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Method for enhancing SERS activity of silver decahedron nanoparticles by chloroauric acid

A nanoparticle and decahedral technology is applied in the field of chloroauric acid to enhance the SERS activity of silver decahedral nanoparticles, which can solve the problems of poor stability, limited Raman enhancement effect of silver nanoparticles, and difficult storage, and achieves good stability, The effect of special product structure and low cost

Active Publication Date: 2020-03-24
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the related problems of limited Raman enhancement effect and poor storage stability of single silver nanoparticles, and there is no related report on the SERS activity of gold-deposited silver decahedral nanoparticles, so this patent covers decahedral nanoparticles Based on the introduction of chloroauric acid, the SERS activity of silver decahedral nanoparticles is enhanced by the method of depositing part of gold through displacement reaction. It is expected that this SERS technology will be applied to molecular quantitative detection, chemical and biological sensing, disease diagnosis and treatment. , catalysis and many other fields

Method used

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  • Method for enhancing SERS activity of silver decahedron nanoparticles by chloroauric acid
  • Method for enhancing SERS activity of silver decahedron nanoparticles by chloroauric acid
  • Method for enhancing SERS activity of silver decahedron nanoparticles by chloroauric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation of embodiment 1 silver decahedral nanoparticles

[0021] The experimental conditions and parameters are as follows:

[0022] 1) Weigh 1.4705g sodium citrate (Na 3 C 6 h 5 o 7 ) was dissolved in 100mL deionized water to obtain a 0.05mol / L sodium citrate aqueous solution. Weigh 0.1699g silver nitrate (AgNO 3 ) was dissolved in 100mL deionized water to obtain a 0.01mol / L silver nitrate solution. Weigh 0.076g sodium borohydride (NaBH 4 ) in a small glass bottle, take 50mL of cold water to dissolve it quickly, configure it into a 0.02mol / L sodium borohydride solution, and store it at low temperature. ;

[0023] 2) Take 1 mL of the above-mentioned sodium citrate and silver nitrate solutions respectively and mix them in a 150 mL conical flask, add 98 mL of deionized water thereto, and stir them with electromagnetic stirring at 1500 r / min for 10 min to mix well. Under the condition of vigorous electromagnetic stirring (3000r / min), 50uL of sodium borohyd...

Embodiment 2

[0026] Embodiment 2 chloroauric acid (10 -10 mol / L) etched silver decahedral nanoparticles and SERS substrates

[0027] The experimental conditions and parameters are as follows:

[0028] 1) Prepare 10 -10 mol / L concentration gradient of chloroauric acid (HAuCl 4 ) aqueous solution. Prepare 10 -4 The 4-mercaptobenzoic acid ethanol aqueous solution of mol / L is standby.

[0029] 2) Pipette gun to pipette 4mL of silver nanoparticles prepared in Example 1 into a small glass bottle, and operate under 3000r / min electromagnetic stirring throughout the whole process. After 30s, pipette 40uL deionized water and quickly inject it into the glass bottle, and continue to stir 30min; then the rotation speed was adjusted to 1000r / min, and then 400uL HAuCl was slowly and uniformly pumped in at a speed of 2mL / h with a syringe pump 4Solution, regularly measure the ultraviolet-visible light spectrum of each group of samples; finally, centrifuge at 12000r / min for 10min and remove the supern...

Embodiment 3

[0030] Embodiment 3 chloroauric acid (10 -9 mol / L) etched silver decahedral nanoparticles and SERS substrates

[0031] The experimental conditions and parameters are as follows:

[0032] 1) Prepare 10 -9 mol / L concentration gradient of chloroauric acid (HAuCl 4 ) aqueous solution. Prepare 10 -4 The 4-mercaptobenzoic acid ethanol aqueous solution of mol / L is standby.

[0033] 2) Pipette gun to pipette 4ml of silver nanoparticles prepared in Example 1 into a small glass bottle, and operate under 3000r / min electromagnetic stirring throughout the whole process. After 30s, pipette 40uL deionized water and quickly inject it into the glass bottle, and continue to stir 30min; then the rotation speed was adjusted to 1000r / min, and then 400uL HAuCl was slowly and uniformly pumped in with a syringe pump at a speed of 2mL / h 4 Solution, regularly measure the ultraviolet-visible light spectrum of each group of samples; finally, centrifuge at 12000r / min for 10min and remove the superna...

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Abstract

The invention relates to a method for enhancing the SERS activity of silver decahedron nanoparticles by chloroauric acid. Generally speaking, the silver decahedron nanoparticles (DeAgNPs) and the trivalent gold ions are subjected to replacement reaction to obtain the silver core gold shell decahedron nanoparticles with different etching degrees, the decahedron nanoparticles are transferred to a silica gel substrate to form a two-dimensional film, and the surface Raman enhancement of the silver decahedron nanoparticles to 4-mercaptobenzoic acid (4-MBA) probe molecules is realized. Results showthat the silver decahedron nanoparticles etched by chloroauric acid with different concentrations correspond to the Raman enhancement of different degrees. The method is simple in raw material and lowin cost, and is safe and simple to operate; compared with the pure silver decahedron nano particles, the silver decahedron nanoparticles etched by the chloroauric acid (HAuCl4) prepared by the methoddisclosed by the invention are special in structure and good in stability and enable the SERS activity to be improved greatly. A method for detecting a to-be-detected object of the 4-thiosalicylic acid is simple and effective, is safe in operation process, is free of pollution, and can be applied to the water quality detection, biological detection and other aspects, and has the wide applicationprospects.

Description

Technical field: [0001] The invention relates to surface-enhanced Raman spectroscopy detection technology, in particular to a chloroauric acid (HAuCl 4 ) method for enhancing the SERS activity of silver decahedral nanoparticles (DeAgNPs). In a nutshell, bimetallic nanoparticles with different etching degrees obtained by the displacement reaction of silver decahedral nanoparticles with a specific concentration of chloroauric acid solution were used as the SERS substrate to achieve the best SERS effect for 4-mercaptobenzoic acid molecular probes. . In order to realize the enhancement of the Raman signal of low-concentration substances to be detected, and realize the accurate detection of toxic and harmful substances. Background technique: [0002] SERS (Surface Enhanced Raman Scattering) is a surface spectroscopy technique. In short, SERS amplifies the Raman signal of molecules by several orders of magnitude, and the amplification of the signal is mainly realized by the elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B82Y40/00
CPCB82Y40/00G01N21/658
Inventor 郑先亮李宁杨开宇王欣刘洋于显利
Owner JILIN UNIV
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