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A kind of preparation method of nano silver SERS probe for tnt detection

A nano-silver and probe technology is applied in the field of preparation of nano-silver SERS probes, which can solve the problems of difficult analysis results and pollution, and achieve the effects of easy analysis results, increased inelastic scattering probability, and reliable structure.

Active Publication Date: 2021-06-15
HEFEI UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Significant spectral "contamination" can often be observed in complex sample matrices due to the often low concentration of target molecules and the matrix having the same pathway into the hot spot, leading to difficult analytical results

Method used

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  • A kind of preparation method of nano silver SERS probe for tnt detection
  • A kind of preparation method of nano silver SERS probe for tnt detection
  • A kind of preparation method of nano silver SERS probe for tnt detection

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preparation example Construction

[0050] A method for preparing a nano-silver SERS probe for TNT detection, characterized in that: the SERS probe is a double-layered silver nanorod that is self-assembled through adhesive coupling, and the adhesive molecules between the layers The electron-rich amino groups in the TNT molecules interact electrostatically with the three electron-deficient nitro groups in the TNT molecules, making the TNT molecules adhere to the surface of the double-layered silver nanorods. Using the localized surface plasmon resonance field on the metal surface, the TNT The conventional Raman signal of the molecule is enhanced to realize the detection of TNT. The preparation process of the above invention includes the following two steps:

[0051] The first step is the preparation of silver nanorods: first, the concentration of 0.04 ~ 0.06 mol L -1 silver ammonia solution, 1 ~ 3g / L dispersant solution and 0.004 ~ 0.006mol L -1 Surfactant solution, then take 5 ~ 10mL, 3 ~ 5mL and 1 ~ 3mL of the...

specific Embodiment

[0054] A method for preparing a nano-silver SERS probe for TNT detection, characterized in that: the SERS probe is a double-layered silver nanorod that is self-assembled through adhesive coupling, and the adhesive molecules between the layers The electron-rich amino groups in the TNT molecules interact electrostatically with the three electron-deficient nitro groups in the TNT molecules, making the TNT molecules adhere to the surface of the double-layered silver nanorods. Using the localized surface plasmon resonance field on the metal surface, the TNT The conventional Raman signal of the molecule is enhanced to achieve highly sensitive detection of trace amounts of TNT. The preparation process of the present invention comprises following two steps:

[0055] The first is the preparation of the solution: prepare a test tube washed with a low-concentration sodium hydroxide solution, accurately weigh 1.6987g of silver nitrate and place it in the test tube, add an appropriate amount...

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Abstract

A method for preparing a nano-silver SERS probe for TNT detection, comprising the preparation of silver nano-rods, and sequentially forming a single-layer and double-layer self-assembled spatial structure of silver nano-rods on a glass slide. The preparation process of the present invention has two steps: first, the silver nanorod is prepared, then, the glass slide is invaded into the ethanol solution of polyvinylpyridine, and then invaded into the silver sol, and a single layer of self-assembled silver is formed on the surface of the glass slide. The nanorods are then immersed in the 2,4-dimercaptoaniline solution, and the 2,4-dimercaptoaniline molecular layer is formed on the surface of the silver nanorods through the interaction of the Ag-S bond, and finally, they are immersed in the silver sol to prepare the bismuth Nano-silver SERS probe with layer space structure realizes highly selective recognition and high-sensitivity detection of trace TNT, with a detection limit of 10 ‑11 mol L ‑1 . The method is simple to prepare, low in cost, good in selectivity and high in sensitivity, and the SERS enhancement effects of different shapes of nano silver substrates are compared.

Description

technical field [0001] The invention relates to the field of material science, in particular to a method for preparing a nano-silver SERS probe used for TNT detection. Background technique [0002] As a powerful explosive, TNT is widely used in various fields. However, due to the residue after the explosion and the unrestricted space, a small amount of TNT vapor remains in the surrounding environment. TNT can enter the human body through the skin, esophagus, etc., causing chronic poisoning and threatening human health. Therefore, there is an urgent need to develop a rapid and low-cost trace detection method for TNT in the environment. [0003] At present, conventional methods for detecting explosives include gas chromatography, high performance liquid chromatography, electrochemiluminescence, ion chromatography, up-conversion method, fluorescence detection method, infrared-Fourier transform method, and solid-phase microextraction. methods, molecular imprinting techniques, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 高大明张立冬陈倩云刘辰辰陈红朱德春张宇刚
Owner HEFEI UNIV
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