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首页> 外文期刊>Advanced Functional Materials >Wetting-Assisted Crack- and Wrinkle-Free Transfer of Wafer-Scale Graphene onto Arbitrary Substrates over a Wide Range of Surface Energies
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Wetting-Assisted Crack- and Wrinkle-Free Transfer of Wafer-Scale Graphene onto Arbitrary Substrates over a Wide Range of Surface Energies

机译：晶圆级石墨烯在各种表面能上的湿润辅助裂纹和无皱纹转移到任意衬底上

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摘要

The polymer-supported wet transfer of chemical vapor deposition-grown graphene provides high-quality large-area graphene on a target substrate. The transfer-induced defects that result from these processes, such as micrometer-scale folds and cracks, have been regarded as an inevitable problem. Here, the transfer processes are thoroughly examined stage-by-stage and it is found that lamination wrinkles, which cause defects in the graphene, are generated as a result of the high contact angles of the trapped transfer medium liquids. Systematic theoretical and experimental studies demonstrate that a liquid droplet with a low surface tension trapped between the polymer/graphene film and the substrate minimizes lamination wrinkles during the transfer process by completely wetting the target substrate, regardless of the surface energy. In connection with these results, a simple and broadly applicable transfer method is developed using an organic liquid with a low surface tension to uniformly transfer high-quality graphene onto arbitrary substrates, even onto superhydrophobic substrate. The graphene obtained using the proposed organic liquid transfer method displays better electrical and mechanical properties than the graphene transferred by the conventional method using water. This effective and practical transfer method provides an approach to obtaining high-quality graphene for use in graphene-based devices.
机译：聚合物支撑的化学气相沉积生长的石墨烯的湿转移在目标衬底上提供了高质量的大面积石墨烯。由这些过程引起的转移引起的缺陷，例如微米级的褶皱和裂纹，被认为是不可避免的问题。在此，对转移过程进行了逐步详细的检查，发现由于捕获的转移介质液体的高接触角而产生了导致石墨烯缺陷的层压皱纹。系统的理论和实验研究表明，在聚合物/石墨烯薄膜和基材之间捕获的具有低表面张力的液滴可通过完全润湿目标基材而将转移过程中的层压皱纹最小化，而与表面能无关。结合这些结果，使用具有低表面张力的有机液体开发了一种简单且可广泛应用的转移方法，以将高质量的石墨烯均匀地转移到任意基材上，甚至转移到超疏水性基材上。使用提出的有机液体转移方法获得的石墨烯比通过使用水的常规方法转移的石墨烯表现出更好的电学和机械性能。这种有效而实用的转移方法提供了一种获得用于基于石墨烯的设备的高质量石墨烯的方法。

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