Gu Jiahui, Wang Xuelin, Chen Hongtao, Yang Shihua, Feng Huanhuan, Ma Xing, Ji Hongjun, Wei Jun, Li Mingyu
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, People's Republic of China.
Nanotechnology. 2018 Jun 29;29(26):265703. doi: 10.1088/1361-6528/aabbbc. Epub 2018 Apr 5.
As a promising replacement material for indium tin oxide in flexible electronics, silver nanowires (AgNWs) usually need complicated post-treatment to reduce the high contact resistance across the intersections when used as transparent conductive films. In this work, a widely applicable nano-joining method for improving the overall conductivity of AgNW networks with different kinds of electrolyte solutions is presented. By treatment with an electrolyte solution with appropriate ionic strengths, the insulating surfactant layer (polyvinylpyrrolidone, PVP) on the AgNWs could be desorbed, and the AgNW network could be densified. The sheet resistance of the AgNW film on a glass slide is reduced by 60.9% (from 67.5 to 26.4 Ohm sq) with a transmittance of 92.5%. High-resolution transmission electron microscopy analysis indicates that atomic diffusion occurs at the intersection of two AgNWs. Thus, metallurgical bonding on the nanometer scale is achieved across the junctions of the AgNWs, leading to a significant enhancement in the conductivity of the AgNW network.
作为柔性电子器件中氧化铟锡的一种有前景的替代材料，银纳米线（AgNWs）在用作透明导电薄膜时，通常需要复杂的后处理来降低交叉点处的高接触电阻。在这项工作中，提出了一种广泛适用的纳米连接方法，用于使用不同种类的电解质溶液提高AgNW网络的整体导电性。通过用具有适当离子强度的电解质溶液处理，可以使AgNWs上的绝缘表面活性剂层（聚乙烯吡咯烷酮，PVP）解吸，并且可以使AgNW网络致密化。载玻片上AgNW薄膜的方阻降低了60.9%（从67.5降至26.4欧姆/平方），透光率为92.5%。高分辨率透射电子显微镜分析表明，在两根AgNW的交叉点处发生了原子扩散。因此，在AgNW的结处实现了纳米级的冶金结合，导致AgNW网络的导电性显著增强。
