Preparation method of nano-silver SERS probe for TNT detection

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

Active Publication Date: 2019-05-10
HEFEI UNIV
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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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  • Preparation method of nano-silver SERS probe for TNT detection
  • Preparation method of nano-silver SERS probe for TNT detection
  • 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

[0053]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:

[0054] 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 amoun...

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Abstract

The invention discloses a preparation method of a nano-silver SERS probe for TNT detection. The preparation method comprises the following steps of preparing a silver nanorod, and forming a single-layer self-assembly space structure and a double-layer self-assembly space structure of the silver nanorod on a glass slide in sequence. The preparation process comprises the following two steps of firstly, preparing the silver nanorod, immersing the glass slide into an ethanol solution of polyvinyl pyridine and then immersing the glass into into silver sol, forming a single-layer self-assembly silver nanorod on the surface of the glass slide, immersing the single-layer self-assembly silver nanorod into a 2,4-dimercaptoaniline solution, forming a 2,4-dimercaptoaniline molecular layer on the surface of the silver nanorod through the action of an Ag-S bond, and lastly, immersing into the silver sol to prepare the nano-silver SERS probe with the double-layer spatial structure. According to the method, high-selectivity identification and high-sensitivity detection of the trace TNT are realized, and a detection limit is 10<-11> mol / L. The method is simple to prepare, low in cost, good in selectivity and high sensitivity, and the enhancement effects of nano-silver substrates with different shapes on SERS 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 Applications(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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