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Surface enhanced Raman scattering substrate, preparation method and applications thereof

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

Active Publication Date: 2016-07-20
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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  • Surface enhanced Raman scattering substrate, preparation method and applications thereof
  • Surface enhanced Raman scattering substrate, preparation method and applications thereof
  • Surface enhanced Raman scattering substrate, preparation method and applications thereof

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 electrostatic spin film and nano metal particles on the surface or in the inner of the polylactic acid electrostatic spin film, wherein the nano metal particles carry positive charges. The surface enhanced Raman scattering substrate has the advantages of high enhancing ability, good repeatability, long storage period, and capability of enriching articles to be detected. The invention also provides a preparation method of the surface enhanced Raman scattering substrate. The preparation method comprises the following steps: (1) dissolving polylactic acid into an organic solvent to obtain a spinning liquid, and using the spinning liquid to carry out electrostatic spinning to obtain a polylactic acid electrostatic spin film; (2) arranging nano metal particles on the surface and in the inner of the obtained polylactic acid electrostatic spin film through a spotting mode so as to obtain the surface enhanced Raman scattering substrate. The preparation method is simple and is suitable for massive production. The prepared surface enhanced Raman scattering substrate can be applied to food analysis, environment analysis, etc.

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 Applications(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
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