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Composite SERS substrate and preparation method and application thereof

A technology of substrate and bottom layer, applied in the field of composite SERS substrate and its preparation, can solve the problems of low detection resolution of chemical pesticide molecules, weak intensity of ordinary Raman signal, and difficulty in identifying molecular information, and achieves good consistency and detection limit. Low, easy-to-use effects

Active Publication Date: 2020-01-17
CHANGCHUN UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

However, due to the weak intensity of ordinary Raman signals, it is easy to be overwhelmed by other signals (such as fluorescent signals), and it is difficult to identify molecular information
[0004] At present, with the development of Raman technology, metal (such as gold, silver, copper) surfaces with micro-nano structures are usually used to enhance the intensity of Raman signals to improve detection accuracy, but this metal surface enhanced Raman scattering ( Surface-enhanced Raman scattering, abbreviated as SERS) substrates have low resolution for the detection of chemical pesticide molecules, which limits its application

Method used

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  • Composite SERS substrate and preparation method and application thereof
  • Composite SERS substrate and preparation method and application thereof
  • Composite SERS substrate and preparation method and application thereof

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preparation example Construction

[0026] The invention provides a kind of preparation method of composite SERS substrate, comprises the following steps:

[0027] The micro-nano structure is prepared on the surface layer of the two-dimensional material by using a nano-indentation instrument to obtain a composite SERS substrate;

[0028] The two-dimensional material includes a metal bottom layer and a graphene surface layer arranged in layers.

[0029] In the present invention, the thickness of the metal bottom layer is preferably 5-10 μm, more preferably 6 μm, 7 μm, 8 μm or 9 μm; the thickness of the graphene surface layer is preferably 1-3 nm, more preferably 1.5 nm, 2 nm or 2.5 nm. nm. In the present invention, the metal in the metal bottom layer preferably includes gold, silver or copper, more preferably copper. In the present invention, the two-dimensional material is preferably a commercially available product well known to those skilled in the art. In the present invention, the graphene surface layer o...

Embodiment 1

[0045] A nano-indentation instrument is used to prepare a micro-nano structure on the graphene surface layer of a two-dimensional material to obtain a composite SERS substrate; the two-dimensional material includes a copper bottom layer and a graphene surface layer; the working parameters of the nano-indentation instrument are: use a diamond triangular pyramid probe needle (the angle between the three surfaces is 120°, the arc radius is x is 5μm / s, the loading rate v of the workbench in the Y direction y is 5μm / s.

[0046] The area of ​​the lattice micro-nano structure on the surface of the composite SERS substrate is 20×20 μm 2 , its SEM image is shown in figure 2 shown by figure 2 It can be seen that when the loading rate of the table in the X and Y directions is 5 μm / s, two adjacent indentations are connected, and the depth of a single indentation is 1.2 μm.

Embodiment 2

[0048] Composite SERS substrate is prepared according to the method of Example 1, and the difference with Example 1 is that v y is 1 μm / s.

[0049] The area of ​​the lattice micro-nano structure on the surface of the composite SERS substrate is 20×20 μm 2 , its SEM image is shown in image 3 shown by image 3 It can be seen that when the loading rate of the table in the X and Y directions is less than 5 μm / s, two adjacent indentations overlap, and the depth of a single indentation is 0.4 μm.

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Abstract

The invention provides a composite SERS substrate and a preparation method and application thereof, and belongs to the technical field of micro-nano structure processing. The preparation method of thecomposite SERS substrate provided by the invention comprises the following steps: preparing a micro-nano structure on the surface layer of a two-dimensional material by adopting a nanoindenter to obtain the composite SERS substrate; the two-dimensional material comprises a metal bottom layer and a graphene surface layer which are laminated. The micro-nano structure prepared by the nanoindenter isgood in structural consistency, and the equipment is convenient and simple to operate. The composite SERS substrate prepared by the preparation method provided by the invention can be used for detecting chemical pesticide molecules; the micro-nano structure has an enhanced effect on the electric field intensity, and meanwhile, the graphene has an enhanced effect on chemical adsorption, so that the composite SERS substrate has high detection accuracy, high sensitivity and low detection limit on chemical pesticide molecules, and the preparation method is simple to operate and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of micro-nano structure processing, in particular to a composite SERS substrate and its preparation method and application. Background technique [0002] In agricultural production, in order to increase the yield of crops, a large amount of pesticides for killing insects, bacteria, and harmful animals (or weeds) will be used. The loss of these pesticides into the environment will cause serious environmental pollution, and the pesticide residues in the crops themselves are potentially harmful to the health of consumers. At present, the commonly used methods for detecting pesticide residues in food include gas chromatography, gas chromatography-mass spectrometry, and liquid chromatography. These methods have high detection accuracy, but generally have disadvantages such as complex preprocessing, long detection time, and inability to perform real-time detection on site. [0003] As a fingerprint spectrum to c...

Claims

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Application Information

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IPC IPC(8): B81C1/00G01N21/65
CPCB81C1/00349B81C1/00015G01N21/658
Inventor 张景然贾天棋石广丰李俊烨许颖赵伟宏
Owner CHANGCHUN UNIV OF SCI & TECH
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