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Method for producing low-friction super hydrophobic surface enhanced Raman substrate by using micro-nano particle coating layer

A technology of micro-nano particles and super-hydrophobic surface, applied in the field of analysis and detection, can solve the problems of complex preparation process, poor sensitivity and repeatability, and high cost

Inactive Publication Date: 2016-09-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, among these substrates, some preparation processes are still relatively complicated, the cost is high, and some sensitivity and repeatability are not good enough.

Method used

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  • Method for producing low-friction super hydrophobic surface enhanced Raman substrate by using micro-nano particle coating layer
  • Method for producing low-friction super hydrophobic surface enhanced Raman substrate by using micro-nano particle coating layer
  • Method for producing low-friction super hydrophobic surface enhanced Raman substrate by using micro-nano particle coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 6 g of commercial silica pellets with a diameter of 1 μm and 100 nm each, and disperse them in 99 g of absolute ethanol, then add 1 g of 1H,1H,2H,2H-perfluorodecylmercaptan, and stir for 2 hours. Put the stirred suspension into the paint tank of a commercial air pump airbrush, and spray it on the glass to form a uniform liquid film; after the absolute ethanol volatilizes, heat the glass to 160°C for 5 hours, and the surface is coated Multiscale micro-nanospheres of 1H, 1H, 2H, 2H-perfluorodecylthiol form uniform superhydrophobic coatings. The silver with a thickness of 40nm is slowly deposited on the coating by vacuum thermal evaporation, and the deposition rate is about 2nm / min. This substrate has good low-friction superhydrophobicity, can effectively realize the SHD effect, and finally realize the Raman detection of trace analytes.

Embodiment 2

[0037] Such as figure 2 As shown in (a), 15 μL of rhodamine 6G (R6G) solution was dropped on the surface of the substrate prepared in Example 1, almost in a spherical shape with a diameter of 3.34 mm. After the solvent evaporates to dryness, the figure 2 As shown in (b), R6G molecules are deposited in an approximately circular region with a diameter of 0.34 mm. From the droplet evaporation process, the contact angle photos at different times ( figure 2 (c)-(e)) It can be seen that due to the sufficiently low frictional force of the substrate surface on the solution, the contact area between the droplet and the substrate gradually decreases during the evaporation and shrinkage process. This phenomenon proves that this substrate has good SHD function.

Embodiment 3

[0039] Using scanning electron microscopy to characterize the microscopic morphology of substrates, such as image 3 (a) shown. Silica spheres with diameters of 1μm and 100nm are aggregated together, and their surface is covered with a mottled silver film. The silver film is not dense and continuous, but is composed of many island structures with a size of tens to hundreds of nanometers. On the one hand, these island structures increase the surface roughness of the substrate, making it maintain good Cayce state superhydrophobic properties; on the other hand, they have good surface plasmon resonance properties. Under laser irradiation, they can form many The sites of the electromagnetic field, they are the SERS hotspots. We simulated the electromagnetic field distribution on a part of Yindao through the finite time domain difference method (FDTD), such as image 3 (b) shown. The brighter areas in the figure represent higher electromagnetic field strengths. Most of these re...

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Abstract

The invention relates to a method for producing a low-friction super hydrophobic surface enhanced Raman (SERS) substrate by using a micro-nano particle coating layer, and belongs to the field of analysis and detection. The method concretely comprises the following steps: dispersing micro-nano spheres in ethanol, and carrying out hydrophobization surface modification to prepare a hydrophobic coating; coating a substrate with the coating to form a super hydrophobic coating layer; and slowly and uniformly depositing silver on the surface of the coating layer to complete substrate production. A silver film has enough chemical hydrophobicity and roughness, and has low-friction Kaixi-state super hydrophobous properties; and the surface of the coarse silver film has abundant SERS hot spots. A solute can be enriched in a zone with a small area in a condensed manner in the surface evaporation process of an analyte solution in order to realize Raman detection of a trace quantity of a substance. The low-friction super hydrophobic surface enhanced Raman substrate has the advantages of extremely high SERS sensitivity, extremely low detection limit, and good repeated and quantitative detection ability.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a method for preparing a low-friction super-hydrophobic surface-enhanced Raman substrate by using a coating of micro-nano particles. Background technique [0002] The analysis and detection of trace substances is very important in scientific research, pharmaceutical research and development, environmental and food safety monitoring and other fields. Surface-enhanced Raman scattering (SERS) spectroscopy is an effective method for trace analysis. It has ultra-high sensitivity and the ability to produce specific responses to different molecules, and has received extensive attention and in-depth development in recent years. According to the explanation of the SERS phenomenon by the electromagnetic mechanism, the substrate can generate surface plasmon resonance under laser excitation, thereby generating a high-intensity local electromagnetic field. These s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 吕男封雷肖东洋李尧曹丹凤史作森崔占臣
Owner JILIN UNIV
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