Ag nanowires: large-scale synthesis via a trace-salt-assisted solvothermal process and application in transparent electrodes
Ag nanowires: large-scale synthesis via a trace-salt-assisted solvothermal process and application in transparent electrodes
复制标题
DOI：
10.1007/s11051-013-1588-3
复制
发表时间：
2013-04-01
影响因子：
2.5
通讯作者：
Suganuma, Katsuaki
中科院分区：
文献类型：
--
作者：
Jiu, Jinting;Sugahara, Tohru;Suganuma, Katsuaki
银纳米线（AgNW）薄膜作为有望取代氧化铟锡材料的新型透明导电薄膜受到越来越多的关注。然而，在合成过程中用聚乙烯吡咯烷酮 (PVP) 和其他杂质涂覆 AgNW 表面会导致导线之间产生较大的接触电阻，从而在没有额外处理将重叠的 AgNW 熔合在一起的情况下导致电导率较低。在目前的工作中，我们展示了一种简单的方法，通过使用 PVP 作为还原剂，辅以微量盐乙醇还原 AgNO3 来合成 AgNW。 AgNW 的形状和产率很大程度上取决于这些痕量盐的浓度和反应温度。银纳米线的长度约为5-20μm，并且表现出约70nm的均匀直径。根据通过改变这些合成参数记录的观察结果，提出了 AgNW 的详细生长机制。此外，AgNW用于形成透明薄膜，未经任何额外处理，其方块电阻为10.4Ω/sq，在550nm处的透射率为81.9％。薄膜的性能归因于AgNW表面的微量残留杂质以及溶剂热工艺制备的线材的特殊V形形貌。
Ag nanowire (AgNW) films are receiving increasing attention as new transparent conductive films poised to replace indium tine oxide materials. However, coating of AgNW surfaces with polyvinylpyrrolidone (PVP) and other impurities during synthesis causes large contact resistance between the wires leading to low conductivities in the absence of additional treatments to fuse the overlapped AgNWs together. In the present work, we demonstrated a simple method to synthesize AgNWs by the reduction of AgNO3 using PVP as the reducing agent assisted by trace amounts of salts in ethanol. The shape and yield of the AgNWs depended significantly on the concentrations of these trace salts and on reaction temperatures. The silver nanowires were about 5-20 mu m in length and showed a uniform diameter of about 70 nm. A detailed growth mechanism of the AgNWs has been proposed on the basis of the observations recorded by varying these synthesis parameters. Further, the AgNWs were used to form a transparent film, which without any additional treatments showed a sheet resistance of 10.4 Omega/sq and a transmittance of 81.9 % at 550 nm. The performance of the films was attributed to the trace amounts of residual impurities on the surface of the AgNWs and to the special V-shaped morphology of the wires prepared with the solvothermal process.