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Screen printing of silver nanowires: balancing conductivity with transparency while maintaining flexibility and stretchability
npj Flexible Electronics ( IF 12.3 ) Pub Date : 2019-07-10 , DOI: 10.1038/s41528-019-0057-1
Weiwei Li , Shuai Yang , Atif Shamim

Printing metal nanowires are particularly attractive as compared to conventional coating methods due to the ease of processing, direct patterning, and large-scale fabrication capability. However, it is still challenging to print metal nanowire patterns that simultaneously have high conductivity, high transparency, flexibility, and stretchability. Three steps have been taken in this work to balance the transparency and conductivity of the screen-printed flexible and stretchable silver nanowire films, (1) selection of the ink formulation, (2) optimization of the printing parameters, and (3) posttreatment with a laser. The as-obtained silver nanowire patterns are large-area and demonstrate an ultralow sheet resistance of 1.9 ohm/sq, high transmittance (73%) at the wavelength of 550 nm, and an ultrahigh figure of merit (~136) as compared to the printed silver nanowire electrodes in the literature. The screen-printed transparent patterns exhibit excellent electrical stability and mechanical repeatability when subjected to 1000 bending cycles with a bending radius of 28 mm and 1000 stretch-release cycles with 10% strain, which makes the transparent patterns suitable for the fabrication of flexible, transparent microwave absorbers. The absorption performance of the prepared frequency selective surface absorbers indicates no obvious degradation after various manipulating configurations and multiple bending and stretching cycles. The results are promising enough to make this ink and screen-printing process suitable for many applications of flexible, stretchable, and transparent electronics.



中文翻译:

银纳米线的丝网印刷:兼顾导电性和透明性,同时保持柔韧性和可拉伸性

与常规涂覆方法相比,由于易于加工,直接构图和大规模制造能力,印刷金属纳米线特别有吸引力。然而,印刷同时具有高导电性,高透明性,柔韧性和可拉伸性的金属纳米线图案仍然具有挑战性。在这项工作中已采取三个步骤来平衡丝网印刷的柔性和可拉伸银纳米线薄膜的透明性和导电性,(1)油墨配方的选择,(2)印刷参数的优化,以及(3)后处理雷射。所获得的银纳米线图案面积大,在550 nm的波长下显示出1.9 ohm / sq的超低薄层电阻,高透射率(73%),与文献中的印刷银纳米线电极相比,具有超高的品质因数(〜136)。当经受1000次弯曲半径为28 mm的弯曲循环和1000次具有10%应变的拉伸释放循环时,丝网印刷的透明图案具有出色的电稳定性和机械重复性,这使得该透明图案适合于制造柔性,透明的微波吸收剂。所制备的频率选择表面吸收剂的吸收性能表明,在各种操纵配置以及多次弯曲和拉伸循环后,吸收剂的吸收性能没有明显降低。结果令人鼓舞,足以使这种油墨和丝网印刷工艺适合于柔性,可拉伸和透明电子产品的许多应用。

更新日期:2019-07-10
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