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Substrate for detecting surface enhanced Raman scattering of sweetening agent as well as preparation method and application of substrate

A surface-enhanced Raman and sweetener technology, which is applied to the field of surface-enhanced Raman scattering substrates and their preparation, can solve the problems of complex preparation process, poor repeatability and high cost, and achieves simple preparation process, low detection cost, and high detection cost. fast effect

Inactive Publication Date: 2017-05-31
XUZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies are relatively mature nanostructure preparation methods at present, but they generally have defects such as complicated preparation process, high cost, and poor repeatability.
Moreover, there are many unpredictable SERS behaviors in the prepared SERS substrates, and only a few substrates are designed through known SERS enhancement mechanisms.

Method used

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  • Substrate for detecting surface enhanced Raman scattering of sweetening agent as well as preparation method and application of substrate
  • Substrate for detecting surface enhanced Raman scattering of sweetening agent as well as preparation method and application of substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation of a surface-enhanced Raman scattering substrate.

[0022] 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;

[0023] 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

[0025] Example 2: Substrate detection of the sweetener sodium saccharin by surface-enhanced Raman scattering.

[0026] 2-1 Extraction of the sweetener sodium saccharin: first heat the soda water containing the sweetener sodium saccharin in a water bath at 80°C for 5 minutes, or use an ultrasonic cleaner to sonicate the soda water to remove carbon dioxide, then take 1mL soda water and 1mL ethyl acetate Mix the esters, add them to a centrifuge tube, use a vortex mixer to mix them evenly, and let them stand for 1 minute to observe the stratification phenomenon. The lower layer is soda, and the upper layer is the ethyl acetate extract of sodium saccharin.

[0027] 2-2 Detection of sweetener sodium saccharin: Take 2μL of different concentrations (0.1mg / L, 0.3mg / L, 0.5mg / L, 1mg / L, 10mg / L, 20mg / L, 50mg / L, 100mg / L ) sodium saccharin extract was added dropwise on the substrate, and after natural air-drying, 9 positions on each of the above-mentioned samples were selected and detected b...

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Abstract

The invention discloses a substrate for detecting the surface enhanced Raman scattering of a sweetening agent as well as a preparation method and application of the substrate. The substrate comprises a base plate, a titanium film layer, a silver film layer and a silver nano-rod array layer, wherein the titanium film layer covers the surface of the base plate, the silver film layer covers the surface of the titanium film layer, the silver nano-rod array layer covers the surface of the silver film layer, and the included angle between a silver nano-rod and the surface of a glass piece is 86 degrees. The substrate is prepared by the steps of cleaning the base plate, preparing the titanium film layer, the silver film layer and the silver nano-rod array layer, and the like. The substrate is applied to the detection of the sweetening agent and is particularly applicable to the field rapid detection of food safety problems.

Description

technical field [0001] The invention relates to a surface-enhanced Raman scattering substrate, a preparation method thereof, and an application of sweetener detection based on the substrate, belonging 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: widely used additives such as sweeteners have problems such as inability to monitor online in real time. Existing detection methods generally have problems such as complex sample pretreatment process, high detection cost, long detection time, and large relative error. For sweeteners that are widely used in detection, there are problems such as inability to monitor in real time online and being susceptible to external environmental influences. question. [0003] At present, surface-enhanced Raman spectroscopy, as a highly sensitive detection technology, extends the surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 韩彩芹姚悦渠陆陆段训凯王稳段凌风
Owner XUZHOU NORMAL UNIVERSITY
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