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Graphene/Au composite material with enhanced SERS activity

A composite material and graphene technology, applied in metal material coating technology, ion implantation plating, coating, etc., can solve the problems of large-scale implementation restrictions, high production costs, strong dependence on excitation light sources, etc., and achieve easy batch production Preparation, low cost, and the effect of enhancing signal strength

Pending Publication Date: 2020-08-04
青岛粲耀新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods provide good control over particle size and shape, they require high production costs and are limited in large-scale implementation.
[0004] In addition, in practical applications, users also found that only relying on the surface plasmon resonance properties of noble metal nanoparticles itself is very dependent on the excitation light source, so there are serious application limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of graphene / Au composite material with enhanced SERS activity, its preparation method is:

[0030] (1) Soak the silicon wafer in 1% sodium lauryl sulfate solution for 36 hours to make it hydrophilic;

[0031] (2) Take another silicon wafer and cut it to 2×2cm 2 After size, put it into a mixed solution of ammonia water, hydrogen peroxide and deionized water with a volume ratio of 1:2:6 and heat at 250°C for 10 minutes. After cooling, add deionized water and ethanol in order for ultrasound, and then put it into ethanol solution in standby;

[0032] (3) Take the ethanol solution of polystyrene microspheres and mix them according to the volume ratio of polystyrene balls and ethanol solution at 1:2, and then ultrasonicate to make them uniformly dispersed;

[0033] (4) Drop the above-mentioned polystyrene alcohol solution on a hydrophilic silicon wafer, spread the liquid evenly, insert it into the water at an angle, and spread the liquid on the water surface to form ...

Embodiment 2

[0038] A kind of graphene / Au composite material with enhanced SERS activity, its preparation method is:

[0039] (1) Soak the silicon wafer in 3% sodium lauryl sulfate solution for 12 hours to make it hydrophilic;

[0040] (2) Take another silicon wafer and cut it to 2×2cm 2 After size, put it into a mixed solution of ammonia water, hydrogen peroxide and deionized water with a volume ratio of 1:2:6 and heat at 350°C for 5 minutes. After cooling, add deionized water and ethanol in order for ultrasound, and then put it into ethanol solution in standby;

[0041] (3) Take the ethanol solution of polystyrene microspheres and mix them according to the volume ratio of polystyrene balls and ethanol solution at 1:0.5, and then ultrasonicate to make them uniformly dispersed;

[0042] (4) Drop the above-mentioned polystyrene alcohol solution on a hydrophilic silicon wafer, spread the liquid evenly, insert it into the water at an angle, and spread the liquid on the water surface to form...

Embodiment 3

[0047] A kind of graphene / Au composite material with enhanced SERS activity, its preparation method is:

[0048](1) Soak the silicon wafer in 2% sodium lauryl sulfate solution for 20 hours to make it hydrophilic;

[0049] (2) Take another silicon wafer and cut it to 2×2cm 2 After size, put it into a mixed solution of ammonia water, hydrogen peroxide and deionized water with a volume ratio of 1:2:6 and heat at 300°C for 7 minutes. After cooling, add deionized water and ethanol in order for ultrasound, and then put it into ethanol solution in standby;

[0050] (3) Take the ethanol solution of polystyrene microspheres and mix them according to the volume ratio of polystyrene spheres and ethanol solution at 1:1, then ultrasonicate to make them uniformly dispersed;

[0051] (4) Drop the above-mentioned polystyrene alcohol solution on a hydrophilic silicon wafer, spread the liquid evenly, insert it into the water at an angle, and spread the liquid on the water surface to form a si...

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PUM

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Abstract

The invention relates to a graphene / Au composite material. The graphene / Au composite material comprises a two-dimensional structure array template formed on a silicon wafer and formed by arranging polystyrene microspheres, Au and graphene are alternately deposited on the template, and the deposition thicknesses of the Au and the graphene are 50-100 nm and 2-10 nm respectively. A polystyrene colloidal sphere template with original micro-scale or micro-nano-scale roughness is used as a substrate, and an Au layer and a graphene layer are deposited through magnetron sputtering and electron cyclotron plasma sputtering respectively, so that the signal intensity of a detected probe molecule can be significantly enhanced, the dependence of the detected probe molecule on an excitation light sourceis overcome, and the application range of Raman analysis is widened.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced Raman scattering spectroscopy (SERS) detection, in particular to a graphene / Au composite material. Background technique [0002] The surface-enhanced Raman scattering spectroscopy detection technology is based on the Raman effect and is a technology developed based on the near-field enhancement characteristics of surface plasmon resonance (SPR). SERS is a commonly used analytical technique, which has the advantages of high sensitivity, strong selectivity, and good repeat stability. It has a wide range of applications in the fields of environmental science, biological science, and trace analysis. [0003] In the specific SERS detection, the resonance frequency of the surface plasmon varies with the type, size, and shape of the metal nanoparticles. Therefore, the surface-enhanced Raman signal can be obtained by controlling these factors. Among them, the roughness of the substrate surface o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/16C23C14/06C23C14/34C23C14/02
CPCC23C14/024C23C14/0605C23C14/165C23C14/3478C23C14/35
Inventor 徐洪秀
Owner 青岛粲耀新材料科技有限责任公司
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