Strain in epitaxial graphene visualized by intercalation.
Strain in epitaxial graphene visualized by intercalation.
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DOI：
10.1103/physrevlett.110.086111
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发表时间：
2013-02
影响因子：
8.6
通讯作者：
S. Schumacher;D. Förster;M. Rösner;T. Wehling;T. Michely
中科院分区：
文献类型：
--
作者：
S. Schumacher;D. Förster;M. Rösner;T. Wehling;T. Michely
Eu 在 Ir(111) 上石墨烯下的插层会产生沿石墨烯莫尔条纹定向的图案，并通过其单位网格量化尺寸。图案由条纹、紧凑的岛状和通道形成。在很宽的插层量范围内，图案的阶跃浓度具有相当恒定的饱和度值。这些发现可以通过石墨烯与基底的化学调节结合以及石墨烯由于生长温度的冷却而预先存在的应变来解释。插层台阶密度的局部变化似乎反映了预先存在的应变的局部变化。
Intercalation of Eu under graphene on Ir(111) results in patterns oriented along the graphene moiré and quantized in size by its unit mesh. The patterns are formed by stripes, compact islands, and channels. Over a wide range of intercalated amounts the step concentration of the pattern has a rather constant saturation value. These findings are explained by the chemically modulated binding of graphene to the substrate and the preexisting strain in graphene due to its cooldown from the growth temperature. Local variations in the intercalation step density appear to reflect local variations in the preexisting strain.