Method for synthesizing superfine silver nanowires through light triggering conducted in aqueous solution

Abstract

The invention discloses a method for synthesizing superfine silver nanowires through light triggering conducted in an aqueous solution. The method comprises the steps of heating a mixed solution of sodium citrate and polyvinylpyrrolidone, so that the mixed solution has reducibility; adding a silver nitrate solution, and meanwhile conducting illumination with blue light to trigger nucleation; then screening seed crystals with hydrogen peroxide as an etching agent, so that small silver nanowire seed crystals high in purity are obtained; and conducting three cycles of continuous growth, so that the superfine silver nanowires with the diameter ranging from 8 nm to 20 nm and the length ranging from 1 micron to 30 microns are obtained. By means of the method, the blank of silver nanowires with the diameter ranging from 10 nm to 20 nm is filled up; the superfine silver nanowires prepared through the method are quite suitable for being used for preparing transparent conducting thin films; and the haze situation caused by the large diameter of a nanowire can be effectively improved. Compared with a traditional polyhydric alcohol method, the method is easy to operate and short in experimental cycle.

Description

technical field [0001] The invention belongs to the fields of nanomaterials, waveguides and thin film devices, and in particular relates to a synthesis method of ultrafine silver nanowires. Background technique [0002] Silver nanowires have excellent electrical and thermal conductivity, as well as the surface plasmon effect that bulk materials do not have. They interact with light to form surface plasmon resonance, which converts the energy of light into the collective vibration of free electrons on the silver surface. It can achieve strong absorption in the ultraviolet and visible light bands, has good light transmission, and is widely used in the field of thin film devices; at the same time, silver nanowires can excite electromagnetic waves propagating at the interface between metal and medium, and can realize the transmission of light. It is widely used in the field of surface plasmon waveguides, and can be used to realize photoelectric multiplexing or photoelectric hybr...

AI Technical Summary

Problems solved by technology

The nanowires prepared by this method have a high yield and a long length, up to hundreds of microns; however, due to the rapid reduction of silver ions in the ethylene glycol system, the generated multiple twin crystal seeds are large and nucleate The stage and the growth process are carried out simultaneously, resulting in the formation of the crystal nucleus and the rapid growth of the nucleus. The diameter of the prepared nanowire is thick, generally greater than 40nm, and the haze of the thin film device is generally above 5%, which is far from meeting the requirements of high-performance thin film devices. requirements

This method is mainly based on the precise control of seed yield and yield to achieve controllable growth. However, the growth process of seeds is easily disturbed by uncontrollable factors such as additives, drug purity, temperature, humidity, and contact with air. It has a fatal impact on the reaction of the nucleation stage, which makes it difficult to accurately control the key step of the experiment, that is, the seed formation stage, and the experiment is difficult to repeat and cannot be applied.