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Method for preparing cauliflower nano gold-silver alloy with surface-enhanced Raman scattering activity

A surface-enhanced Raman, cauliflower-like technology, which is applied in the field of preparation of cauliflower-like nano-gold-silver alloys, can solve the problems of poor SERS signal reproducibility and poor stability, and achieves low cost, simple preparation method, and surface-enhanced Raman technology. effect of effect

Inactive Publication Date: 2011-09-14
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a cauliflower-shaped nano-gold-silver alloy with surface-enhanced Raman scattering activity, so as to solve the problems of poor stability and poor reproducibility of SERS signals in the prior art

Method used

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  • Method for preparing cauliflower nano gold-silver alloy with surface-enhanced Raman scattering activity
  • Method for preparing cauliflower nano gold-silver alloy with surface-enhanced Raman scattering activity
  • Method for preparing cauliflower nano gold-silver alloy with surface-enhanced Raman scattering activity

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Dissolve 0.0255g of silver nitrate in 150ml of three times deionized water, then add 5ml of 0.001mol / L sodium phytate solution; heat rapidly to boiling, and finally slowly add 3ml of 1% trisodium citrate, and keep the reaction temperature at 90 °C, react for 3 hours. Take 15mL of the above silver nanoparticles in a 25mL beaker, heat the solution to 50°C under constant stirring, and slowly add 2mL of 0.01mol / L perchloroauric acid dropwise. The temperature was controlled at 50° C., and the reaction was carried out under stirring for 25 minutes.

Embodiment 2

[0023] Dissolve 0.0255g of silver nitrate in 150ml of three times deionized water, then add 5ml of 0.001mol / L sodium phytate solution; heat rapidly to boiling, and finally slowly add 3ml of 1% trisodium citrate, and keep the reaction temperature at 100 ℃, reacted for 3 hours, took 12-17ml of the above-mentioned nano-silver cluster dispersion in a 25ml beaker, heated the solution to 45℃ under stirring, slowly added 2.4ml of 0.01mol / L perchloroauric acid, and stirred for 35 A sample was prepared after 1 minute.

Embodiment 3

[0025] Dissolve 0.0255g of silver nitrate in 150ml of deionized water for three times, then add 5ml of 0.001mol / L sodium phytate solution; quickly heat to boiling, and finally slowly add 3ml of 1% trisodium citrate, and keep the reaction temperature at 98 ℃, react for 3 hours, take 16ml of the above nano-silver cluster dispersion in a 25ml beaker, heat the solution to 50℃ under stirring, slowly add 1.5ml of 0.01mol / L perchlorauric acid dropwise, and stir for 30 minutes Prepare samples.

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Abstract

The invention discloses a method for preparing cauliflower nano gold-silver alloy with a surface-enhanced Raman scattering activity, which comprises: mixing 0.001mol / L solution of silver nitrate and 0.001mol / L solution of sodium phytate in a volume ratio of 30:1; heating the mixed solution till the mixed solution boils and keeping the temperature between 90 and 100 DEG C; adding 1 percent solution of trisodium citrate in an amount which is one fiftieth of the volume of the solution of silver nitrate to perform an reaction at 90 to 100 DEG C for 3 hours to prepare nano silver cluster dispersion stabilized by phytic acid; and transferring 12 to 17 milliliters of dispersion into a 25 milliliter beaker, heating the solution to 45 to 65 DEG C with stirring, slowing dripping 1.5 to 2.4 millimeters of 0.01 mol / L solution of chloroauric acid and stirring the mixed solution for 25 to 35 minutes to obtain a sample. The obtained cauliflower nano gold-silver alloy nanoparticles can keep stable for more than 6 months and has high signal repeatability and a surface-enhanced Raman effect. The preparation method is simple and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a cauliflower-shaped nano-gold-silver alloy, in particular to a method for synthesizing a stable cauliflower-shaped nano-gold-silver alloy with surface-enhanced Raman scattering activity through reduction of nano-silver clusters. Background technique [0002] Recently, bimetallic nanoparticles have attracted increasing attention because of their physical and chemical properties different from those of single-component metal nanoparticles. For example, the catalytic performance of bimetallic nanoparticles is significantly better than that of single-component metal nanoparticles; and their optical properties are adjustable with the ratio of the two metal components. In particular, silver-gold bimetallic nanoparticles have adjustable absorption peaks in the ultraviolet-visible range due to the difference in silver and gold components; and their surface area is more conducive to the adsorption of molecules, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 杨海峰王娜
Owner SHANGHAI NORMAL UNIVERSITY
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