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arXiv 1707.09698cond-mat.mtrl-scicond-mat.mes-hallphysics.chem-phphysics.comp-ph
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制备和1.5年后的铜/石墨烯界面的原子和电子结构

Atomic and electronic structure of a copper/graphene interface as prepared and 1.5 years after

D. W. Boukhvalov, P. F. Bazylewski, A. I. Kukharenko, I. S. Zhidkov, Yu. S. Ponosov, E. Z. Kurmaev, S. O. Cholakh, Y. H. Lee, G. S. Chang

摘要:

我们报告了在不同条件(环境和低湿度)下1.5年后在高质量铜表面和相同材料上制备的石墨烯的X射线光谱和拉曼测量结果。将所得结果与密度泛函理论计算的石墨烯/Cu界面中各种结构缺陷的形成能和电子结构进行了比较。为了评价碳覆盖的稳定性,我们提出了一个两步模型。第一步是石墨烯的氧化,第二步是石墨烯的穿孔,去除作为二氧化碳分子一部分的碳原子。建模和实验测量的结果提供了证据,证明在高质量铜衬底上生长的石墨烯随着时间的推移(1.5年)变得坚固和稳定。然而,该界面的稳定性取决于石墨烯的质量以及石墨烯和衬底中的原生缺陷的数量。还讨论了金属衬底上的缺陷对石墨烯的稳定性和电子结构的影响。

英文摘要:

We report the results of X-ray spectroscopy and Raman measurements of as-prepared graphene on a high quality copper surface and the same materials after 1.5 years under different conditions (ambient and low humidity). The obtained results were compared with density functional theory calculations of the formation energies and electronic structures of various structural defects in graphene/Cu interfaces. For evaluation of the stability of the carbon cover, we propose a two-step model. The first step is oxidation of the graphene, and the second is perforation of graphene with the removal of carbon atoms as part of the carbon dioxide molecule. Results of the modeling and experimental measurements provide evidence that graphene grown on high-quality copper substrate becomes robust and stable in time (1.5 years). However, the stability of this interface depends on the quality of the graphene and the number of native defects in the graphene and substrate. The effect of the presence of a metallic substrate with defects on the stability and electronic structure of graphene is also discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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