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Selective detection method for TNT (trinitrotoluene) by enhanced Raman spectrometry of functionalized shell isolated nanoparticles

A nanoparticle and Raman spectroscopy technology is applied in the field of selective detection of TNT by enhanced Raman spectroscopy, which can solve the problems affecting the accuracy of SERS spectra, charge transfer, and easy damage to the shell, and achieve a good SERS enhancement effect. Effect

Inactive Publication Date: 2014-09-10
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is also an electrical contact, that is, metal nanoparticles are in contact with some metal substrates, because there will be a difference in the Fermi level between the two, and this difference will lead to charge transfer and contact potential, so that it will affect the The electronic structure of the probe molecule further affects the accuracy of the SERS spectrum
[0004] In addition, the preparation method of ordinary SHINERS particles is relatively complicated, and there are many experimental parameters that need to be adjusted, which is time-consuming and labor-intensive. At the same time, the prepared nanoparticles have poor acid and alkali resistance, that is, the shell can Layers are easily destroyed and the resulting nanoparticle shells do not have functional properties

Method used

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  • Selective detection method for TNT (trinitrotoluene) by enhanced Raman spectrometry of functionalized shell isolated nanoparticles
  • Selective detection method for TNT (trinitrotoluene) by enhanced Raman spectrometry of functionalized shell isolated nanoparticles
  • Selective detection method for TNT (trinitrotoluene) by enhanced Raman spectrometry of functionalized shell isolated nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0041] TEM characterization of functionalized shell-insulated nanoparticles with different shell thicknesses:

[0042] Au PAT with different shell thicknesses was obtained by controlling the concentration of o-mercaptoaniline and surfactant sodium dodecyl sulfate. The obtained solution was repeatedly washed until the supernatant in the centrifuge tube was colorless, and then the obtained centrifuged bottom liquid was dropped onto a copper grid for testing. The shell thickness of the obtained Au PAT particles was about 2 , 4, 10 and 30 nanometers, the size of gold nanoparticles is about 50 nanometers, such as figure 2shown. At the same time, it should be noted that before and after the modification of gold nanoparticles, the solution changed from wine red to violet.

Embodiment 2

[0044] TEM characterization of gold nanoparticles with different shapes and particle sizes (20nm to 50nm) as the core functionalized shell-isolated nanoparticles:

[0045] Centrifuge the prepared gold sol, and then mix gold nanoparticles with different particle sizes (the particle size ranges from 20 nm to 50 nm), or use gold nanorods instead of gold nanospheres as the core, and add o-mercaptoaniline After the Au PAT nanoparticle solution obtained after the reaction was centrifuged and cleaned, and then dropped on the copper grid obtained TEM figure, the results are as follows image 3 shown.

Embodiment 3

[0047] SERS characterization of nanoparticles with gold nanoparticles as the core and 2 nm poly-o-mercaptoaniline as the shell (Au2 nm PAT) under different pH conditions:

[0048] The obtained Au2 nm PAT was placed in solutions with different pH values, and then used as a SERS substrate, and then added with 10 -3 mol / L TNT solution for Raman testing. Observe the acid and alkali resistance of this particle from the change of SERS spectrum, such as Figure 4 shown. When the pH of the solution is 6.86, the measured TNT signal is the best. When the pH is 2.02 and 12.95, the measured TNT signal is relatively poor. When it is less than 2.02 or greater than 12.95, the TNT signal cannot be detected. It can be judged that the nanoparticles have been completely destroyed and can no longer be used, so that the applicable pH range of the SERS substrate is 2.02-12.95.

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Abstract

The invention provides a selective detection method for TNT by enhanced Raman spectrum of functionalized shell-isolated nanoparticles. The detection method includes the following steps: (1) One-step synthesis of functionalized nanoparticles with gold nanoparticles as the core and poly-o-mercaptoaniline as the shell by the solution method to form a base solution; (2) mixing the above base solution with the substance TNT to be tested The solution is fully mixed, and the TNT is selectively enriched by using the specific combination of the amino functional group on the functionalized nanoparticle shell and the TNT; (3) The fully mixed solution in step (2) is dropped onto the silicon wafer; (4) Detect and analyze the substance to be tested on the above-mentioned silicon wafer under a Raman spectrometer. The substrate used in the detection method of the present invention is simple to prepare, low in cost, strong in universality, and has functional characteristics, so that the selective detection of low-concentration TNT can be realized.

Description

technical field [0001] The invention relates to a detection method of laser Raman spectrum, in particular to a selective detection method of TNT by enhanced Raman spectrum. Background technique [0002] Since the discovery of Surface Enhanced Raman spectroscopy (SERS) in 1974, the realization of SERS substrates in trace and ultra-trace analysis and detection has been the goal of people's hard research, and various theories and experiments SERS has also been demonstrated to be a vibrational spectroscopy technique with extremely high surface detection sensitivity. However, for SERS applications, there is still a defect that cannot be ignored, that is, the universality of SERS substrate materials and surface morphology. The problem of substrate universality is inherent in the SERS phenomenon. First of all, the SERS substrate is required to be nanoscale rough, and the substrate material requires the metal to have free electrons, so that it can have a plasma model and thus have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 杨良保钱凯刘洪林刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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