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Raman mapping of a single-layer to double-layer graphene transition

机译:单层到双层石墨烯跃迁的拉曼映射

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摘要

We report on confocal Raman spectroscopy on a few-layer graphene flake. Adjacent single- and double-layer graphene sections allow mapping the transition in vibrational and electronic properties to a second stacked graphene sheet and with it a weak interlayer coupling. Most prominently the width of the D' peak doubles upon going from a single to a double layer, which can be explained within the double-resonant Raman model. The intensities of the G and G' lines decrease at the crossover to a single layer. Contrary to the G' line the G peak position shifts to higher wave numbers, however, not uniformly over the entire section: its frequency fluctuates spatially. The Raman map of the D line intensity shows a non-zero contribution at the boundaries of the flake and the individual sections, which can be attributed either to defects and disorder or to the breakdown of translational symmetry, whereas within the flake no D line signal is detected.
机译:我们报道了在几层石墨烯薄片上的共聚焦拉曼光谱。相邻的单层和双层石墨烯部分可以将振动和电子特性的跃迁映射到第二个堆叠的石墨烯片,并具有弱的层间耦合。最重要的是,D'峰的宽度在从单层变为双层时会翻倍,这可以在双共振拉曼模型中解释。 G和G'线的强度在交叉到单层时降低。与G'线相反,G峰位置移至更高的波数,但是在整个截面上变化不均匀:其频率在空间上波动。 D线强度的拉曼图显示了薄片和各个部分的边界处的非零贡献,这可以归因于缺陷和无序或平移对称性的破坏,而在薄片内没有D线信号被检测到。

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