Recently, researchers from the Institute of Solid State Physics at the Chinese Academy of Sciences' Hefei Institute of Materials Science discovered a simple new method for the preparation of ultra-high aspect ratio silver nanowires, and prepared them on the basis of high quality silver nanowire materials obtained. The transparent conductive film with excellent optical/electrical performance was applied to the transparent heater, and the performance of heater heating temperature and response time was successfully controlled.
Silver nanowires have been widely studied as a new type of transparent conductive thin film material. However, it is difficult to control the structure parameters of silver nanowires. In particular, high-end electronic devices such as touch screens require silver nanowires with a diameter of less than 40 nm and an aspect ratio of more than 800, which are very challenging for the preparation of such silver nanowires. High-quality silver nanowires and transparent conductive films can meet the fast response requirements of touch devices and transparent heaters.
Researchers at the Institute of Solids Research Ye Changhui's graduate student Yanyun Xia and others have overcome the difficulty of single chain length PVP surfactants that are not conducive to the regulation of diameter and aspect ratio of silver nanowires. By using mixed chain length PVP as a surfactant, at atmospheric pressure, low The diameter of the silver nanowires was greatly reduced at the temperature, and finally a silver nanowire having a diameter of ~25 nm and an aspect ratio of >1000 was obtained (Fig. 1). Using this ultra-fine and ultra-large aspect ratio silver nanowires, a transparent conductive film with excellent optical/electrical properties was prepared, which provided a possibility to replace the traditional ITO to realize a new generation of flexible optoelectronic devices. The relevant results were published in the Chemical Communications magazine of RSC publishers (Chem. Commu 2014, 50, 14877-14880) and applied for a national invention patent.
Based on the excellent performance of silver nanowire transparent conductive films, Dr. Ji Shulin of the research group produced a rapid response transparent heater and achieved rapid and uniform heating within 1 minute. It was found that the temperature coefficient of the resistance of the transparent heater has an important influence on the thermal response time and the heat exchange coefficient. The resulting fast-response transparent heater can be applied to dehaze glass, sensors, or thermochromic substrates (Figure 2). The relevant results were published in the Small magazine of Wiley publishers (Small 2014, 10, 4951) and applied for a national invention patent.
The above research was funded by the National Major Scientific Research Program, the National Natural Science Foundation of China, and the 100-person project of the Chinese Academy of Sciences.
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