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Bionic SERS substrate of metal-based compound eye bowl structure as well as construction method and application

A metal-based, metal bowl technology, applied in the fields of nanomaterials and nanochemistry, can solve the problems of easy damage and poor structural stability of the metal bowl, and achieve the effects of strong anti-interference, high sensitivity and good repeatability

Active Publication Date: 2020-01-31
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structural stability of the metal bowl is poor, and it is easily damaged when transferred to a three-dimensional substrate with a large undulation. It cannot induce the metal bowl array with a solid bottom to assemble on the surface of a three-dimensional substrate with a large undulation.

Method used

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  • Bionic SERS substrate of metal-based compound eye bowl structure as well as construction method and application
  • Bionic SERS substrate of metal-based compound eye bowl structure as well as construction method and application
  • Bionic SERS substrate of metal-based compound eye bowl structure as well as construction method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Preparation of bionic compound eye SERS substrate of Ag bowl / silicon pyramid cone

[0043] This application designs a biomimetic SERS substrate with an Ag-based compound eye bowl structure, and constructs a continuous Ag nanobowl array on the surface of the three-dimensional substrate through multiple interface assembly and transfer. The specific preparation process is as follows:

[0044] (1) Preparation of polystyrene microspheres (PS)

[0045] Polystyrene (PS) microspheres were synthesized by emulsion polymerization. Put styrene into a three-necked flask, add an appropriate amount of water, place it in a water bath at 60°C, and perform mechanical stirring. After stirring for 1 hour, add an initiator, which is potassium persulfate solution, and react for 24 hours. 500nm PS microspheres. The resulting solution was washed with deionized water, centrifuged and dried for subsequent use.

[0046] (2) Assemble and prepare PS sphere template

[0047] First, add ...

Embodiment 2

[0052] Example 2: Microscopic Morphology of the Biomimetic Compound Eye SERS Substrate of Ag Bowl / Silicon Pyramid Cone

[0053] The morphology of the pellet template, Ag bowl, and SERS substrate involved in the process of embodiment 1 is as follows: figure 1 , 2 , 3 shown. figure 1 For a single-layer PS ball template, figure 2 is an Ag nanobowl on a planar silicon surface, image 3 Ag nanobowls on the surface of silicon cones. During the preparation of Ag-NBs / Si-C, when the two-dimensional PS colloidal spheres are transferred to the mixed solution of silver nitrate and sodium citrate for reaction, the reaction solution diffuses to the intersection of the high hemisphere of the PS spheres and the tangent plane. The Ag nanobowls are connected to each other to form a continuous Ag nanobowl film. It can be seen from the electron microscope that the Ag nanobowls and silicon cones are completely composited without cracks. This is because the thinner Ag nanobowl film has a certa...

Embodiment 3

[0054] Embodiment 3: Raman signal of the bionic compound eye SERS substrate of Ag bowl / silicon pyramid cone

[0055] In order to prove that the Ag-NBs / Si-C substrate in Example 1 has the advantage of improving the SERS signal, it was compared with substrates with different surface morphologies (Ag-NPs / Si-F, Ag-NPs / Si-C and Ag-NBs / Si-F) to compare the SERS signal of R6G, such as Figure 4 (a) shown. It can be clearly seen that the Raman signals of Ag-NBs / Si-C substrates with strong light-absorbing ability are close to those of Ag-NPs / Si-F, Ag-NPs / Si-C and Ag-NBs / Si-F, respectively. 2 times, 5 times and 7 times have a significant improvement on the SERS signal. The reasons are as follows: (1) Ag-NBs / Si-C has a micro-nano composite structure similar to the compound eyes of mosquitoes. According to the equivalent medium theory, it is beneficial to increase the absorption of incident laser light, so the reflectivity of Ag-NBs / Si-C is low For Ag-NPs / Si-F, Ag-NPs / Si-C and Ag-NBs / ...

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Abstract

The invention discloses a bionic SERS substrate of a metal-based compound eye bowl structure as well as a construction method and application. The bionic SERS substrate of the metal-based compound eyebowl structure is formed by orderly layering a metal bowl and a cone-shaped structure substrate, wherein the metal bowl is of a continuously and closely arranged single-layer bowl structure, the height of the metal bowl is 0.01-10 microns, the diameter of the bowl mouth is 0.01-10 microns, the cone is a micron pyramid cone, the height of the micron pyramid cone is 1-100 microns. According to thebionic SERS substrate of the metal-based compound eye bowl structure as well as the construction method and application, the metal bowl is assembled on the surface of the substrate with the micron pyramid cone structure and the relatively large fluctuation degree by using a solid-liquid interface chemical reduction method and a small ball template method, and then the 3D SERS substrate with the bionic compound eye structure is constructed; the bionic SERS substrate has more electromagnetic field enhanced "hot spots", and meanwhile, the utilization efficiency of the incident laser can be improved; and the bionic SERS substrate is applied to detection of harmful substances of water resources and food, the advantages of high sensitivity, excellent linearity, strong anti-interference, good repeatability and the like are achieved, and the great potential in the safety monitoring aspect is achieved.

Description

technical field [0001] The invention relates to a bionic SERS substrate with a metal-based compound eye bowl structure, a construction method and an application thereof, and belongs to the technical fields of nanomaterials and nanochemistry. Background technique [0002] By compounding a single nanomaterial, a composite material with a specific structure can be designed, which can not only have its intrinsic properties, but also endow it with new special functions. Regulating materials in this way breaks the performance limitations of single-component materials, and has excellent application prospects in the development of new functional materials, efficient use of energy, pollution treatment, and functional testing. And biomimetic nanostructures play an important role in the preparation of nanocomposites, such as trace sensors, flat panel displays, self-cleaning color-changing glass, solar cells, etc. These bionic micro-nano structures can effectively improve their mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/16C23C18/31G01N21/65B82Y30/00B82Y40/00B22F1/0545
CPCC23C18/31C23C18/1646C23C18/1657G01N21/658B82Y30/00B82Y40/00B22F1/0545G01N33/025C23C18/08C23C18/38C23C18/42B22F9/24B82Y20/00B82Y15/00B81B7/04B81B2203/0384B81C1/00214B81C99/0085B81B2201/02
Inventor 石刚李赢李建华靳璇王大伟王利魁杨井国桑欣欣倪才华
Owner JIANGNAN UNIV
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