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Effect of epitaxial graphene morphology on adsorption of ambient species

机译：外延石墨烯形态对周围物种吸附的影响

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This work illustrates the impact of atmospheric gases on the surface of epitaxial graphene. The different rate of adsorption on different parts of graphene samples provides a concrete evidence that the surface morphology of graphene plays a significant role in this process. The uneven adsorption occurs only on the surface of the monolayer graphene and not on bilayer graphene. The second monolayer is distinguished and verified by the phase contrast mode of atomic force microscopy and the low energy electron microscopy, respectively. Raman spectroscopy is used to study the strain on the surface of graphene; results indicate that monolayer and bilayer graphene exhibit different types of strain. The bilayer is under more compressive strain in comparison with monolayer graphene that hinders the process of adsorption. However, the wrinkles and edges of steps of the bilayer are under tensile strain, hence, facilitate adsorption. Samples were subjected to X-ray photoelectron spectroscopy which confirms that the adsorbates on the epitaxial graphene are carbon clusters with nitrogen and oxygen contamination. For reversing the adsorption process the samples are annealed and a method for the removal of these adsorbates is proposed.
机译：这项工作说明了大气气体对外延石墨烯表面的影响。石墨烯样品不同部分的不同吸附率提供了一种具体证据，即石墨烯的表面形态在该过程中起着重要作用。不均匀的吸附仅在单层石墨烯的表面上而不是在双层石墨烯上发生。通过原子力显微镜显微镜和低能量电子显微镜的相位对比模式分别和验证第二单层。拉曼光谱法用于研究石墨烯表面上的应变;结果表明单层和双层石墨烯表现出不同类型的菌株。与妨碍吸附过程的单层石墨烯相比，双层是更压缩的菌株。然而，双层的步骤的皱纹和边缘在拉伸菌株下，因此，促进吸附。对样品进行X射线光电子能力，证实外延石墨烯上的吸附物是具有氮和氧气污染的碳簇。为了逆转吸附过程，提出了样品，并提出了去除这些吸附物的方法。

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