Method for preparing metal and dielectric composite grains of silicon dioxide coated by Nano silver

Abstract

This invention discloses a method for preparing metal dielectric composite particles of nanoscale Ag/SiO2. The method comprises: hydrolyzing tetraethyl orthosilicate by NH3 catalysis to prepare SiO2 microspheres, preparing AgClO4 electrolyte solutions with different concentrations, adding the prepared SiO2 microspheres into the AgClO4 electrolyte solutions, ultrasonicating in an electrolytic tank for 10min, inserting two electrodes into the electrolytic tank, applying DC to electrolyze and obtain the product, centrifuging to separate the product, washing with deionized water and ethanol repeatedly, and drying at 30-50 deg.C. This invention utilizes sonoelectrochemical method to deposit Ag nanoparticles onto the surface of SiO2 microspheres. The Ag nanoparticles are uniformly distributed onto the surface of SiO2 colloid, and have excellent potential applications.

Description

technical field [0001] The invention relates to a method for preparing nano-silver / silicon dioxide metal dielectric composite particles widely used in the fields of photonic crystals, catalysts, biosensors, etc. Silicon oxide dielectric sphere surface. Background technique [0002] Metal nanoparticles have attracted widespread attention due to their exotic properties different from traditional materials, such as chemical, optical, magnetic and electromagnetic properties. Although there are many ways to prepare metal nanoparticles, it is still difficult to maintain the stability of nanometer-sized metal particles because they have high surface energy and are prone to agglomeration. With the development of nanotechnology, people try to use various methods to solve this problem. The main method reported at present is to modify the surface of nanoparticles, but this modification often leads to an increase in particle diameter, and the coated material Performance cannot be full...

AI Technical Summary

Problems solved by technology

[0004] Most of these chemical methods reported so far have a common feature, that is, they all have to deal with SiO 2 The functionalization or physical modification of the surface of the sphere has undergone a multi-step reaction, or it is completed in a mixed solution of various reagents. The operation steps are cumbersome, time-consuming, and the product is complex or impure.

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