Kang Junmo, Jang Yonghee, Kim Youngsoo, Cho Seung-Hyun, Suhr Jonghwan, Hong Byung Hee, Choi Jae-Boong, Byun Doyoung
SKKU Advanced Institute of Nanotechnology (SAINT) and Center for Human Interface Nano Technology (HINT), Sungkyunkwan University, Suwon 440-746, Korea.
Nanoscale. 2015 Apr 21;7(15):6567-73. doi: 10.1039/c4nr06984f.
Recently, carbon materials such as carbon nanotubes and graphene have been proposed as alternatives to indium tin oxide (ITO) for fabricating transparent conducting materials. However, obtaining low sheet resistance and high transmittance of these carbon materials has been challenging due to the intrinsic properties of the materials. In this paper, we introduce highly transparent and flexible conductive films based on a hybrid structure of graphene and an Ag-grid. Electrohydrodynamic (EHD) jet printing was used to produce a micro-scale grid consisting of Ag lines less than 10 μm wide. We were able to directly write the Ag-grid on a large-area graphene/flexible substrate due to the high conductivity of graphene. The hybrid electrode could be fabricated using hot pressing transfer and EHD jet printing in a non-vacuum, maskless, and low-temperature environment. The hybrid electrode offers an effective and simple route for achieving a sheet resistance as low as ∼4 Ω per square with ∼78% optical transmittance. Finally, we demonstrate that transparent flexible heaters based on the hybrid conductive films could be used in a vehicle or a smart window system.
最近，碳纳米管和石墨烯等碳材料已被提议作为制造透明导电材料时铟锡氧化物（ITO）的替代品。然而，由于这些碳材料的固有特性，要获得低表面电阻和高透光率一直具有挑战性。在本文中，我们介绍了基于石墨烯和银网格混合结构的高透明且柔性的导电薄膜。采用电液动力（EHD）喷射印刷来制作由宽度小于10μm的银线组成的微尺度网格。由于石墨烯具有高导电性，我们能够直接在大面积的石墨烯/柔性基板上写入银网格。这种混合电极可以在非真空、无掩膜和低温环境下通过热压转移和EHD喷射印刷来制造。该混合电极提供了一条有效且简单的途径，可实现低至约每平方4Ω的表面电阻和约78%的光学透过率。最后，我们证明基于这种混合导电薄膜的透明柔性加热器可用于车辆或智能窗系统。
