School of Materials Science and Engineering , Gwangju Institute of Science and Technology (GIST) , 261 Cheomdan-gwagiro (Oryong-Dong) , Buk-Gu, Gwangju 61005 , Republic of Korea.
Center for Convergent Research of Emerging Virus Infection , Korea Research Institute of Chemical Technology (KRICT) , 141 Gajeong-ro , Yuseong-gu , Daejeon 34114 , Republic of Korea.
ACS Nano. 2020 Jan 28;14(1):118-128. doi: 10.1021/acsnano.9b02141. Epub 2019 Sep 2.
The recent technology of transfer printing using various membrane-type flexible/stretchable electronic devices can provide electronic functions to desirable objects where direct device fabrication is difficult. However, if the target surfaces are rough and complex, the capability of accommodating surface mismatches for reliable interfacial adhesion remains a challenge. Here, we demonstrate that newly designed nanotubular cilia (NTCs), vertically aligned underneath a polyimide substrate, significantly enhance interfacial adhesion. The tubular structure easily undergoes flattening and wrapping motions to provide a large conformal contact area, and the synergetic effect of the assembled cilia strengthens the overall adhesion. Furthermore, the hierarchical structure consisting of radially spread film-type cilia combined with vertically aligned NTCs in specific regions enables successful transfer printing onto very challenging surfaces such as stone, bark, and textiles. Finally, we successfully transferred a temperature sensor onto an eggshell and indium gallium zinc oxide-based transistors onto a stone with no electrical failure.
最近的各种膜型柔性/可拉伸电子器件的转移印刷技术，可以为直接器件制造困难的理想物体提供电子功能。然而，如果目标表面粗糙且复杂，则适应表面不匹配以实现可靠界面粘附的能力仍然是一个挑战。在这里，我们证明了新设计的纳米管状纤毛（NTC），在聚酰亚胺基底下垂直排列，显著增强了界面粘附力。管状结构很容易发生扁平化和包裹运动，以提供较大的共形接触面积，并且组装的纤毛的协同效应增强了整体粘附力。此外，由径向展开的薄膜型纤毛和特定区域内的垂直排列的 NTC 组成的分层结构，使得可以成功地将印刷品转移到非常具有挑战性的表面上，如石头、树皮和纺织品。最后，我们成功地将温度传感器转移到蛋壳上，并将基于铟镓锌氧化物的晶体管转移到石头上，而没有出现电气故障。
