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Galvanic/graphene/gold film three-dimensional sERS substrate and preparation method

A graphene and substrate technology, which is applied in the field of preparation of three-dimensional SERS substrate based on silver gyrus/graphene/gold film composite, can solve the influence of enhanced strength, sensitivity and uniformity of metal nanostructure shape, size and periodicity, etc. problems, to achieve the effects of easy promotion, high detection efficiency, and enhanced enhancement strength

Active Publication Date: 2021-05-11
SHANDONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Galvanic/graphene/gold film three-dimensional sERS substrate and preparation method
  • Galvanic/graphene/gold film three-dimensional sERS substrate and preparation method
  • Galvanic/graphene/gold film three-dimensional sERS substrate and preparation method

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preparation example Construction

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

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

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

[0046] Further, the silver gyrus nanostructure has a width of 10-30 nm, a gap of 1-10 nm, and a thick...

Embodiment 1

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

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

[0050]2) Physical vapor deposition (PVD) thermally evaporated gold film: put the clean quartz sheet into the thermal evaporation 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 it, and pump it 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 into the prepared FeCl 3 In the solution (1M), make the copper foi...

Embodiment 2

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

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

[0059] 2) Physical vapor deposition (PVD) thermally evaporated gold film: put the clean mica sheet into the thermal evaporation 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 it, and pump it 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, let it dry naturally, put it into the prepared FeCl 3 In the solution (1M), make the copper foil float on the surface...

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Abstract

The invention provides a preparation method and application of a silver gyrus / graphene / gold film composite three-dimensional Raman enhanced substrate, comprising the following steps: depositing a gold nano-film on the surface of the quartz substrate by thermal evaporation, and wet transfer chemical vapor phase Graphene grown by deposition method (CVD), and then use thermal evaporation method to vapor-deposit silver gyrus nanostructures on the surface of graphene to obtain silver gyrus / graphene / gold film composite three-dimensional Raman enhanced substrate. Repeating the above steps can prepare a silver gyrus / graphene / gold film three-dimensional composite structure on a flexible ultra-thin mica sheet to obtain a flexible Raman-enhanced substrate for food safety detection.

Description

technical field [0001] The invention belongs to the field of three-dimensional Raman enhanced (SERS) substrates, in particular to a preparation method and application of a composite three-dimensional SERS substrate based on silver gyrus / graphene / gold film. Background technique [0002] Raman enhancement, a physical phenomenon, has attracted the attention of researchers in recent years because it can provide ultrasensitive and label-free chemical and biological analysis. Much effort has been made by researchers to improve the enhancement 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 the number of hot spots can be increased, and it is very conducive to the ad...

Claims

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Application Information

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Patent Type & Authority Patents(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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