Pastore Carbone Maria Giovanna, Manikas Anastasios C, Souli Ioanna, Pavlou Christos, Galiotis Costas
Institute of Chemical Engineering Sciences, Foundation of Research and Technology-Hellas (FORTH/ICE-HT), Stadiou Street, Platani, 26504, Patras, Greece.
Department of Chemical Engineering, University of Patras, 26504, Patras, Greece.
Nat Commun. 2019 Apr 5;10(1):1572. doi: 10.1038/s41467-019-09489-z.
Graphene is susceptible to morphological instabilities such as wrinkles and folds, which result from the imposition of thermo-mechanical stresses upon cooling from high temperatures and/ or under biaxial loading. A particular pattern encountered in CVD graphene is that of mosaic formation. Although it is understood that this pattern results from the severe biaxial compression upon cooling from high temperatures, it has not been possible to create such a complex pattern at room temperature by mechanical loading. Herein, we have managed by means of lateral wrinkling induced by tension and Euler buckling resulting from uniaxial compression upon unloading, to create such patterns in exfoliated graphene. We also show that these patterns can be used as channels for trapping or administering fluids at interstitial space between graphene and its support. This opens a whole dearth of new applications in the area of nano-fluidics but also in photo-electronics and sensor technologies.
石墨烯容易出现形态不稳定性，如褶皱，这是在从高温冷却和/或双轴加载下施加热机械应力所导致的。化学气相沉积（CVD）石墨烯中遇到的一种特殊图案是马赛克形成。虽然据了解这种图案是由从高温冷却时的严重双轴压缩导致的，但通过机械加载在室温下创造出这样复杂的图案是不可能的。在此，我们通过拉伸诱导的横向褶皱和卸载时单轴压缩产生的欧拉屈曲，成功在剥离的石墨烯中创造出了这种图案。我们还表明，这些图案可作为通道，用于在石墨烯与其支撑物之间的间隙空间捕获或输送流体。这不仅为纳米流体领域，也为光电子学和传感器技术开辟了一系列全新的应用。
