Preparation method of metal nanoparticles

Abstract

The invention discloses a preparation method of metal nanoparticles. The preparation method comprises the steps: electrolyzing a conductive solution contacted with metal oxides by utilizing an electrochemical technique, and reacting the conductive solution with the metal oxides, thereby obtaining the metal nanoparticles. The metal nanoparticles prepared by the method have controllable particle size and morphology and controllable area coverage in which the nanoparticles exist. Moreover, the preparation method is simple, the cost is low, large-scale production can be realized, any hazardous substance is not produced in the whole process, and the green production principle is met.

Description

technical field [0001] The invention relates to the technical field of preparation of nanomaterials, in particular to a preparation method of metal nanoparticles. Background technique [0002] Due to their unique properties, such as quantum size effect, surface effect, interface effect, volume effect, small size effect, macroscopic quantum tunneling effect, etc., nanoparticles have attracted extensive attention in the field of materials and catalysis. An important basis for the research and application of material properties. [0003] For example, indium nanoparticles have unique optical properties and can be used in superconducting materials, catalysts, electronic devices, gas sensors, surface-enhanced Raman scattering, and solar cells. Many applications of indium nanoparticles are closely related to the surface plasmon resonance generated when they interact with light, that is, there are a large number of free electrons on the surface of metal particles. When light hits t...

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Problems solved by technology

At present, it can be divided into two categories. The first category of physical methods includes laser ablation method, ultrasonic radiation method, thermal evaporation method, liquid phase dispersion method, etc. These methods have uncontrollable particle size and require complex experimental equipment. and other shortcomings, the other is chemical methods, including sodium reduction, reduction of metal salts in ionic liquids, decomposition of organometallic precursors, etc. The raw materials used in these methods are costly and toxic, so traditional preparation methods have defects

[0004] For example, gold nanoparticles have become one of the research hotspots in the field of nanomaterials due to their outstanding catalytic properties. The commonly used method for preparing gold nanoparticles is to use citric acid or chitosan for oxidation-reduction reactions, but higher temperatures are required. The lower reaction, the preparation process is more complicated, and it is difficult to achieve large-area preparation

[0005] Generally speaking, the current methods for preparing nanoparticles mainly include chemical precipitation method, template method, sol-gel method, etc. However, the particle size of metal nanoparticles prepared by chemical precipitation method is usually large and it is difficult to control the size. It is cumbersome, especially it is difficult to remove the template, and the metal nanoparticles obtained by the sol-gel method are easy to agglomerate, which affects the effect of use

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