Microflow Manipulation by Velocity Field Gradient: Spontaneous Patterning of Silver Nanowires for Tailored Flexible Transparent Conductors
Microflow Manipulation by Velocity Field Gradient: Spontaneous Patterning of Silver Nanowires for Tailored Flexible Transparent Conductors
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DOI：
10.1002/admt.202101687
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发表时间：
2022-03-11
影响因子：
6.8
通讯作者：
Minari, Takeo
中科院分区：
文献类型：
--
作者：
Li, Lingying;Li, Wanli;Minari, Takeo
柔性透明导体（TC）因其优异的光学、电学和机械性能而成为新兴软光电子学的基本组件。这些特性归因于导电功能纳米材料，特别是一维无机纳米线的合理排列。尽管提出了各种图案化技术，但以简便、可扩展和通用的方式图案化具有令人满意的导电性和灵活性的高度透明导体仍然是一个悬而未决的问题。在这里，提出了一种定向自组装策略，利用微流速度场诱导的液-固界面对准，将银纳米线 (AgNW) 图案化为具有交联网络结构的柔性 TC。在双表面结构下，涂覆的AgNW悬浮液中周期性变化的内部微流有利于AgNW在指定区域上以逐层的方式自发排列，产生具有超高透光率（98.2%）、低薄层电阻（29.7 omega sq(-1)）和突出的机械变形能力的高度有序的AgNW TC。所提出的策略进一步应用于制造高精度任意AgNW电路，以实现具有可调节局部热源的柔性透明加热器。这是一种通用且可定制的方法，用于以简化的方式生产功能性纳米材料，几乎没有任何尺寸或形状限制，并为原型设计和制造高性能软光电子产品提供了极大的自由。
Flexible transparent conductors (TCs) are the fundamental components for emerging soft optoelectronics because of their excellent optical, electrical, and mechanical properties. These properties are attributed to reasonable alignment of conductive functional nanomaterials, especially 1D inorganic nanowires. Although various patterning technologies are proposed, patterning highly transparent conductors with satisfactory conductivity and flexibility in a facile, scalable, and versatile manner remains an open issue. Here, a directed self-assembly strategy is presented for patterning silver nanowires (AgNWs) into flexible TCs with a cross-linked network structure using microflow velocity-field-induced alignment at a liquid-solid interface. Under dual-surface architectonics, the periodically varying internal microflow in the overcoated AgNW suspension facilitates the spontaneous alignment of the AgNWs on the designated regions in a layer-by-layer manner, yielding highly ordered AgNW TCs with an ultrahigh transmittance (98.2%), low sheet resistance (29.7 omega sq(-1)), and prominent mechanical deformability. The proposed strategy is further applied to fabricate high-accuracy arbitrary AgNW circuits to realize flexible transparent heaters with adjustable localized heat sources. This is a universal and customizable method for producing functional nanomaterials with hardly any scale or shape limitations in a streamlined fashion and provides great freedom for prototyping and manufacturing high-performance soft optoelectronics.