof. The composite substrate disclosed by the invention is composed of a first nano layer, a graphene layer and a second nano layer, wherein the first nano layer is deposited on the surface of an amorphous carbon underlayer, the graphene layer is arranged on the surface of the first nano layer through spin coating, the second nano layer is deposited on the surface of the graphene layer, and the first nano layer and the second nano layer are gold or silver nano layers. According to the method, an active substrate with a good surface enhanced Raman effect is constructed; and the three-dimensional metal-graphene composite substrate is simple in preparation method, high in efficiency, and low in preparation cost.

Description

technical field [0001] The invention relates to a nanoparticle composite material and a preparation method, especially based on a three-dimensional metal-graphene composite structure as a surface-enhanced Raman substrate and a preparation method thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS), as a highly sensitive and powerful spectroscopic technique with single-molecule recognition, has proven to have important applications in the fields of analytical chemistry and biomedicine, especially for the detection of biomolecules. For the enhancement mechanism of surface-enhanced Raman scattering, there are two main mechanisms: one is the electromagnetic field enhancement mechanism based on surface plasmon resonance, and the other is the chemical enhancement mechanism based on charge transfer. The detection technology of surface-enhanced Raman spectroscopy can effectively overcome the shortcoming of the detection signal of ordinary Raman spectros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/52
Inventor 刘爱萍许涛赵廷玉赵明汤建任青华
Owner ZHEJIANG SCI-TECH UNIV
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