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A surface-enhanced Raman scattering substrate and its preparation method and application

A surface-enhanced Raman, substrate technology, applied in Raman scattering, textiles and papermaking, non-woven fabrics, etc., can solve problems such as limited application, achieve the effect of improving detection limit, wide application and suitable for large-scale mass production

Active Publication Date: 2018-05-01
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface-enhanced Raman active substrate is selective for the analyte, and different analytes require different substrates, which limits its application.

Method used

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  • A surface-enhanced Raman scattering substrate and its preparation method and application
  • A surface-enhanced Raman scattering substrate and its preparation method and application
  • A surface-enhanced Raman scattering substrate and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0064] A method for preparing a surface-enhanced Raman scattering substrate, comprising the following steps:

[0065] (1) Preparation of polylactic acid electrospun film: Weigh 0.5 g of L-type polylactic acid and dissolve it in a mixed solution of 5 ml of dichloromethane and N,N-dimethylformamide (4:1 by volume) , and magnetically stirred at room temperature for 12 hours to obtain a uniform spinning solution, wherein the concentration of L-type polylactic acid was 0.1 g / mL.

[0066] Then, transfer the spinning solution into a 5 mL medical syringe and fix it on a small syringe pump, and connect the pump head tube with a 6-gauge stainless steel needle. The needle is connected to the high-voltage positive electrode with an alligator clip. Below the needle is a grounded roller collector covered with a layer of aluminum foil as a collection device. The distance between the needle and the aluminum foil is 15 cm. The humidity in the spinning machine is controlled by a dehumidifier, ...

Embodiment 2

[0072] A method for preparing a surface-enhanced Raman scattering substrate, comprising the following steps:

[0073] (1) Preparation of polylactic acid electrospun film: Weigh 1 g of L-type polylactic acid and dissolve it in a mixed solution of 5 ml of dichloromethane and N,N-dimethylformamide (6:1 by volume) , and magnetically stirred at room temperature for 12 hours to obtain a uniform spinning solution, wherein the concentration of L-type polylactic acid was 0.2 g / mL.

[0074] Then, transfer the spinning solution into a 5 mL medical syringe and fix it on a small syringe pump, and connect the pump head tube with a 6-gauge stainless steel needle. The needle is connected to the high-voltage positive electrode with an alligator clip. Below the needle is a grounded roller collector covered with a layer of aluminum foil as a collection device. The distance between the needle and the aluminum foil is 15 cm. The humidity in the spinning machine is controlled by a dehumidifier, an...

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Abstract

The invention provides a surface-enhanced Raman scattering substrate, which comprises a polylactic acid electrospinning film and metal nanoparticles distributed on the surface and inside of the polylactic acid electrospinning film, and the metal nanoparticles are positively charged. The surface-enhanced Raman scattering substrate has the advantages of high enhancement capability, good repeatability, long-term storage, and enrichment of analytes. The present invention also provides a method for preparing a surface-enhanced Raman scattering substrate, comprising: (1) dissolving polylactic acid in an organic solvent to obtain a spinning solution, and electrospinning the spinning solution to obtain a polylactic acid electrostatic Spinning film; (2) setting metal nanoparticles on the surface and inside of the polylactic acid electrospinning film by spotting to obtain the surface-enhanced Raman scattering substrate. The preparation method of the surface-enhanced Raman scattering substrate is simple and suitable for large-scale batch production, and the prepared surface-enhanced Raman scattering substrate can be used in various fields such as food analysis and environmental analysis.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a preparation method and application of a surface-enhanced Raman scattering substrate. Background technique [0002] The surface-enhanced Raman scattering (Surface-enhanced Raman Scattering, SERS) phenomenon can be summarized as a phenomenon in which the intrinsic Raman signal of molecules adsorbed on rough noble metal surfaces is greatly enhanced, and the enhancement factor can reach 14-15 orders of magnitude at most. When SERS is used as a detection method, its detection level can reach the single molecule level, which is a cutting-edge material analysis technology. The enhancement contribution of SERS mainly comes from the enhancement of the local electromagnetic field generated by the surface plasmon oscillation of the noble metal SERS active substrate and the incident light and the scattered light scattered by molecules during the Raman test. Therefore, the per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65D04H1/4326D04H1/728D06M11/83D06M101/32
Inventor 喻学锋郭志男邵俊东唐思莹
Owner SHENZHEN INST OF ADVANCED TECH