Mosaic pattern formation in exfoliated graphene by mechanical deformation
Mosaic pattern formation in exfoliated graphene by mechanical deformation
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DOI：
10.1038/s41467-019-09489-z
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发表时间：
2019-04-05
影响因子：
16.6
通讯作者：
Galiotis, Costas
中科院分区：
文献类型：
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作者：
Carbone, Maria Giovanna Pastore;Manikas, Anastasios C.;Galiotis, Costas
石墨烯易受形态不稳定性如褶皱和折叠的影响，这是由于在从高温冷却时和/或在双轴负载下施加热机械应力造成的。CVD石墨烯中遇到的一种特殊模式是马赛克形成。尽管可以理解，这种图案是由高温冷却时的严重双轴压缩产生的，但在室温下通过机械加载不可能产生这种复杂的图案。在本文中，我们已经通过由张力引起的横向扭曲和由卸载时的单轴压缩引起的欧拉屈曲来管理，以在剥离的石墨烯中产生这样的图案。我们还表明，这些图案可以用作通道，用于捕获或管理石墨烯及其支持之间的间隙空间的流体。这在纳米流体领域以及光电子和传感器技术领域开辟了全新的应用领域。
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.