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Silver nanocrystalline preparation method with surface raman enhancing effect

A surface Raman-enhanced, silver nanocrystal technology, applied in the field of materials chemistry, can solve the problems of unstable substrate, poor repeatability, limited SERS commercial application, etc., to achieve simple operation, low cost, and stable structure and morphology control. Effect

Inactive Publication Date: 2014-09-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commercial application of SERS is limited by factors such as substrate instability and poor reproducibility

Method used

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  • Silver nanocrystalline preparation method with surface raman enhancing effect
  • Silver nanocrystalline preparation method with surface raman enhancing effect
  • Silver nanocrystalline preparation method with surface raman enhancing effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Synthesis method of silver nanosol

[0020] First, dissolve 1.0g of PVP in 20ml of deionized water; add 10ml, 0.1mol / L NaOH solution and 10ml, 0.2mol / L glucose solution to the above solution in turn, stir with a glass rod; add 20ml, 0.05mol / L of silver nitrate solution, it will be observed that the solution turns black gray immediately; add the above reaction solution into a 100ml reaction kettle, and react at 140°C for 6h. The product was added to deionized water and centrifuged at 10,000 r for 10 min, the supernatant was removed, and pure deionized water was added to continue centrifugation. The powder samples were evenly loaded on a glass slide, and a certain concentration of PVP and pyridine solutions were added dropwise to test the Raman enhancement effect.

[0021] figure 1 Shows the synthesized silver nanosol with a size of 50 nm; figure 2 It shows that the synthesized silver nanocrystals have a good Raman enhancement effect on PVP, where 1 is the Raman spec...

Embodiment 2

[0023] First, dissolve 0.5g of PVP in 20ml of deionized water; add 5ml, 0.1mol / L NaOH solution and 5ml, 0.2mol / L glucose solution to the above solution in turn, stir evenly with a glass rod; add 20ml, 0.05mol / L of silver nitrate solution, it will be observed that the solution turns black gray immediately; add the above reaction solution into a 100ml reaction kettle, and react at 150°C for 6h. The product was added to deionized water and centrifuged at 10,000 r for 10 min, the supernatant was removed, and pure deionized water was added to continue centrifugation. The powder samples were evenly loaded on a glass slide, and a certain concentration of PVP and pyridine solutions were added dropwise to test the Raman enhancement effect. The size of the prepared nanoparticles is about 40 nanometers, which has a certain enhancement effect on PVP and pyridine.

Embodiment 3

[0025] First, dissolve 1.5g of PVP in 20ml of deionized water; add 15ml, 0.1mol / L of NaOH solution and 15ml, 0.2mol / L of glucose solution to the above solution in turn, stir with a glass rod; add 20ml, 0.05mol / L of silver nitrate solution, it will be observed that the solution turns black gray immediately; add the above reaction solution into a 100ml reaction kettle, and react at 130°C for 6h. The product was added to deionized water and centrifuged at 10,000 r for 10 min, the supernatant was removed, and pure deionized water was added to continue centrifugation. The powder samples were evenly loaded on a glass slide, and a certain concentration of PVP and pyridine solutions were added dropwise to test the Raman enhancement effect. The size of the prepared nanoparticles is about 60 nanometers, which has a certain enhancement effect on PVP and pyridine.

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Abstract

The invention relates to a silver nanocrystalline chemical preparation method with a surface raman enhancing effect. The method includes the steps of dissolving polyvinylpyrrolidone in deionized water to prepare a water solution, adding strong alkali and a glucose solution to the water solution, fully stirring the mixture so as to evenly disperse the strong alkali and the glucose solution, dropwise adding a silver nitrate water solution to the mixture, moving reaction liquid into a reaction kettle to react, and washing and drying the reaction product so as to obtain solver nanometer sol. According to the method, raw materials are cheap; the method is environmentally friendly; silver nanocrystalline particles in the uniform size can be obtained, and the nanometer particles have the remarkable raman enhancing effect on PVP and pyridine.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and relates to a preparation method of silver nanocrystals with surface Raman enhancement effect. Background technique [0002] Compared with bulk materials, metal nanoparticles have many unique physical and chemical properties, among which the most interesting is the surface plasmon resonance properties of metal nanocrystals. Based on the surface plasmon resonance effect, metal nanocrystals have been widely used in biological transmission. sense and surface Raman enhancement. Among them, surface-enhanced Raman scattering (SERS), as a substance analysis technique, can achieve ultra-sensitive detection in the fields of analysis, environment and catalysis. Alkali metals, noble metals and some transition metals have good surface Raman enhancement activities, among which silver nanocrystals have the best enhancement effect, followed by gold and copper. The commercial application of SERS ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00B82Y30/00C30B29/02
Inventor 何丹农尹桂林
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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