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Method for preparing hydrophobic SERS substrate by using silk-screen printing technology

A screen printing, hydrophobic technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of lack of serial comparability, complicated preparation methods, uncontrollable roughness, etc., to achieve rapid testing, low price, and high sensitivity Effect

Active Publication Date: 2015-11-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the morphology of SERS substrates obtained by people is various, and good SERS signals can also be obtained through specially treated samples or substrate surfaces, but the roughness is uncontrollable or not comparable in series, the preparation method is complicated, and the price is expensive. question

Method used

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  • Method for preparing hydrophobic SERS substrate by using silk-screen printing technology
  • Method for preparing hydrophobic SERS substrate by using silk-screen printing technology
  • Method for preparing hydrophobic SERS substrate by using silk-screen printing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix 0.12g of siloxane-modified epoxy resin, 0.87g of nano-silver particles and 5mL of diethylene glycol ether acetate, and then add 0.01g of 5-decyne-4,7-diol-479- Tetramethyl (DDTM) dispersant, magnetically stirred until uniformly mixed to obtain a slurry.

[0035] The paste configured above was screen printed with 420 mesh polyester. Place the pretreated ITO film on a flat substrate, place the screen flat on the ITO film, and drop an appropriate amount of slurry on the surface of the screen. The amount of slurry can be quickly scraped from the surface of the screen with a soft scraper. After that, a thin film was obtained.

[0036] Place it horizontally at room temperature for 10 minutes, then bake and solidify at 150°C for 30 minutes. The surface was cleaned with methyl ketone to obtain a hydrophobic SERS substrate, the SEM of which is shown in image 3 , the nano-silver particles are uniformly distributed and densely arranged, and the contact angle of water dropl...

Embodiment 2

[0038] Mix 0.12g of siloxane-modified epoxy resin, 0.87g of nano-gold particles and 5mL of diethylene glycol ether acetate evenly, then add 0.01g of DDTM dispersant, stir magnetically until uniformly mixed, and use it as a slurry. The paste configured above was screen printed with 420 mesh polyester. Place the pretreated ITO film on a flat substrate, place the screen flat on the ITO film, and drop an appropriate amount of slurry on the surface of the screen. The amount of slurry can be quickly scraped from the surface of the screen with a soft scraper. After that, a thin film was obtained. Place horizontally at room temperature for 10 minutes, then bake at 150°C for 30 minutes. Clean the surface with methyl ketone to obtain a film layer that is the hydrophobic SERS substrate.

Embodiment 3

[0040]Mix 0.12g of siloxane-modified epoxy resin, 0.87g of Au / Ag core-shell structure nano-metal particles and 5mL of diethylene glycol ethyl ether acetate, then add 0.01g of DDTM dispersant, magnetically stir until mixed Uniformly, as a slurry. The paste configured above was screen printed with 420 mesh polyester. Place the pre-shrunk ITO film (preheated at 150°C for 60 minutes) on a flat substrate, place the screen flat on the ITO film, and drop an appropriate amount of slurry on the surface of the screen. The quality scraper quickly scrapes across the surface of the screen to obtain a thin film. Place horizontally at room temperature for 10 minutes, then bake at 150°C for 30 minutes. Clean the surface with methyl ketone to obtain a film layer that is the hydrophobic SERS substrate.

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Abstract

The present invention discloses a method for preparing a hydrophobic SERS substrate by using a silk-screen printing technology, and belongs to the technical field of SERS substrate preparation. The method comprises: dispersing noble metal nanoparticles in a polymer solution, adding an auxiliary agent, carrying out low temperature ultrasonic dispersion to obtain a uniformly-mixed slurry, placing a pre-treated ITO film or PMMA film onto a flat plate substrate, flatly placing a polyester silk screen onto the ITO film or PMMA film, adding the slurry on the surface of the silk screen in a dropwise manner to print, curing, and cleaning to obtain the hydrophobic SERS substrate. According to the present invention, the reactive thermal curing or ultraviolet curing resin is added so as to make the substrate have the hydrophobicity, such that the sensitivity on the surface-enhanced Raman effect is high; and the detection limit of the prepared SERS substrate on the dye rhodamine 6G can achieve 10<-14> M, and the SERS substrate provides the good Raman enhancement effect on 4-MBA.

Description

technical field [0001] The invention relates to the technical field of SERS substrate preparation, and relates to a method for preparing a hydrophobic large-area SERS substrate by using screen printing technology. Background technique [0002] Surface-enhanced Raman scattering (SERS) is a micro-analysis technique with extremely high sensitivity. It is characterized in that the sample does not need special preparation when detecting the molecular structure, and it does not need to be in direct contact with the sample. It is non-polluting and non-destructive. Compared with In terms of infrared spectroscopy, Raman spectroscopy avoids the influence of moisture on detection. The key to obtaining high-quality SERS signals is the surface-enhanced substrate. Surface-enhanced substrates are often nanostructured. The particle size, shape, and arrangement of surface-enhanced substrates are closely related to SERS activity. [0003] At present, the morphology of SERS substrates obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 殷鹏刚史吉华梁本亮梁秀
Owner BEIHANG UNIV
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