Simple and fast preparing process for Au-Ag complex nanometer particles

Abstract

The invention discloses a simple and rapid method for preparing Au-Ag complex nanometer particles, which adopts one-step liquid phase deoxidizing method at room temperature to prepare Au-Ag complex nanometer particles. The specific method is that: sequentially add gold chloric acid solution and sodium citrate solution into colorimetric tube; then, respectively add silver nitrate solution into the colorimetric tube, making that Au3+: Ag+ in the tube is 1:9 to 9:1; then add ascorbic acid and shake, thus the Au-Ag complex nanometer particles is obtained. The method has the advantages that: 1) comparing with the current method, the preparation method is simple with mild reaction conditions, and does not need the assistant means of laser induction and ultrasonic processing; the Au-Ag complex nanometer particles can be prepared at room temperature, and the diameter of nanometer particles can be regulated by regulating the proportion of Au and Ag; 2) the deoxidizing agent of ascorbic acid and the stabilizing agent of sodium citrate solution are easily obtained with low cost.

Description

Technical field: [0001] The invention relates to Au-Ag composite nanoparticles, in particular to a simple and rapid method for preparing Au-Ag composite nanoparticles. Background technique: [0002] At present, it has been found in many studies that gold nanoparticles have very good monodispersity, and Ag sol has a high SERS enhancement factor compared with gold sol; in addition, silver nanoparticles have a strong ultraviolet absorption peak at 400nm, so It is very meaningful to observe the optical phenomenon of silver. However, it is difficult to control the shape and size of silver nanoparticles during the preparation process, so the quantitative research on the SERS effect is greatly limited. Through a large number of studies, it is found that the size of Au-Ag composite nanoparticles is relatively easy to prepare according to requirements, so the preparation The gold-silver composite nanoparticles that can control the particle size and have the monodispersity of gold na...

AI Technical Summary

Problems solved by technology

However, it is difficult to control the shape and size of silver nanoparticles during the preparation process, so the quantitative research on the SERS effect is greatly limited. Through a large number of studies, it is found that the size of Au-Ag composite nanoparticles is relatively easy to prepare according to requirements, so the preparation Gold-silver composite nanoparticles that can control the particle size and have the monodispersity of gold nanosol and the high surface-enhanced Raman effect (SERS) of silver nanosol have a wide range of application values

The synthesis of gold-silver composite nanoparticles reported so far requires conditions such as ultrasonic treatment, laser induction, and radiochemical treatment. Some of these methods have cumbersome steps, and some conditions require strict control and are not easy to operate.

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