A magnetic surface-enhanced Raman spectroscopy substrate and a preparing method thereof

A surface-enhanced Raman and substrate technology, which is applied in the field of analysis and detection, can solve problems such as cumbersome operation, waste of energy, and impact on detection results, and achieve the effects of good dispersion, simple method, and low cost

Inactive Publication Date: 2014-09-10
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the substrate prepared with gold or silver nanoparticles needs surfactant to achieve the dispersion effect in the prior art, resulting in cumbersome ope

Method used

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  • A magnetic surface-enhanced Raman spectroscopy substrate and a preparing method thereof
  • A magnetic surface-enhanced Raman spectroscopy substrate and a preparing method thereof
  • A magnetic surface-enhanced Raman spectroscopy substrate and a preparing method thereof

Examples

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Embodiment 1

[0022] A magnetic surface-enhanced Raman spectroscopy substrate, the substrate is made of Fe 3 o 4 Core-shell structure Fe as the core and Ag as the shell 3 o 4 / Ag particles are piled up. The preparation method of the surface-enhanced Raman spectrum substrate with magnetic properties is as follows: Fe 3 o 4 Disperse the microspheres in water and ultrasonically disperse for 10-20 minutes to make a dispersion liquid; add ascorbic acid to the dispersion liquid, and the concentration of ascorbic acid in the dispersion liquid is 0.04-1.1g / L; then add AgNO to the dispersion liquid 3 , AgNO 3 The concentration in the dispersion liquid is 0.017-0.34g / L, react at 0-65°C for 20-120min, collect the product with a magnet after the reaction, wash with water and ethanol to obtain Fe 3 o 4 Surface-enhanced Raman spectroscopy substrate formed by stacking Ag particles.

Embodiment 2

[0024] Dissolve 0.54g of ferric chloride hexahydrate, 1.176g of sodium citrate dihydrate, and 0.36g of urea in 40ml of distilled water, then add 0.3g of polyacrylamide and stir until completely dissolved; Put it in a 50mL reaction kettle of tetrafluoroethylene, seal it and place it in a blast drying oven, and react at 200°C for 7 to 10 hours; after the reaction is completed, cool it down to room temperature naturally, collect the black precipitate with a magnet, wash it with distilled water for 3 times, and then Washed three times with absolute ethanol, dried in a vacuum oven at 60° C. for 8 hours to obtain a black powder. Then take a small amount of black powder, add distilled water and ultrasonically disperse it, drop the dispersion onto a silicon wafer, and test it after natural drying to obtain the following: figure 1 The SEM picture shown in a shows that the obtained black powder is Fe with a diameter of about 200 nm 3 o 4 spherical particles. Fe 3 o 4 The dispersion...

Embodiment 3

[0028] The preparation method of the SERS substrate is the same as in Example 2, but the amount of the dispersion liquid added to 160 mL of distilled water is changed to 200 μL, and other conditions are the same as in Example 2. Such as Figure 4 As shown in a, when the amount of dispersion A added is 200 μL, Fe 3 o 4 / Ag particles are dispersed.

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Abstract

A magnetic surface-enhanced Raman spectroscopy substrate is disclosed. The substrate is formed by stacking Fe3O4/Ag particles having a shell-core structure that adopts Fe3O4 as a core and Ag as a shell. The preparing method includes: dispersing Fe3O4 microspheres into water, performing ultrasonic dispersion to obtain a dispersion liquid, adding ascorbic acid into the dispersion liquid, adding AgNO3 into the dispersion liquid, and reacting at 0-65 DEG c for 20-120 min to obtain the surface-enhanced Raman spectroscopy substrate formed by stacking the Fe3O4/Ag particles. SERS enhancing effects of the Ag of the substrate are better by usually 1-2 order of magnitudes than that of gold. The method allows convenient collection with magnets, thus avoiding centrifugation, filtration, and other tedious and time-consuming manners.

Description

technical field [0001] The invention relates to an analysis and detection method, in particular to a surface-enhanced Raman spectrum detection method. Background technique [0002] In 1928, the Indian scientist C.V. Raman experiment discovered that when light passes through a transparent medium and is scattered by molecules, the frequency changes. This phenomenon is called Raman scattering. Raman spectroscopy, like infrared spectroscopy, can reflect the information of molecular vibration-rotational energy levels, but the signal of Raman scattering is very weak, and its intensity is only one millionth of the incident light intensity. Not widely appreciated by the scientific community. Until 1974, Fleishmann et al. found that after roughening the surface of a smooth silver electrode, the high-quality Raman spectrum of a monolayer of pyridine molecules adsorbed on the surface of a silver electrode was obtained for the first time, and its intensity was comparable to that of pyr...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 叶英杰郭怡杨柳黄汉京
Owner HENAN INST OF ENG
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