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Surface-enhanced Raman scattering substrate for detecting artificially synthesized pigments and preparation method and application of substrate

A technology of artificially synthesizing pigments and surface-enhanced Raman, applied in Raman scattering, measuring devices, instruments, etc., to achieve the effects of fast detection speed, low detection cost, and simple preparation process

Inactive Publication Date: 2017-09-22
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above existing technical problems, the present invention provides a surface-enhanced Raman scattering substrate for detecting artificial synthetic pigments and its preparation method and application, providing a new technical means for on-site sensitive and convenient detection of food safety issues

Method used

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  • Surface-enhanced Raman scattering substrate for detecting artificially synthesized pigments and preparation method and application of substrate
  • Surface-enhanced Raman scattering substrate for detecting artificially synthesized pigments and preparation method and application of substrate
  • Surface-enhanced Raman scattering substrate for detecting artificially synthesized pigments and preparation method and application of substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Preparation of a surface-enhanced Raman scattering substrate.

[0023] A. Clean the substrate: first clean the substrate with a mixed solution of 98% sulfuric acid and 30% hydrogen peroxide with a volume ratio of 8:2, or deionized water and hydrogen peroxide with a volume ratio of 5:1:1 at 70°C 1. Wash the substrate with ammonium hydroxide solution for 20 minutes. Then rinse with secondary deionized water, blow dry with nitrogen, and fix in a vacuum deposition chamber;

[0024] B. Preparation of titanium and silver film layers: In order to reduce the particles in the cavity, so that the metal target can be smoothly evaporated from the bottom of the cavity to the sample stage on the upper part of the cavity, the pressure is less than 1×10 -6 In Torr’s vacuum deposition chamber, by electron beam evaporation, on the clean substrate in the previous step, a titanium thin film layer with a thickness of 20nm is deposited at a speed of 0.2nm / s, so that the silver t...

Embodiment 2

[0026] Example 2: Substrate detection of artificial synthetic pigment amaranth by surface-enhanced Raman scattering.

[0027] At room temperature, take 2 μL of artificial synthetic pigment amaranth solution with different concentrations (1mg / L, 5mg / L, 10mg / L, 20mg / L, 30mg / L, 50mg / L, 80mg / L, 100mg / L) Drop onto the surface of the substrate. After being naturally air-dried, any 9 positions of each sample on the substrate were selected and detected by a Raman spectrometer. The detection condition is that the laser power of the spectrometer is 100mW, and the scanning time is 1s. Spectral detection range 350-1800cm -1 , and the detection result is the average spectrum of 9 sample points.

[0028] Such as figure 2 As shown, the minimum concentration of amaranth solution detected by this substrate is 1mg / L, which can be used as the detection limit of amaranth.

Embodiment 3

[0029] Example 3: Substrate Detection of Surface Enhanced Raman Scattering Artificial Synthetic Pigment Sunset Yellow.

[0030]Take 2μL of artificial synthetic pigment sunset yellow aqueous solution with different concentrations (1mg / L, 5mg / L, 10mg / L, 20mg / L, 30mg / L, 50mg / L, 80mg / L, 100mg / L) dropwise on the surface of the substrate . After being naturally air-dried, any 9 positions of each sample on the substrate were selected and detected by a Raman spectrometer. The detection condition is that the laser power of the spectrometer is 100mW, and the scanning time is 10s. Spectral detection range 350-1800cm -1 , and the detection result is the average spectrum of 9 sample points.

[0031] Such as image 3 As shown, the minimum concentration of sunset yellow solution detected by this substrate is 5mg / L, which can be used as the detection limit of sunset yellow.

[0032] In addition, the concentration of other artificial pigments such as tartrazine, indigo, and brilliant blue...

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Abstract

The invention discloses a surface-enhanced Raman scattering substrate for detecting artificially synthesized pigments and a preparation method and application of the substrate. The substrate comprises a substrate body, a titanium thin film layer covering the surface of the substrate body, a silver thin film layer covering the surface of the titanium thin film layer, and a silver nanorod array layer covering the surface of the silver thin film layer, wherein the included angle between each silver nanorod and the surface of a glass sheet is 86 degrees. The substrate is prepared in the steps of cleaning the substrate body, preparing the titanium thin film layer, preparing the silver thin film layer, preparing the silver nanorod array layer and the like, is used for detecting the artificially synthesized pigments, and is especially suitable for on-site rapid detection of food safety problems.

Description

technical field [0001] The invention relates to a surface-enhanced Raman scattering substrate and a preparation method thereof, as well as the application of artificially synthesized pigment detection based on the substrate, which belongs to the technical field of food safety detection. Background technique [0002] Nowadays, the excessive addition and residue of pesticides and food additives seriously threaten people's food safety. Among them: synthetic pigments are currently the most widely used food additives, and their addition is opaque, irregular, and illegal. Many manufacturers add excessive synthetic pigments to make profits in order to make food look more attractive. Existing detection methods generally have problems such as complex sample pretreatment process, high detection cost, long detection time, and large relative error. For the widely used food additives, there are problems such as inability to monitor in real time online and being easily affected by the ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 韩彩芹姚悦邹琦王稳段凌风
Owner XUZHOU NORMAL UNIVERSITY
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