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Preparation method for gold-silver alloy nanometer particles

A gold-silver alloy and nanoparticle technology, applied in the field of material chemistry, can solve problems such as surface susceptibility, affecting SERS effect, etc., and achieve the effects of short time consumption, increased active sites, and strong Raman enhancement effect.

Inactive Publication Date: 2013-03-13
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to effectively control the distance between nanoparticles to generate more active sites, it is necessary to add some kind of cross-linking agent during the reaction process. However, most of the cross-linking agent molecules are organic compounds, resulting in the surface of the nanoparticles after adding the analyte. Susceptibility, affecting the improvement of its SERS effect

Method used

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  • Preparation method for gold-silver alloy nanometer particles
  • Preparation method for gold-silver alloy nanometer particles
  • Preparation method for gold-silver alloy nanometer particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 7.5mL of chloroauric acid with a concentration of 0.2428mmol / L and 22.5mL of silver nitrate, put it into a beaker, stir continuously and heat to 90°C, add 4mL of sodium phytate under slight boiling, the concentration of sodium phytate is 10 -3 mol / L, continue stirring and heating for 10 minutes, add 0.2 mL of trisodium citrate with a mass concentration of 1%, and heat for 1 hour under constant stirring at a heating temperature of 90°C, the color of the solution turns light red. This reaction solution was labeled as sample 1 and stored at 4°C.

Embodiment 2

[0028] The chloroauric acid solution and silver nitrate in embodiment 1 are mixed according to the ratio of 1:1 according to the volume ratio, namely chloroauric acid solution 15mL, silver nitrate solution is also 15mL, other preparation conditions are all constant, make red solution, will The reaction solution was marked as sample 2 and stored at 4°C.

Embodiment 3

[0030] The chloroauric acid solution and silver nitrate in Example 1 are mixed according to the volume ratio of 3:1, i.e. chloroauric acid solution 22.5mL, silver nitrate solution is also 7.5mL, other preparation conditions are all constant, dark red color is obtained solution, the reaction solution was labeled as sample 3, and stored at 4°C.

[0031] Characterization of gold-silver alloy nanoparticles:

[0032] (1) Changes in UV-Vis absorption spectrum during the preparation of alloy nanoparticles of sample 3

[0033] During the preparation of sample 3, after adding 0.2 mL of trisodium citrate to the mixed solution, a reduction reaction occurred in the solution for a total of 1 hour. Sampling and analysis were carried out in five different reaction time periods when the reduction reaction occurred in 20 minutes, 30 minutes, 40 minutes, 50 minutes and 60 minutes, and the samples were put into the ultraviolet spectrophotometer for detection. Specific as figure 1 shown. As c...

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Abstract

The invention belongs to the technical field of material chemistry and particularly relates to a preparation method for gold-silver alloy nanometer particles. The preparation method comprises the steps as follows: mixing a silver nitrate solution with a chloroauric acid solution, stirring and heating; adding a sodium phytate solution and continuing to stir and heat; adding a trisodium citrate solution for reaction to prepare a gold-silver alloy nanometer sol; and cooling and refrigerating for storage. The molar ratio of the silver nitrate to the chloroauric acid to the sodium phytate is 1 to 0.25-3.5 to 1-4, and the silver nitrate, the chloroauric acid and the sodium phytate are stirred and heated to be 80-90 DEG C. The volume of the trisodium citrate is 0.8-2.6% of that of the silver nitrate solution. The preparation process is simple, convenient and short in time consumption; the sodium phytate is added in the preparation process, so that the effect of a bridging agent is achieved, the quantity of active sites between the nanometer particles are increased, and the stronger Raman enhancement effect is obtained; and the detection accuracy and sensitivity of the gold-silver alloy nanometer particles are high, the commonality is strong, and various analyte molecules can be subjected to Raman detection.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a preparation method of gold-silver alloy nanoparticles. Background technique [0002] In recent years, bimetallic nanoparticles, especially gold-silver alloy nanoparticles, have attracted more and more attention because of their unique optical and chemical properties. Gold can only have a good enhancement effect in the near-infrared region, and silver can enhance it well in the ultraviolet and visible light regions. The reason for this difference is due to the problem of the plasmon resonance peak of gold and silver, and the gold-silver alloy has a special Photoelectric properties, the optical properties of gold-silver alloy nanoparticles are adjustable in the ultraviolet-visible range with the difference of the ratio of the two components, and its surface properties are more conducive to the adsorption of molecules, with strong surface-enhanced Raman scat...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 杨海峰郭小玉
Owner SHANGHAI NORMAL UNIVERSITY
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