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Preparation method of substrate material with surface-enhanced Raman scattering effect

A technology for surface-enhanced Raman and scattering effects, which is applied in the field of chemical analysis and can solve the problems of particle aggregation, complex process, and low efficiency of self-assembly methods.

Active Publication Date: 2018-08-07
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many preparation methods for SERS substrates. The most basic and convenient method is the preparation of sol-state metal nanoparticles, but pure colloidal solution particles are prone to irregular aggregation.
The self-assembly method is a relatively convenient method that can obtain a uniform SERS substrate in a certain area, but the self-assembly method is usually low in efficiency, high in cost, and complicated in process

Method used

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  • Preparation method of substrate material with surface-enhanced Raman scattering effect
  • Preparation method of substrate material with surface-enhanced Raman scattering effect
  • Preparation method of substrate material with surface-enhanced Raman scattering effect

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preparation example Construction

[0031] see figure 1 , a method for preparing a base material having a surface-enhanced Raman scattering effect according to an embodiment includes the following steps S110 to S130.

[0032] Step S110: preparing a dispersion of carboxylated polystyrene microspheres with negative charges on the surface.

[0033] The preparation of the dispersion liquid of the carboxylated polystyrene microspheres with negative charges on the surface comprises the following steps:

[0034] Add styrene and negatively charged functional monomers into the solvent at a mass ratio of 5.0-10.0:0.5-3.0, mix well, then raise the temperature to 60-80°C in a protective gas atmosphere, add the initiator, and React at 80° C. for 12 to 24 hours, and obtain a dispersion of carboxylated polystyrene microspheres with negative charges on the surface after cooling.

[0035] Negatively charged functional monomers are copolymerized with styrene to increase the negative charge of polymer microspheres, enhance the a...

Embodiment 1

[0061] (1) Preparation of a dispersion of carboxylated polystyrene microspheres with negative charges on the surface

[0062] Weigh 5g of styrene, 0.5g of acrylic acid, 95mL of deionized water and 0.05g of initiator potassium persulfate into a 250mL flask, fill with nitrogen to remove oxygen for 30min, heat up to 65°C, and react at a constant temperature of 65°C under 200rpm magnetic stirring At the end of 24 hours, a dispersion of negatively charged carboxylated polystyrene microspheres on the surface with a particle size of 350 nm was prepared.

[0063] (2) Preparation of carboxylated polystyrene and silver composite nanoparticles

[0064] Take 50mL of a 10mg / mL dispersion of carboxylated polystyrene microspheres with a negative charge on the surface, and add 100mL of a 10mg / mL aqueous solution of stannous chloride under stirring conditions to make stannous ions adsorb on the surface by electrostatic action Negatively charged carboxylated polystyrene microsphere surface to ...

Embodiment 2

[0068] (1) Preparation of a dispersion of carboxylated polystyrene microspheres with negative charges on the surface

[0069] Weigh 10g of styrene, 3g of acrylic acid, 90mL of deionized water and 0.5g of ammonium persulfate as an initiator, add them to a 250mL flask, fill with nitrogen to remove oxygen for 30min, heat up to 75°C, and react at a constant temperature of 75°C for 24h under 200rpm magnetic stirring At the end, a dispersion of negatively charged carboxylated polystyrene microspheres on the surface with a particle size of 1.2 μm was prepared.

[0070] (2) Preparation of carboxylated polystyrene and silver composite nanoparticles

[0071] Take 50mL of the 100mg / mL surface negatively charged carboxylated polystyrene microsphere dispersion, under stirring conditions, add 5mL of 100mg / mL stannous chloride aqueous solution, the stannous ions are adsorbed on the surface by electrostatic action Negatively charged carboxylated polystyrene microsphere surface to prepare tin...

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Abstract

The invention relates to a method for preparing a base material with a surface-enhanced Raman scattering effect, comprising preparing a dispersion of negatively charged carboxylated polystyrene microspheres on the surface; The dispersion of the microspheres is mixed with the stannous chloride solution evenly to obtain the dispersion of the tinned polystyrene microspheres; and the silver ammonia solution and the reducing agent are sequentially added to the dispersion of the tinned polystyrene microspheres to obtain Mixed liquid, the step of reacting the mixed liquid at 20-40° C. for 0.5-2 hours to generate the base material with surface-enhanced Raman scattering effect. The preparation method of the base material with surface-enhanced Raman scattering effect can overcome the irregular aggregation of sol-state metal nanoparticles, and the reaction conditions are mild, the requirements for equipment are low, and the process is simple.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, in particular to a method for preparing a base material with a surface-enhanced Raman scattering effect. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is an optical enhancement effect based on nanoscale rough surfaces or particle systems. Due to its high detection sensitivity, it can detect monolayer and sub-monolayer molecules adsorbed on metal surfaces. It is considered to be a surface analysis technique with broad application prospects to obtain the structural information of surface molecules. In the SERS effect, the active substrate plays a key role in the enhancement effect. Since the SERS signal itself is unstable, the reproducibility of the detection is poor, and it is difficult to directly apply it to the quantitative analysis of low-content components. Therefore, the application of SERS largely depends on How to obtain a uniform substrate with high S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/52
Inventor 胡友根赵涛梁先文朱朋莉孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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