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Silver gyrus/graphene/gold film three-dimensional SERS (surface-enhanced Raman scattering) substrate and method for preparing same

A graphene and substrate technology, which is applied in the field of preparation of 3D SERS substrates based on gallium gyrus/graphene/gold film composite type, which can solve the effects of enhanced strength, sensitivity and uniformity on the shape, size and periodicity of metal nanostructures, etc. problem, to achieve the effect of easy promotion, increased specific surface area, and strong practicability

Active Publication Date: 2017-12-12
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its enhanced strength, sensitivity, and uniformity are highly susceptible to the shape, size, and periodicity of metal nanostructures.

Method used

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  • Silver gyrus/graphene/gold film three-dimensional SERS (surface-enhanced Raman scattering) substrate and method for preparing same
  • Silver gyrus/graphene/gold film three-dimensional SERS (surface-enhanced Raman scattering) substrate and method for preparing same
  • Silver gyrus/graphene/gold film three-dimensional SERS (surface-enhanced Raman scattering) substrate and method for preparing same

Examples

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Effect test

preparation example Construction

[0043] A preparation method and application of a silver gyrus / graphene / gold film composite three-dimensional Raman enhanced substrate, including the following steps: depositing a gold nano film on the surface of a quartz substrate by a thermal evaporation method, and a wet transfer chemical vapor deposition method ( CVD) grown graphene, and then using a thermal evaporation method to evaporate the silver gyrus nanostructure on the surface of the graphene to obtain a silver gyrus / graphene / gold film composite three-dimensional Raman enhanced substrate. Repeating the above steps can prepare a three-dimensional composite structure of silver gyrus / graphene / gold film on a flexible ultra-thin mica sheet to obtain a flexible Raman enhanced substrate for food safety inspection.

[0044] Further, the thickness of the gold nano film is 10-50 nm.

[0045] Further, the number of graphene layers is 2-10 layers.

[0046] Further, the width of the silver gyrus nanostructure is 10-30 nm, the gap is 1...

Embodiment 1

[0048] A preparation method of a silver gyrus / graphene / gold film composite three-dimensional Raman enhanced substrate includes the following preparation steps:

[0049] 1) Put the quartz substrates into acetone, alcohol and deionized water in turn and ultrasonically clean them in an ultrasonic machine for 15 minutes to obtain a clean quartz substrate;

[0050] 2) Physical vapor deposition (PVD) thermal vapor deposition gold film: put the clean quartz wafer into the thermal vapor deposition equipment, 15cm away from the molybdenum boat (length: 10cm, width: 10mm, thickness: 0.3mm), and place it in the molybdenum boat Add 0.0080g high-purity gold wire, seal, and pump to 5×10 -3 Pa, adjust the current to 130A to obtain a uniform gold film;

[0051] 3) Wet transfer graphene: first coat the protective layer PMMA (polymethyl methacrylate) solution on the copper foil with graphene, let it dry naturally, and put it on the configured FeCl 3 In the solution (1M), make the copper foil float on ...

Embodiment 2

[0057] A method for preparing a flexible silver gyrus / graphene / gold film composite three-dimensional Raman reinforced substrate includes the following preparation steps:

[0058] 1) Put the flexible mica film into acetone, alcohol and deionized water in order for ultrasonic cleaning in an ultrasonic machine for 15 minutes to obtain a clean mica substrate;

[0059] 2) Physical vapor deposition (PVD) thermal vapor deposition gold film: Put the clean mica sheet into the thermal vapor deposition equipment, 15cm away from the molybdenum boat (length: 10cm, width: 10mm, thickness: 0.3mm), and place it in the molybdenum boat Add 0.0080g high-purity gold wire, seal, and pump to 5×10 -3 Pa, adjust the current to 130A to obtain a uniform gold film;

[0060] 3) Wet transfer graphene: First, coat the protective layer PMMA solution on the copper foil with graphene, dry it naturally, and put it on the configured FeCl 3 In the solution (1M), make the copper foil float on the surface of the solution...

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Abstract

The invention provides a method for preparing a silver gyrus / graphene / gold film composite three-dimensional Raman enhanced substrate and application thereof. The method includes steps of depositing gold nanometer thin films on the surfaces of quartz bases by the aid of thermal evaporation processes; transferring graphene by the aid of wet processes; evaporating silver gyrus nanometer structures on the surfaces of the graphene by the aid of thermal evaporation processes to obtain the silver gyrus / graphene / gold film composite three-dimensional Raman enhanced substrate. The graphene grows by the aid of chemical vapor deposition (CVD) processes. Silver gyrus / graphene / gold film three-dimensional composite structures can be prepared on flexible ultrathin mica sheets so as to obtain flexible Raman enhanced substrates for food safety detection if the steps are repeatedly carried out.

Description

Technical field [0001] The invention belongs to the field of three-dimensional Raman enhancement (SERS) substrates, and particularly relates to a preparation method and application of a three-dimensional SERS substrate based on a silver gyrus / graphene / gold film composite type. Background technique [0002] Raman enhances this physical phenomenon. Because it can provide ultra-sensitive and label-free chemical and biological analysis, it has attracted the attention of researchers in recent years. Researchers have made a lot of efforts to improve the strength, sensitivity, and uniformity of Raman enhanced substrates. Studies have shown that these indicators mainly depend on the number and density of hot spots generated by the noble metal under the action of laser excitation. Compared with the two-dimensional enhanced substrate, the three-dimensional Raman enhanced substrate has a larger specific surface area, so it can increase the number of hot spots and is very conducive to the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张超李崇辉满宝元姜守振杨诚郁菁
Owner SHANDONG NORMAL UNIV
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