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Raman reinforced substrate material, preparation and application methods thereof

A technology of substrate materials and application methods, applied in the directions of Raman scattering, material excitation analysis, nanotechnology, etc., can solve the problems of expensive, complicated pretreatment, time-consuming, etc., and achieve short detection time, rapid detection, and simple sample processing Effect

Inactive Publication Date: 2012-10-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are time-consuming, expensive, and complicated in sample pretreatment, which is not conducive to the rapid and simple detection of benzo(a)pyrene

Method used

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  • Raman reinforced substrate material, preparation and application methods thereof
  • Raman reinforced substrate material, preparation and application methods thereof
  • Raman reinforced substrate material, preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of Raman-enhanced substrate materials:

[0022] 1) Use acetone to ultrasonically remove the dirt on the surface of the titanium sheet, and then wash it with ethanol; use HF solution (concentration of 0.01mol / L~0.5mol / L) to wash off the oxides and impurities on the surface, and after drying, immerse the clean titanium sheet in In the electrolyte of 0.5mol / LNaF, the platinum sheet is used as the cathode, and the titanium sheet is used as the anode, and the anodic oxidation treatment is carried out at 10V-15V under DC power supply for 1h-3h, and the pore diameter is 90nm-100nm, the length is 300nm-350nm, and the effective electrode is prepared. TiO with an area of ​​length 4cm×width 1cm-2cm 2 Nanotube array, washed and dried for later use;

[0023] 2) Sonicate graphite oxide powder in 0.1M pH 9.0 PBS buffer for 30min; form a uniform brown graphite oxide electrolyte with a concentration of 0.1mg / mL-0.5mg / mL; then reduce it by cyclic voltammetry, using three ele...

Embodiment 2

[0027] Raman-enhanced substrate of the present invention is used for R6G (rhodamine 6G) analysis

[0028] The Raman-enhanced composite material was cut into a square with a size of 5 mm × 5 mm as the substrate for Raman detection. A standard solution of 1mM R6G was prepared, and a series of concentrations were prepared by layer-by-layer dilution. Use a pipette gun to draw 20 μL of the solution of the corresponding concentration and drop it on the Raman substrate prepared above. After it is naturally absorbed and dried, use a Voyage confocal Raman microscope for Raman detection (such as Figure 3-4 ), the Raman excitation wavelength is 785nm. This material can be used as a substrate to measure the Raman characteristic peak of the R6G solution with the lowest concentration of 0.1nM, so the material can be used as an effective surface Raman enhanced substrate.

Embodiment 3

[0030] Benzo(a)pyrene sample analysis and detection

[0031] Take 10L Xiangjiang water, use solid phase extraction method to extract and enrich benzo(a)pyrene in Xiangjiang water; choose 5mL / min as the sample loading volume flow rate to ensure high analyte recovery and save sample processing time; sample solution After passing through the extraction column, nitrogen gas was passed through for 10 minutes to dry the sample. Use dichloromethane as the eluent of the solid-phase extraction column to elute the enriched material, and then use nitrogen to remove the eluent and dry the sample. Use acetone to dissolve it, add the benzopyrene sample solution dropwise on the base material at normal temperature and pressure, and use the Voyage confocal Raman microscope for Raman detection after natural drying ( Figure 5 ). The test results were compared with the Raman characteristic peaks of pure benzo(a)pyrene directly detected by Raman spectrometer, and it was found that at 332cm -1 ...

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PUM

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Abstract

The invention discloses a raman reinforced substrate material, preparation and application methods thereof. A preparation method comprises the following steps: firstly, preparing a TiO2 nanometer tube array; depositing graphene on the TiO2 nanometer tube array; and lastly, dropwise adding nanometer silver sol to the surface of a substrate, thereby forming a compound material after the nanometer silver sol is dried. The convenient and quick detection for various harmful substances in an environmental sample, especially for benzo (a) pyrene, can be realized by using a raman reinforced substrate. A new method for detecting the benzo (a) pyrene is provided according to an application method of the raman reinforced substrate material. Compared with a traditional method, a surface reinforced raman detection method using the raman reinforced substrate material has the advantages of short detection time and simple sample treatment.

Description

Technical field: [0001] The invention relates to a Raman enhanced base material and its preparation and application method. Background technique: [0002] Polycyclic aromatic hydrocarbons refer to hydrocarbons containing two or more benzene rings, also known as fused-ring aromatic hydrocarbons. More than 200 types of polycyclic aromatic hydrocarbons have been discovered so far. Polycyclic aromatic hydrocarbons can exist in the environment for a long time without being degraded. They are highly toxic, bioaccumulative, and hydrophobic, and are important persistent organic pollutants. Studies have confirmed that many types of polycyclic aromatic hydrocarbons have strong carcinogenicity, among which benzo(a)pyrene with five benzene rings has the widest distribution and source, the strongest toxicity and is the most representative. Benzo(a)pyrene is distributed in industrial wastewater, waste gas, automobile exhaust, waste residue and waste gas emitted from fossil fuel combustio...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y40/00
Inventor 罗胜联林婵陈章陈瑶滕雅蓉刘承斌唐艳红
Owner HUNAN UNIV
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