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Preparation method of self-assembled flexible SERS (Surface Enhanced Raman Scattering) substrate and application of self-assembled flexible SERS substrate in pesticide residue detection

A flexible substrate and self-assembly technology, which can be used in measurement devices, material excitation analysis, instruments, etc., can solve the problems of low SERS sensitivity and impractical application, and achieve the effects of high sensitivity, excellent enhanced activity, and low price

Pending Publication Date: 2022-06-03
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of low sensitivity and practical application in the current SERS detection, the present invention provides a method for preparing a flexible SERS substrate with simple preparation, convenient operation and low price, and introduces the application of the flexible SERS substrate in the actual detection of pesticide residues in fruits and vegetables Applications

Method used

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  • Preparation method of self-assembled flexible SERS (Surface Enhanced Raman Scattering) substrate and application of self-assembled flexible SERS substrate in pesticide residue detection
  • Preparation method of self-assembled flexible SERS (Surface Enhanced Raman Scattering) substrate and application of self-assembled flexible SERS substrate in pesticide residue detection
  • Preparation method of self-assembled flexible SERS (Surface Enhanced Raman Scattering) substrate and application of self-assembled flexible SERS substrate in pesticide residue detection

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Embodiment 1

[0055] The embodiment of the present application discloses a method for preparing a self-assembled flexible SERS substrate, comprising the following steps:

[0056] Preparation of S1, Au@Ag nanorods

[0057] a. Preparation of Au seed solution: use ultrapure water to prepare 0.2 mol / L CTAB solution, 0.05 mol / L tetrachloroauric acid solution, and use ice water to prepare 10 mmol / L sodium borohydride solution.

[0058] Under the condition of water bath at 30°C, 2.5mL of 0.2mol / L CTAB (hexadecyltrimethylammonium bromide) solution was mixed with 2.5mL of 0.05mol / L tetrachloroauric acid solution, and stirred gently at 700rpm. 2min, stir evenly to form a golden yellow solution; then quickly add sodium borohydride solution, the solution changes from yellow to dark brown, at this time continue to stir vigorously for 30s at a speed of 1300rpm, then age in a 30°C oven for 2-3h, and store in a Store in a 4°C refrigerator.

[0059] b. Preparation of Au growth solution: Dissolve 0.7g CTAB...

Embodiment 2

[0069] The embodiment of the present application discloses a method for preparing a self-assembled flexible SERS substrate, comprising the following steps:

[0070] Preparation of S1, Au@Ag nanorods

[0071] a. Preparation of Au seed solution: use ultrapure water to prepare 0.1 mol / L CTAB solution, 0.05 mol / L tetrachloroauric acid solution, and use ice water to prepare 10 mmol / L sodium borohydride solution.

[0072] Under the condition of water bath at 28°C, 2.5mL of 0.1mol / L CTAB (hexadecyltrimethylammonium bromide) solution was mixed with 2.5mL of 0.05mol / L tetrachloroauric acid solution, and stirred gently at a speed of 600rpm 2min, stir evenly to form a golden yellow solution; then quickly add sodium borohydride solution, the solution changes from yellow to dark brown, at this time continue to stir vigorously for 32s at a speed of 1200rpm, then age in a 28°C oven for 2-3h, and store in a Reserve in the refrigerator at 3°C.

[0073] b. Preparation of Au growth solution: D...

Embodiment 3

[0083] The embodiment of the present application discloses a method for preparing a self-assembled flexible SERS substrate, comprising the following steps:

[0084] Preparation of S1, Au@Ag nanorods

[0085] a. Preparation of Au seed solution: use ultrapure water to prepare 0.2 mol / L CTAB solution, 0.1 mol / L tetrachloroauric acid solution, and use ice water to prepare 10 mmol / L sodium borohydride solution.

[0086] Under the condition of water bath at 32°C, 2.5mL of 0.2mol / L CTAB (hexadecyltrimethylammonium bromide) solution was mixed with 2.5mL of 0.1mol / L tetrachloroauric acid solution, and stirred gently at a speed of 500rpm 2min, stir evenly to form a golden yellow solution; then quickly add sodium borohydride solution, the solution changes from yellow to dark brown, at this time continue to stir vigorously at 1500rpm for 28s, then age in a 32°C oven for 2-3h, and store in a Reserve in the refrigerator at 5°C.

[0087] b. Preparation of Au growth solution: Dissolve 1.4g ...

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Abstract

The invention relates to the technical field of pesticide residue detection of fruits and vegetables, in particular to a preparation method of a self-assembled flexible SERS substrate and application of the self-assembled flexible SERS substrate in pesticide residue detection, the flexible SERS substrate is formed by compounding AB silica gel serving as a flexible substrate and a two-dimensional nano-film formed by self-assembling Au-coated Ag nano-rods; the preparation method comprises the following steps: firstly, preparing an Au nanorod by adopting a seed method, then wrapping an outer layer with silver nanoparticles, obtaining Au-coated Ag by adopting a liquid-liquid interface self-assembly method, then mixing glue A and glue B according to a ratio of 1: 1, curing to form a transparent silica gel-based thin film, printing and dyeing the Au-coated Ag film on the transparent silica gel-based thin film, and assembling to form the flexible SERS substrate. The flexible SERS substrate has good plasticity, excellent flexibility and negligible SERS background signals, can be attached to the surface of an actual sample for detection, has simple, convenient and operable actual application prospects, and provides a new method and technology for on-site rapid detection of fruit and vegetable pesticide residues.

Description

technical field [0001] The invention relates to the technical field of pesticide residue detection in fruits and vegetables, in particular to a preparation method of a self-assembled flexible SERS substrate and its application in pesticide residue detection. Background technique [0002] Today, pesticides are increasingly used in agriculture as chemical agents to protect crops and fruits from diseases, pests and weeds. However, studies have shown that the vast majority of applied pesticides will eventually enter the environment, agricultural products and even the food chain. Even at trace levels, it may directly pollute the agricultural environment and cause health risks. Therefore, the safety of eating imported food has become a current concern. question. Traditional pesticide residue detection methods include gas chromatography, liquid chromatography, enzyme-linked immunosorbent assay, etc. However, these traditional methods are more or less complicated in operation, long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 黄青刘超
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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