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A preparation method of surface-enhanced Raman scattering substrate based on nano-silver particles

A surface-enhanced Raman and nano-silver particle technology, which is applied in Raman scattering, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of poor stability of Raman testing, difficulty in Raman detection, and Mann enhancement is limited and other problems, to achieve the effect of stability guarantee, good monodispersity and high utilization rate

Active Publication Date: 2019-12-13
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the added analyte will change the surface properties of nano-silver, resulting in agglomeration of nano-silver, and although the agglomeration of nano-silver will have a positive impact on SERS enhancement to a certain extent, the uncontrollable degree of agglomeration determines the experimental results. Low repeatability, making it difficult for Raman detection
In addition, if the suspension of particles is used for detection, the Raman enhancement obtained is limited due to the dilution of the analyte.
If the particle solution is evaporated to dryness and tested, the stability of the Raman test is not good due to the coffee ring effect after evaporation

Method used

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  • A preparation method of surface-enhanced Raman scattering substrate based on nano-silver particles
  • A preparation method of surface-enhanced Raman scattering substrate based on nano-silver particles
  • A preparation method of surface-enhanced Raman scattering substrate based on nano-silver particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Configure silver-ammonia complex solution A: Weigh 85 mg of silver nitrate and dissolve it in 50 ml of deionized water (to obtain a 0.01mol / L silver nitrate solution), then slowly add ammonia water dropwise and stir while adding, at this time the solution A brown precipitate will be produced first, and with the dripping of ammonia water, the precipitate will gradually dissolve, and stop adding ammonia water when the solution becomes clear again.

[0023] (2) Prepare glucose solution B: Weigh 9 g of glucose and dissolve in 50 ml of deionized water (to obtain a 1 mol / L glucose solution).

[0024] (3) Take 0.1ml of silver-ammonia complex solution A and add 50ml of solution B, stir and let it stand, and obtain golden yellow nano-silver particle solution C after 0.5h.

[0025] (4) In order to make the cured Raman substrate have the same thickness and shape, in this embodiment, the adhesive tape is punched and pasted on the glass slide, 0.5ml solution C is dropped in the ...

Embodiment 2

[0027] (1) configure silver ammonia complex solution A: same as Example 1

[0028] (2) Preparation of glucose solution B: Weigh 4.5 g of glucose and dissolve in 50 ml of deionized water (to obtain a 0.5 mol / L glucose solution).

[0029] (3) Add 0.01 ml of solution A to solution B every 30 minutes, and obtain golden yellow silver nanoparticle solution C 6 times in total. Each UV-visible absorption spectrum is measured as image 3 shown. After adding in batches, the absorption peaks of the nano-silver particle solution are all around 410nm, and the absorbance increases with the increase of solution A. It can be seen that the number of nano-silver particles has increased, but the diameter of the particles has not changed.

[0030] (4) Take the above solution C and add it dropwise into a beaker and completely cover the bottom of the beaker, and dry it at room temperature or high temperature until it is completely solidified into a film. The Raman active substrate thus cured was...

Embodiment 3

[0032] (1) configure silver ammonia complex solution A: same as Example 1

[0033] (2) Prepare glucose solution B: Weigh 0.9 g of glucose and dissolve in 50 ml of deionized water (to obtain a 0.1 mol / L glucose solution).

[0034] (3) Get 0.05ml silver ammonia complex solution A and add solution B, leave standstill after stirring, obtain golden yellow nano-silver particle solution C after 0.5h, its ultraviolet-visible absorption spectrum is as follows Figure 5 shown.

[0035] (4) Take the above solution C and add it dropwise into a petri dish and completely cover the bottom of the petri dish, and dry it at room temperature or high temperature until it is completely solidified into a film. The Raman active substrate thus cured was spread flat on the bottom of the petri dish.

[0036] In the above 3 embodiments:

[0037] 1. The silver nitrate can be replaced by soluble silver compounds, such as silver acetate, silver sulfate and the like.

[0038] 2. The glucose can be repla...

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Abstract

The invention discloses a low-cost green chemical synthesis method for nano-silver particles and a preparation method for a surface raman-enhanced active substrate based on the nano-silver particles. By utilizing the principle that silver ions are reduced by aldehyde groups in a silver mirror reaction, a trace amount of a silver-ammino complex solution is added into an aldehyde-group-contained compound solution with a certain concentration at the room temperature, so that the silver ions are reacted fully and reduced into elemental silver and generate the nano-silver particles. The nano-silver particles obtained by adopting the chemical synthesis method are even in particle size (diameters are between 35 nm to 38 nm), and good in monodispersity. Then, a synthetic nano-silver particle solution is directly dropped on a glass sheet or other carrier such as a silicon slice and an organic polymer film, after the solution is evaporated to be dry completely, a coffee-ring effect after a liquid drop is evaporated to be dry is effectively inhibited because of existing of excess glucose, and moreover the excess glucose severs as a protective layer to prevent the nano-silver particles from being oxidized, and thus the surface raman-enhanced active substrate with the good stability is obtained.

Description

technical field [0001] The invention relates to a method for chemically synthesizing nano-silver particles and a method for preparing a surface Raman-enhanced active substrate based on nano-silver particles. Background technique [0002] Nanomaterials are a rapidly developing new type of materials, which are widely used in many fields such as industry, agriculture and people's lives. As an important branch of nanomaterial research, metallic nanomaterials are represented by precious metals such as gold, silver, and copper, among which nanosilver has received the most attention because of its broad application prospects. Because nano silver has very stable physical and chemical properties, it has excellent performance in electronics, optics, antibacterial and catalysis, and can be widely used in catalyst materials, battery electrode materials, optical materials, antibacterial materials, coatings, etc. [0003] Regarding the preparation method of nano-silver particles, the key...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y30/00B82Y40/00G01N21/65
CPCB22F9/24B82Y30/00B82Y40/00G01N21/658
Inventor 吴文刚朱佳潘旖旎
Owner PEKING UNIV
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