Ko Yeongun, Song Seung Keun, Kim Nam Hee, Chang Suk Tai
School of Chemical Engineering and Materials Science, Chung-Ang University , Seoul 156-756, Republic of Korea.
Langmuir. 2016 Jan 12;32(1):366-73. doi: 10.1021/acs.langmuir.5b03251. Epub 2015 Dec 21.
We report an effective method for fabricating highly transparent and stretchable large-area conducting films based on a directional arrangement of silver nanowires (AgNWs) driven by a shear force in a microliter-scale solution process. The thin conducting films with parallel AgNWs or cross-junctions of AgNWs are deposited on the coating substrate by dragging a microliter drop of the coating solution trapped between two plates. The optical and electrical properties of the AgNW thin films are finely tuned by varying the simple systematic parameters in the coating process. The transparent thin films with AgNW cross-junctions exhibit the superior electrical conductivity with a sheet resistance of 10 Ω sq(-1) at a transmittance of 85% (λ = 550 nm), which is well described by the high ratio of DC to optical conductivity of 276 and percolation theory in a two-dimensional matrix model. This simple coating method enables the deposition of AgNW thin films with high optical transparency, flexibility, and stretchability directly on plastic substrates.
我们报道了一种有效的方法，用于在微升规模的溶液过程中，基于由剪切力驱动的银纳米线（AgNWs）的定向排列来制备高透明且可拉伸的大面积导电薄膜。通过拖动夹在两块板之间的微升涂层溶液滴，将具有平行AgNWs或AgNWs交叉结的薄导电膜沉积在涂层基板上。通过改变涂层过程中的简单系统参数，可以精细调节AgNW薄膜的光学和电学性质。具有AgNW交叉结的透明薄膜在85%（λ = 550 nm）的透光率下表现出优异的导电性，方阻为10 Ω sq(-1)，这在二维矩阵模型中由276的高直流电导率与光导率之比以及渗流理论很好地描述。这种简单的涂层方法能够直接在塑料基板上沉积具有高光学透明度、柔韧性和可拉伸性的AgNW薄膜。
