Silver nanowire is a kind of metal wire with nanoscale one-dimensional structure. It is regarded as the most likely to replace the traditional transparent electrode material and build a flexible transparent electrode. Possible. Recently, the research group of Professor Liang Jiajie of the School of Materials Science and Engineering of Nankai University has invented an efficient and fast silver nanowire purification method, which has achieved large-scale, rapid and effective purification of silver nanowires, greatly improving the quality of silver nanowire inks. reduce manufacturing cost. Relevant achievements were published in "Advanced Functional Materials", and Liang Jiajie was the corresponding author.
In addition to the excellent conductivity of metallic silver, silver nanowires also have excellent light transmittance and bending resistance due to the nanoscale size effect. Therefore, it is regarded as an effective material to replace traditional transparent electrode materials and to make a new generation of wearable electronic devices, and there has been a lot of research on its application to flexible OLEDs and thin-film solar cells. In addition, it also has outstanding advantages in the application of conductive adhesive, thermal conductive adhesive and printed electronic circuit. However, at present, the production cost and quality of silver nanowires are one of the main obstacles preventing them from commercializing flexible transparent electrodes.
"The performance and production cost of silver nanowire transparent electrodes are generally determined by three processes: the synthesis of silver nanowires, the purification of nanowires, and the coating of nanowire inks. Among them, the purification of nanowires controls the nanowire inks. The key steps of production time and ink quality. "Liang Jiajie introduced that traditional silver nanowire purification technology and methods, including multi-step centrifugal filtration, fiber membrane filtration, decantation and cross-flow filtration, all have cumbersome operations, numerous steps and purification Low efficiency, it takes a lot of time and solvent problems, and it is easy to produce solid precipitation, which greatly affects the preparation of printing ink and the performance of transparent electrodes. The root cause of these problems is that silver nanowires with large aspect ratios are prone to agglomeration. Through long-term experimental observations, the research team of Liang Jiajie found that how to keep the silver nanowires in motion during the purification process is the key to solving the problem of agglomeration.
Based on this, the research group innovatively used the strategy of dynamic stirring-induced centrifugal filtration, combined with the advantages of traditional membrane filtration and centrifugal filtration, and innovatively introduced the vertical filter wall technology to construct a dynamic stirring-induced centrifugal filtration separation of silver Nanowire purification device. The characteristics of this technology include: controlled centrifugal force is generated through controlled stirring; various organic and inorganic impurities in the nanowires are filtered through the positive pressure generated by the centrifugal force; and the agglomeration of nanowires can be effectively prevented through dynamic stirring and vertical filter walls to ensure Uniform dispersion of wires; a single device can simultaneously achieve efficient nanowire purification, solvent replacement, concentration and other nanowire ink configuration processes. In addition, Liang Jiajie's research group also established a set of theoretical models to guide and optimize the purification efficiency of the dynamic filtration technology.
The silver nanowire transparent electrode prepared by coating the silver nanowire ink purified by this technology does not require complicated high-temperature calcination and other post-treatment processes, and the light transmittance can be as high as 99.2%; and, according to the amount of purification, the entire dynamic purification The process takes only tens of minutes to a few hours. Compared with the traditional purification technology that takes tens of hours or even days, the purification efficiency has been greatly improved.
"We have also verified the feasibility of this dynamic filtration technology in large-scale production through the enlargement of the device, and it is expected that an important breakthrough will be made in the industrial-grade purification of nanowires in the near future." Liang Jiajie said. (Reporter Zhang Daozheng correspondent Ma Chao)
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