Department of Chemical Engineering , National Taiwan University , Taipei 10617 , Taiwan.
Advanced Research Center of Green Materials Science & Technology, Taipei 10617 , Taiwan.
ACS Appl Mater Interfaces. 2018 Jul 18;10(28):24217-24223. doi: 10.1021/acsami.8b08310. Epub 2018 Jul 6.
In this study, a composite material with healable and foldable features is formulated to print conductive patterns on rough surfaces, such as paper, cloth, and three-dimensional (3D) printed objects. Carbon nanotubes (CNTs) are mixed with wax to formulate a solid composite for pen writing. The composite has a low percolation threshold of 2.5 wt % CNTs and can be written on various rough substrates, such as paper and cloth, to create conductive patterns for electronic conductors. Because of the strong infrared (IR) absorption of CNTs, the printed patterns can be selectively sintered by noncontact IR radiation efficiently to show great electrical conductivity. The electrical resistance of the written patterns on paper also show an insignificant increase after bending, folding, and crumpling. Furthermore, the conductive composite exhibits great healability after destructive damages. The conductivity of the damaged patterns after severe folding or knife cutting recovers to its original value with thermal or IR heating. Several examples, such as conductive tracks on paper, cloth, or 3D printed objects, are also demonstrated to show the potential of this healable conductive composite for electronic applications.
在这项研究中，我们制备了一种具有可修复和可折叠特性的复合材料，可以在粗糙表面（如纸张、布料和三维（3D）打印物体）上打印导电图案。我们将碳纳米管（CNTs）与蜡混合，制成用于笔写的固体复合材料。该复合材料的渗流阈值低至 2.5wt%的 CNT，可在各种粗糙基底（如纸张和布料）上书写，以制造用于电子导体的导电图案。由于 CNT 具有很强的红外（IR）吸收能力，因此可以通过非接触式 IR 辐射有效地选择性烧结打印图案，从而表现出优异的导电性。在纸张上书写的图案的电阻在弯曲、折叠和起皱后也没有明显增加。此外，该导电复合材料在受到破坏后具有很好的修复能力。经过严重折叠或刀割等破坏后，图案的导电性可以通过热或 IR 加热恢复到原始值。我们还展示了几个示例，例如纸张、布料或 3D 打印物体上的导电轨道，以展示这种可修复导电复合材料在电子应用方面的潜力。
