摘要
Bottom-up assembly of nanostructured thin films could offer an alternative low-cost approach to elec- tronic thin films. However, such solution-processed thin films are often plagued by excessive inter-particle resistance and only exhibit limited current delivering capability. Here, we report a novel approach to fabricate highly conductive free-standing metallic thin film, accomplished by combining interfacial self-assembly of nanoparticles （NPs） and a light welding process. We found that light from a xenon lamp can weld adjacent Ag and Au NPs assembled at the water-air interface, forming a highly interconnected, free-standing metallic thin film structure with excellent electrical transport properties. With such a unique structure, the resultant thin metallic films show not only high flexibility and robustness, but also high conductivity comparable to bulk metallic thin films. Our studies offer a low-cost, room-temperature, and solution-processable approach to highly conductive metallic films. It can significantly impact solution-processable elec- tronic and optoelectronic devices.
金属薄膜在透明导电极、化学传感器、催化和光电器件等方面具有广泛应用.发展溶液加工技术可以大幅度降低金属薄膜的制作成本,灵活地调控其性能,从而促进其在多方面的应用.我们发现氙灯光源可以高效地焊接在水-气界面上自组装的金和银纳米粒子薄膜;其焊接程度取决于光照时间和光强度.最终,自组装的纳米粒子膜形成一种自支撑、高度交联的网状结构,并具有和同样厚度的体相金属薄膜相当的导电性.这一发现将纳米粒子界面自组装技术与光焊接技术相结合,可以将液相金属溶胶加工成高柔性、鲁棒性和导电性的金属粒子薄膜.这不仅可以促进金属粒子薄膜自身的应用,而且可以促进全液相加工的电子和光电器件的发展.例如,利用该金属粒子薄膜作为叉指电极的钙钛矿光电探测器展现出了良好的性能.
基金
supported by the National Natural Science Foundation of China(21673070 and 61528403)
the Opened Fund of the Chinese State Key Laboratory on Integrated Optoelectronics (IOSKL2015KF29)
Hunan University
