Method for detecting residual organics on fire scene based on surface enhancing raman spectrum

A surface-enhanced Raman and spectral detection technology, which is applied in Raman scattering, measuring devices, and material analysis through optical means, can solve problems such as interference, and achieve the effects of improved detection ability, convenient preparation, and no background interference

Active Publication Date: 2016-03-23
SHANGHAI FIRE RES INST OF THE MIN OF PUBLIC SECURITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the functional group is directly combined on the surface of the SERS substrate, it will also generate spectral signals, and these background signals will interfere with the accurate analysis and determination of the spectrum of the analyte.

Method used

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  • Method for detecting residual organics on fire scene based on surface enhancing raman spectrum
  • Method for detecting residual organics on fire scene based on surface enhancing raman spectrum
  • Method for detecting residual organics on fire scene based on surface enhancing raman spectrum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034](1) Preparation of metal film and its detection device: cut the glass slide into small pieces of 1.5×1.5cm, and vacuum-plate a gold film of about 200nm on the small glass piece by JEOL JFC-1600 fine plating apparatus; (Glass plate coated with gold film) soaked in 1mM methanol solution of hexanethiol, so that the surface of the gold film self-assembled with a hydrophobic carbon chain layer, see figure 2 (A); For ease of operation, self-assembled gold sheets with carbon chains are assembled on glass slides to make portable detection devices, see figure 2 Embedded figure in (A).

[0035] (2) Preparation of colloids containing gold nanoparticles: using chloroauric acid and sodium citrate as raw materials, chemical wet synthesis of colloids containing 60nm gold nanoparticles, as shown in Figure 2(B).

[0036] (3) Samples: benzofluoranthene, fluoranthene, benzanthracene and pyrene are the target compounds for the identification of gasoline combustion accelerant fire evidenc...

Embodiment ２

[0043] (1): According to the method of Example 1, a metal film, a detection device thereof, and a colloid containing gold nanoparticles were prepared;

[0044] (2): Sample: The four compounds of benzofluoranthene, fluoranthene, benzanthracene and pyrene are used as the analytes, and the methanol that has been soaked in the soil and filtered with filter paper is used as the solvent to prepare methanol as a mixture of the four compounds. Solution, the concentration of each compound is 5 μM;

[0045] (3): Use a dropper to take 0.1 mL of the methanol solution containing the four compounds described in step (2);

[0046] (4): Add the sample solution dropwise on the gold piece obtained in step (1) placed horizontally;

[0047] (5): After the solvent evaporates naturally, add 5 μL of the colloid containing gold nanoparticles described in step (2) dropwise, and the area covered by the gold film is about 2-3mm 2 ;

[0048] (6): Add the compound-free methanol soil extract and the col...

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Abstract

The invention relates to a method for detecting residual organics on a fire scene based on a surface enhancing raman spectrum. The method comprises the following steps: constructing a detection substrate material which comprises a metal film and a nanometer particle, wherein the surface of the metal film is modified with functional groups, the metal film has a hydrophobic effect and is smooth and flat, and the nanometer particle has surface enhancing raman activity and is free from modification with the functional groups; dropwise adding the filtration liquid onto the surface of the metal film with the hydrophobic effect; after finishing the dropwise adding, naturally volatilizing the liquid; dropwise adding the colloid containing the nanometer particle with the surface enhancing activity on the surface of the metal film and utilizing a raman spectrometer to detect the colloid on the surface of the metal film; comparing and analyzing the acquired spectrum chart and identifying the category of the organic compound in the to-be-detected article. According to the method, the operation is simple and convenient; the detecting base structure is simple and can be directly used for extracting, absorbing and enriching the analyte in the solution sample; the designed and constructed enhancing system can realizably acquire high-quality SERS test result; the method has the advantages of high sensitivity, excellent repeatability, zero background interference, and the like.

Description

technical field [0001] The invention belongs to the technical field of Raman spectrum detection, in particular to a method for rapidly detecting residual organic matter at a fire scene based on surface-enhanced Raman spectrum. Background technique [0002] The fire evidence is the objective reality related to the fire, which can reveal and prove the cause of the fire. Organic compounds are ubiquitous in people's production and life. Quickly and accurately grasping the types of compounds and their molecular structures and physical and chemical properties of residual organic evidence in the fire scene is of great significance for the identification of the cause of fire accidents, on-site decision-making and post-disaster disposal. How to develop and establish scientific and effective organic evidence detection and analysis technology to provide timely and reliable technical support for public security and fire protection departments is one of the key points that researchers in...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 顾海昕张永丰薛林龙亿涛曹丽英
Owner SHANGHAI FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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