Uniform, Highly Conductive, and Patterned Transparent Films of a Percolating Silver Nanowire Network on Rigid and Flexible Substrates Using a Dry Transfer Technique
Uniform, Highly Conductive, and Patterned Transparent Films of a Percolating Silver Nanowire Network on Rigid and Flexible Substrates Using a Dry Transfer Technique
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DOI：
10.1007/s12274-010-0017-5
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发表时间：
2010-08-01
期刊：
影响因子：
9.9
通讯作者：
Zhou, Chongwu
中科院分区：
文献类型：
--
作者：
Madaria, Anuj R.;Kumar, Akshay;Zhou, Chongwu
银纳米线薄膜是取代锡掺杂氧化铟（ITO）薄膜作为透明导电电极的有希望的替代物。本文报道了利用真空过滤和聚二甲基硅氧烷（PDMS）辅助转移印刷技术在刚性和柔性基底上制备银纳米线薄膜的方法，该方法具有图案化转移能力强、性能优于各种ITO替代品等优点（在85%透明度下为10 Ω/sq），并且对下面的基底具有良好的粘附性，从而消除了先前报道的粘附问题。此外，我们的方法还允许在几分钟内制备具有不同线宽和形状的银纳米线的高质量图案化膜，使其成为可扩展的过程。此外，在转移过程中使用阳极氧化铝（AAO）膜允许在适度高温下退火纳米线膜以获得具有极高导电性和良好透明度的膜。使用这种转移技术，我们获得了银纳米线薄膜上的柔性聚对苯二甲酸乙二醇酯（PET）基板的透明度为85%，方块电阻为10 Ω/平方，具有良好的机械灵活性。详细的分析表明，银纳米线网络表现出二维渗流行为与实验观察到的临界体积和理论预测值之间的良好协议。
Silver nanowire films are promising alternatives to tin-doped indium oxide (ITO) films as transparent conductive electrodes. In this paper, we report the use of vacuum filtration and a polydimethylsiloxane (PDMS)-assisted transfer printing technique to fabricate silver nanowire films on both rigid and flexible substrates, bringing advantages such as the capability of patterned transfer, the best performance among various ITO alternatives (10 Omega/sq at 85% transparency), and good adhesion to the underlying substrate, thus eliminating the previously reported adhesion problem. In addition, our method also allows the preparation of high quality patterned films of silver nanowires with different line widths and shapes in a matter of few minutes, making it a scalable process. Furthermore, use of an anodized aluminum oxide (AAO) membrane in the transfer process allows annealing of nanowire films at moderately high temperature to obtain films with extremely high conductivity and good transparency. Using this transfer technique, we obtained silver nanowire films on a flexible polyethylene terephthalate (PET) substrate with a transparency of 85%, a sheet resistance of 10 Omega/sq, with good mechanical flexibility. Detailed analysis revealed that the Ag nanowire network exhibits two-dimensional percolation behavior with good agreement between experimentally observed and theoretically predicted values of critical volume.