Silver nanowire and preparation method thereof

Abstract

The invention discloses a silver nanowire and a preparation method thereof, and belongs to the technical field of precious metal powder new material preparation. The length of the silver nanowire prepared by the preparation method is 5-15 microns, and the diameter of the silver nanowire is 150-300 nm; the purity of silver nanowires is 100%, the silver nanowires can be rapidly and efficiently prepared with low energy consumption through the preparation method, silver protons formed by the silver nanowires serve as crystal nucleuses, other metal particles and other ions do not need to be additionally added, the conductive function of a silver nanowire conductive film is improved, and the preparation method is suitable for large-scale production of the silver nanowires.

Description

technical field [0001] The application relates to a nano-silver wire and a preparation method thereof, belonging to the technical field of preparation of new precious metal powder materials. Background technique [0002] Metal silver has excellent physical and chemical properties, such as electrical conductivity, thermal conductivity, strongest reflection characteristics, relatively stable chemical properties, etc., and is widely used in antibacterial materials, medical materials, electronic pastes, decorative materials, catalysts and other fields . Among them, as a one-dimensional metal nanomaterial, silver nanowires have the characteristics of large aspect ratio, good conductivity, strong light transmission, and flex resistance, and can be evenly dispersed in volatile solvents such as water, ethanol, and isopropanol. Its application fields are very wide, especially in the application of transparent electrodes, it has a tendency to replace conventional ITO (indium tin oxid...

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Problems solved by technology

However, most of the traditional polyol liquid-phase reduction methods use halide ions as nucleating agents, and there are often more silver halide particles in the nano-silver wire product, which is difficult to remove in the subsequent separation and purification process, reducing the purity of the nano-silver wire

The size of silver halide particles is usually larger than the wire diameter of nano silver wires, which may easily cause the surface of the conductive film to be uneven in the subsequent film formation process, and water and oxygen may easily invade the inside of the conductive film layer; in addition, the halide ions themselves have strong hygroscopicity. The nano-silver wire conductive film synthesized by this method is prone to subsequent oxidation and silver migration, resulting in a decrease in the conductive function of the film or even failure.

[0005] In Yuan Ximin's "Halogen-free Synthesis of Silver Nanowires and Its Application in Flexible Transparent Conductive Films", copper nitrate was added as a reaction parameter, and Cu2+ contributes to the stability of silver ten-sided twin crystals, thereby promoting the formation of nano-silver wires, but at the same time there will definitely be Cu2+ in the subsequent washing and centrifugation process The existence of silver nanowires is not conducive to the application of silver nanowires due to its easy oxidation.

In addition, in the synthesis of some silver nanowires, there are still problems such as inconvenient operation, low yield, long preparation time and high energy consumption, which are not suitable for large-scale production. Therefore, it is necessary to seek a method with simple preparation process, high production efficiency and low production cost. Nano silver wire synthesis process has important practical significance

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