A large-scale atmospheric pressure preparation and separation method of silver nanowires

Abstract

The invention discloses a method for preparing and separating silver nanowires under normal pressure on a large scale. First make a solution of the crystal form control agent, then take the solution of the crystal form control agent, polyvinylpyrrolidone, and polyol into the reactor, stir and heat up to obtain the first mixture, in which silver nitrate crystals are used as a reference, and the crystal form in the reactor is The mass ratio of control machine, polyvinylpyrrolidone and polyol is (5×10 ‑4 -2×10 ‑3 ): (0.7‑1.4): (50‑100); disperse silver nitrate crystals to obtain silver nitrate / polyol solution, add it to the first mixture three times, keep warm and cool to room temperature to obtain the second mixture, then add the second mixture 3-6 times the volume of absolute ethanol, after being stirred, transferred to the settling tank, by setting the height of the settling tank, adopting the method of "cutting the head and removing the tail" to stand and separate, the material of the settling tank is not the same as the silver nanowire Compatible. The preparation method of the invention is simple, the obtained silver nano wire has good dispersibility and wide application range.

Description

technical field [0001] The invention belongs to the field of preparation of silver nanowires, in particular to a method for preparing and separating silver nanowires under normal pressure on a large scale. Background technique [0002] Silver nanowire is a material in the nanometer range in at least one dimension. It has excellent optical / electrical / chemical properties. It can be used to prepare flexible transparent electrodes to replace ITO conductive glass, and can also be used for catalysis, etc., but No large-scale preparation method of silver nanowires has been disclosed in the current large-scale synthesis. [0003] Application No. 201610420466.6, titled a method for macro-preparation of monodisperse silver nanowires, specifically discloses that the method includes the following steps: 1) Silver salt, surfactant and reducing polyol solution according to 1: (0.2- 5): (0.4-50) mass ratio mixed to form a uniform reaction solution A; 2) To the reaction solution A, add a m...

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Problems solved by technology

This scheme uses a microwave oven as a heating device, which greatly limits the production capacity of a single batch, and adopts a centrifugal-drying process, which is very easy to cause agglomeration of nanomaterials due to the well-known high surface energy and aspect ratio of nanowires (see its Silver nanowire SEM in the attached picture)

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