A kind of silver nanowire with high aspect ratio and preparation method thereof

Abstract

The invention provides a silver nanowire with a high aspect ratio and a preparation method thereof. Firstly, ethylene glycol is pretreated, and anhydrous magnesium sulfate is added to dry and remove water, and then distilled to obtain ethylene glycol for use. The silver source AgNO 3 Sieve through a sieve to obtain a fine powder as a silver source for the reaction; add two kinds of alkali metal halide salts during the reaction to inhibit the formation of silver particles in the reaction, increase the yield, and accurately control the amount of PVP and the temperature gradient and speed in the reaction. The wire length and wire diameter of the silver wire are controlled; the whole reaction is carried out under the condition of an ambient humidity of 30-60%, and an ultra-fine silver nanowire with an average wire diameter of about 25nm, a wire length of about 40 μm, and an aspect ratio of up to 1500 can be obtained. This method is simple to operate, has few by-products, high yield, and good repeatability. It has been successfully scaled up to 14L reaction, so it is very easy to carry out large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of nanomaterial synthesis, and relates to the synthesis of silver nanowires, in particular to a silver nanowire with a high aspect ratio and a preparation method thereof. Background technique [0002] As the core components of electronic products such as solar cells, touch screens, and flat panel displays, transparent conductive films have a very large market space. Due to the shortage of indium element, the price of indium tin oxide (ITO), which is widely used at present, continues to rise. Therefore, it is necessary to develop a new type of transparent conductive film to replace ITO. Silver nanowire transparent conductive film is superior to ITO transparent conductive film in terms of the three most critical characteristics, that is, lower manufacturing cost, smaller sheet resistance, and better flexibility. Therefore, whether it is in high-end applications, such as flat panel Control panels, solar cells, etc., or ...

AI Technical Summary

Problems solved by technology

The preparation of silver nanowires with controllable wire diameter and wire length has always been a difficulty that limits the application of silver nanowires. The silver nanowires prepared by existing methods are easily doped with more silver nanoparticles and the aspect ratio of nanowires is not enough for practical applications.

The cost of the template method is high, the operation is complicated, and it is difficult to produce on a large scale

Moreover, after expanding the production, the two stages of seed crystal formation and linear growth interfere with each other, which is difficult to control, resulting in low yield and poor repeatability of silver nanowires

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