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Organic matter Raman detection method based on surface enhanced Raman spectroscopy

A surface-enhanced Raman and detection method technology, which is applied in Raman scattering, measuring devices, and material analysis through optical means, can solve problems such as low maturity, low Raman signal-to-noise ratio, and low data reproducibility. Achieve the effects of fluorescence reduction, Raman signal enhancement, and avoid composition changes

Pending Publication Date: 2021-11-12
SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low data reproducibility caused by uniform degree difference in the Raman detection process of organic matter samples and low Raman signal-to-noise ratio caused by strong fluorescence of low-maturity organic matter, and to provide a surface-enhanced Raman-based Raman Detection Method of Spectral Organic Matter

Method used

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Examples

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Embodiment 1

[0026] A method for detecting organic matter Raman based on surface-enhanced Raman spectroscopy, comprising the following steps:

[0027] a, the preparation of silver nano material solution: the silver nitrate solution of 10mL 1.0mmol / L is dripped gradually in the sodium borohydride solution of 30mL2.0mmol / L, and the solution is brownish yellow at last (see figure 1 ). During the preparation of the silver nanomaterial solution, the container containing the sodium borohydride solution was placed on crushed ice to ensure that the temperature of the solution did not exceed 5°C. At the same time, a magnetic stirrer is used to stir the solution to ensure that the silver nitrate solution is fully mixed during the addition of the sodium borohydride solution.

[0028] b. Grind the sample to 150-200 mesh, take 15mg sample and put it on the sample plate, flatten it to a circle with a thickness of about 1-2mm and a diameter of 1.5-2.5cm, drop 1 drop of silver nanomaterial solution to th...

Embodiment 2

[0034] Same as Example 1, the difference is: the mol ratio of silver nitrate and sodium borohydride is 1:4 in the step a, the molar concentration of silver nitrate solution is 1.2mmol / L, and the molar concentration of sodium borohydride solution is 1.9mmol / L.

Embodiment 3

[0036] Same as Example 1, the difference is: the mol ratio of silver nitrate and sodium borohydride is 1:7 among the step a, and the molar concentration of silver nitrate solution is 0.9mmol / L, and the molar concentration of sodium borohydride solution is 2.2mmol / L.

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Abstract

The invention discloses an organic matter Raman detection method based on surface enhanced Raman spectroscopy. The organic matter Raman detection method based on surface enhanced Raman spectroscopy comprises the following steps: a, dropwise adding a silver nitrate solution into a sodium borohydride solution cooled by an ice bath, continuously stirring in the dropwise adding process of the silver nitrate to enable the reaction to be fully carried out, and stopping dropwise adding the silver nitrate when the solution is brown yellow to obtain a silver nano-material solution; and b, placing a pretreated organic matter sample on a sample loading plate, flattening, dripping the silver nano-material solution obtained in the step a into the middle of the flattened sample, and carrying out Raman spectrum detection after the silver nano-material solution and the sample are fully mixed. According to the method, fluorescence generated in the organic matter Raman detection process is inhibited by using the surface enhanced Raman technology (SERS), and the Raman signal of the fluorescence is improved, so that a more accurate organic matter Raman signal is obtained.

Description

Technical field: [0001] The invention belongs to the technical field of oil and gas geochemistry, and in particular relates to a Raman detection method for organic matter based on surface-enhanced Raman spectroscopy. Background technique: [0002] In recent years, people tend to use Raman parameters of organic matter instead of traditional vitrinite reflectance as an index of organic matter maturity. This is because the traditional vitrinite reflectance detection is labor-intensive, and the test results have a lot to do with the experience of the operator, and due to optical problems, the test results of vitrinite reflectance of high-maturity samples are usually inaccurate. Using Raman parameters of organic matter to represent its maturity has the advantages of objectivity, rapid experimental operation, and no damage to samples. [0003] Organic matter has two main peaks in the Raman spectrum, D and G peaks, the distance between these two peaks, peak height, half-width, pea...

Claims

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Application Information

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IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/658G01N21/01G01N2021/0112
Inventor 靳永斌
Owner SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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