Simple and novel preparation method for silver and gold nano-particles

Abstract

The invention belongs to the field of nano-material preparation, and provides a simple and novel preparation method for silver and gold nano-particles. The preparation method comprises the following steps of: taking silver acetate, silver nitrate and chloroauric acid as precursor preparation raw materials, taking a sulfonic acid surfactant as a reducing agent and a protecting agent, adjusting the pH value of a preparation system by adding substances of sodium carbonate or ammonia water and the like, and heating the reaction system in a certain temperature range to obtain the silver and gold nano-particles. The product obtained by the method provided by the invention has the characteristics of being uniform in particle size, good in dispersibility and stability, and the like; moreover, the sulfonic acid surfactant is low in price and easy to get, the production process is simple and low in cost; the method is another new preparation way for preparing the silver and gold nano-particles.

Description

Technical field: [0001] The invention is a novel and convenient method for preparing silver and gold nanoparticles. It is a new preparation method of liquid phase chemical reduction method. Background technique: [0002] At present, the preparation technology of silver and gold nanomaterials is very mature and there are many preparation methods. Mainly divided into physical methods and chemical methods. Physical methods mainly include physical crushing method, vacuum condensation method, mechanical grinding ball method and other methods. Chemical methods mainly include chemical reduction method, microemulsion method, template method, electrochemical method, ultrasonic assisted reduction and other methods. For these synthesis methods, each method has its own characteristics, and it is difficult to use simple standards or other criteria to evaluate the advantages and disadvantages of a certain method. Because the requirements for silver and gold nanomaterials may vary grea...

AI Technical Summary

Problems solved by technology

[0005] In the process of preparing silver and gold nanometers, the current preparation methods still have the following disadvantages: (1) most preparation methods need to select specific reducing agents and suitable protection conditions (such as protective agents and protective atmospheres) to prepare silver, gold, and gold nanoparticles. gold nanoparticles and prevent their agglomeration

(2) The selected reducing agent and protection conditions are less economical

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