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

A surface-enhanced Raman and cauliflower-shaped technology, which is applied in the field of preparation of cauliflower-shaped nano-gold-silver alloys, can solve problems such as poor stability and poor reproducibility of SERS signals, and achieve low cost, surface-enhanced Raman effect, and signal reproduction. good effect
CN101786170AInactive Publication Date: 2010-07-28SHANGHAI NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI NORMAL UNIVERSITY
Publication Date
2010-07-28
Estimated Expiration
Not applicable · inactive patent

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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.
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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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