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Method for preparing silver nano-wire and SERS detection method using silver nano-wire as substrate

A technology of silver nanowires and a detection method, applied in the fields of nanomaterials and analysis and detection, can solve the problems of application of silver nanowires, increase production cost, environmental pollution, etc., and achieve the effects of simplifying production process, increasing reaction temperature, and avoiding environmental pollution.

Active Publication Date: 2017-01-04
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acetone washing (such as CN101934378A) is required for the subsequent purification of silver nanowires prepared by polyol method, which brings environmental pollution and increases production costs
Moreover, in the silver nanowires prepared by the prior art polyol method, there are more silver nanoparticles (such as CN1740405A, CN101310899A) mixed in, which makes the prepared silver nanowires not suitable for the detection of higher quality requirements. field

Method used

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  • Method for preparing silver nano-wire and SERS detection method using silver nano-wire as substrate
  • Method for preparing silver nano-wire and SERS detection method using silver nano-wire as substrate
  • Method for preparing silver nano-wire and SERS detection method using silver nano-wire as substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 is the preparation of silver nanowires under the optimal technical scheme, and Examples 2, 3, and 4 are control experiments after changing the synthesis conditions of silver nanowires. The silver nanowires used in the SERS detection in subsequent examples 5, 6, 7, 8, and 9 were prepared by the method in example 1.

[0040] Example 1

[0041] Take 5.67g of PVP powder with Mw=55000 (51.1mmol based on the monomer with a molecular weight of 111), add it to 190mL of glycerol, then raise the temperature to 85°C and stir slowly until the powder is completely dissolved to form a transparent solution, then dissolve the solution Cool down to 30°C, add 1.58g (9.3mmol) of silver nitrate crystals to the solution, and use mechanical stirring to assist with ultrasound to dissolve the silver nitrate crystals to obtain solution A containing silver nitrate, PVP and glycerin.

[0042] Weigh 58.5 mg (1 mmol) of sodium chloride and dissolve it in 0.5 mL of distilled water, add 10...

Embodiment 2

[0046] Take 0.516g of PVP powder with Mw=55000 (4.65mmol based on the monomer with a molecular weight of 111), add it to 170mL of glycerol, heat up to 70°C and stir slowly until the powder is completely dissolved and becomes a transparent solution, then cool the solution to 20°C ℃. Add 1.58g (9.3mmol) silver nitrate crystals to the solution, and use mechanical stirring to assist with ultrasound to dissolve the silver nitrate crystals to obtain solution A containing silver nitrate, PVP and glycerin.

[0047] Weigh 46.8 mg (0.8 mmol) of sodium chloride and dissolve it in 0.5 mL of distilled water, then add 8 mL of glycerol to dilute the sodium chloride solution to obtain solution B. Add solution B to solution A, heat with a water heater, start stirring and raise the temperature to 200°C within 20 minutes, then stop heating immediately, and cool to room temperature naturally.

[0048] The reaction solution was added to ultrapure water for centrifugal washing, and then washed thr...

Embodiment 3

[0051] Take 3.09g of PVP powder with Mw=55000 (27.8mmol based on the monomer with a molecular weight of 111), add it to 185mL of glycerol, heat up to 80°C and stir slowly until the powder is completely dissolved and becomes a transparent solution, then cool the solution to 25 °C, add 1.58g (9.3mmol) silver nitrate crystals to the solution, and use mechanical stirring to assist with ultrasound to dissolve the silver nitrate crystals to obtain solution A containing silver nitrate, PVP and glycerin.

[0052] Weigh 58.5 mg (1 mmol) of sodium chloride and dissolve it in 0.5 mL of distilled water, add 10 mL of glycerol to dilute the sodium chloride solution to obtain solution B. Add solution B to solution A, heat in a water heater, start stirring and raise the temperature to 205°C within 15 minutes, then stop heating immediately, and cool down to room temperature naturally.

[0053] Add the reaction liquid to ultrapure water and wash it by centrifugation, then use water, 30% ethanol...

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Abstract

The invention belongs to the field of nano materials and analysis and detection, and relates to a silver nano-wire and an SERS (Surface-Enhanced Raman Scattering) detection method using the silver nano-wire as a substrate. A preparation method of the silver nano-wire adopts a polyol method and takes silver nitrate as a raw material to prepare the silver nano-wire, the polyol used by a reaction is selected from glycerol, and the reaction temperature is improved; compared with the prior art, the reaction time is shortened, an inert protective gas atmosphere is not needed, and an after-treatment process is optimized; and the length and diameter distribution range of the prepared silver nano-wire is relatively narrow, and the application range of the silver nano-wire in the field of analysis and detection is widened. The invention also relates to an SERS detection method using the prepared silver nano-wire as a substrate. The method is applied to detection of common aquatic product prohibited drugs, and compared with the prior art, the method has the advantages of higher sensitivity, lower detection limit and lower cost.

Description

technical field [0001] The invention relates to the field of nanomaterials and analysis and detection, in particular to a silver nanowire and a SERS detection method using the silver nanowire as a substrate. Background technique [0002] With the gradual improvement of China's economic level, aquatic products are no longer used as exclusive food for people in coastal and lake areas, but are processed and transported or even transported live to all parts of the country for sale. At the same time, some southern provinces with breeding conditions are also constantly promoting artificial aquatic products farming. However, the artificial breeding and live transportation of aquatic products make the fish out of the natural growth environment, and are prone to disease and death. [0003] In order to improve the survival rate and health status of artificial breeding of aquatic products, some farmers add illegal drugs to aquatic products regardless of the public interest. Common aq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00G01N21/65B82Y40/00
CPCG01N21/658B82Y40/00B22F9/24G01N2021/655B22F1/07B22F1/0547
Inventor 赖克强黄轶群樊玉霞宋佳赵志慧
Owner SHANGHAI OCEAN UNIV
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