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Periodic ripples on thermally-annealed graphene on Cu (110)-reconstruction or moire pattern?

机译:在Cu(110)的热退火石墨烯上的周期性涟漪 - 重新构建或莫尔模式?

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We have used ultrahigh vacuum scanning tunneling microscopy (STM) to investigate the effect of thermal annealing of graphene grown by chemical vapor deposition on a Cu(110) foil. We show that the annealing appears to induce a reconstruction of the Cu surface along the [210] direction, with a period of 1.43 nm. Such reconstructions have been ascribed to the tensile strain induced in the Cu surface by its differential thermal expansion relative to the graphene overlayer, but we show that it is in fact a moire pattern due to interference between the graphene and the underlying atomic lattice as evidenced by the appearance of an odd-even transition only observed due to misorientation of the top layer of a layered crystal. This highlights that the analysis of STM measurements of graphene on metal surfaces should take such interference effects into account and that the graphene-Cu interface is more complex than previously thought.
机译:我们使用了超高真空扫描隧道显微镜(STM)来研究石墨烯的热退火通过化学气相沉积在Cu(110)箔上的影响。 我们表明,退火似乎沿[210]方向诱导Cu表面的重建,为1.43nm的时期。 这种重建已经通过其相对于石墨烯覆盖器的差动热膨胀来归因于Cu表面中诱导的拉伸菌株,但是我们表明由于石墨烯和下面的原子晶格之间的干涉而导致的莫尔图案如图所示 由于层状晶体的顶层的错误化,仅观察到奇数过渡的外观。 这突出显示金属表面上石墨烯STM测量的分析应该考虑这种干扰效应,并且石墨烯-CU接口比以前认为更复杂。

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