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Preparation method of surface enhanced Raman spectrum substrate and surface enhanced Raman detection method

A surface-enhanced Raman and detection method technology, applied in Raman scattering, measuring devices, metal processing equipment, etc., can solve the problems of energy consumption, time-consuming, low loading rate, and uneven silver particles

Active Publication Date: 2020-12-18
YANSHAN UNIV
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  • Application Information

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Problems solved by technology

However, although SiO can be obtained 2 @Ag, preparation of SiO 2 The core of the @Ag nanocomposite structure lies in the reduction of silver amine ions on the surface of silica. The conventional method is to use a weak reducing agent to react at high temperature for a long time, but this method consumes energy and time; and if a strong reducing agent is used, The temperature and time of preparation can be significantly reduced, but the loading rate is low, because the steric hindrance of silica is large, a large amount of silver is quickly generated in the solution, and the prepared silver particles are not uniform enough
Therefore, the disadvantages of the above methods are obvious

Method used

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  • Preparation method of surface enhanced Raman spectrum substrate and surface enhanced Raman detection method
  • Preparation method of surface enhanced Raman spectrum substrate and surface enhanced Raman detection method
  • Preparation method of surface enhanced Raman spectrum substrate and surface enhanced Raman detection method

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preparation example Construction

[0030] The preparation method of surface-enhanced Raman spectrum substrate of the present invention, it comprises the following steps:

[0031] Step 1, preparing silica nanosphere particles, so that the silica nanospheres are ultrasonically dispersed in the aqueous solution;

[0032] Step 2, mixing the organic polymer tackifier with the silica emulsion, stirring at a high speed at room temperature, and coating the silica nanospheres on the surface;

[0033] Step 3, add glucose to the silica solution coated in step 2, stir, and make the glucose evenly adhere to the surface of the silica nanosphere based on the pre-coated organic polymer tackifier;

[0034] Step 4, ultrasonically oscillate the silver-ammonia solution that is now prepared to disperse evenly;

[0035] Step 5, adding the silver ammonia solution prepared in step 4 to the silica solution obtained in step 3, and stirring, thereby preparing an Ag-coated silica core-shell structure;

[0036] In step 6, the silica@Ag p...

Embodiment 1

[0057] SiO 2 Preparation of @Ag nanocomposite particles;

[0058] use Synthesized SiO with a particle size of 500nm 2 nanospheres. like figure 1 As shown in the transmission diagram, it can be seen that the prefabricated SiO 2 The particle size of the nanosphere is about 500nm, and the particle size is uniform and dispersed. Weigh 0.6 g of pre-synthesized SiO 2 The nanospheres were ultrasonically dispersed in a beaker filled with 40ml of water, 0.5g of PVP was added as an anchoring agent, and stirred at room temperature at 300rpm for 3h to coat the surface of the silica nanospheres with PVP. Then add an appropriate amount of 0.1 g of anhydrous glucose as a reducing agent into a certain amount of 0.1 g of pre-coated silicon dioxide aqueous solution with stirring, and continue stirring for 20 minutes to uniformly disperse the glucose. Then add the newly configured silver-ammonia solution (silver nitrate 0.1g, water 2ml, ammonia water 0.6ml). The reactant was stirred and...

Embodiment 2

[0060] Utilize the SiO of the present invention 2 @Ag composite nanoparticles as surface-enhanced Raman spectroscopy;

[0061] The silicon wafer substrate was pretreated with ethanol, aqueous solution ultrasound and ultraviolet ozone, and 50 μl of pre-prepared SiO2 was spin-coated on the silicon wafer. 2 @Ag ethanol solution (10mg / mL), then drop 20μl pre-configured concentration 10 on this substrate -8 mol / R6G aqueous solution, the substrate was dried in a vacuum oven at 50° C. for 5 h to evaporate the aqueous solution. like Figure 4 shown, at concentrations of R6G as low as 10 -8 mol / L, there is still a strong Raman detection peak, indicating that the SiO 2 @Ag Raman substrates have good surface Raman enhancement properties.

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Abstract

The invention provides a preparation method of a surface enhanced Raman spectrum substrate, which comprises the following steps: preparing silicon dioxide nanoparticles, and ultrasonically dispersingsilicon dioxide nanospheres in an aqueous solution; mixing an organic polymer tackifier with the silicon dioxide emulsion, stirring at a high speed at room temperature, and coating the surfaces of thesilicon dioxide nanospheres; adding glucose into the coated silicon dioxide solution and stirring, and attaching glucose evenly to the surfaces of the silicon dioxide nanospheres based on the pre-coated organic polymer tackifier; carrying out ultrasonic oscillation on the prepared silver-ammonia solution to uniformly disperse the silver-ammonia solution; adding the prepared silver-ammonia solution into the silicon dioxide solution, stirring to prepare an Ag-coated silicon dioxide core-shell structure, washing and drying Ag-coated silicon dioxide core-shell structure particles, and taking theAg-coated silicon dioxide core-shell structure particles as a surface enhanced Raman spectrum substrate. The surface enhancement effect is excellent.

Description

technical field [0001] The invention relates to the technical field of surface-enhanced Raman detection, in particular to a method for preparing a surface-enhanced Raman spectrum substrate at low temperature and short time and a detection method for surface-enhanced Raman. Background technique [0002] In 1928, C.V.Raman discovered the phenomenon of Raman scattering. In the 1960s, the laser greatly improved the excitation efficiency and became an ideal light source for Raman spectroscopy, and the research on Raman scattering entered a new era. The development of monochromator, detector, optical microscope, weak signal detection technology and computer technology in the later period has made great progress in many fields such as chemistry, physics and biology. At present, Raman spectroscopy has been widely used in materials, chemical industry, petroleum, polymer, biology, environmental protection, geology and other fields. [0003] The Raman scattering effect is very weak, ...

Claims

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Application Information

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IPC IPC(8): G01N21/65B22F1/02C23C18/44
CPCG01N21/658C23C18/44B22F1/17
Inventor 王海燕杜大学王琳娜刘珊王风彦徐朝鹏
Owner YANSHAN UNIV
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