Twist-Dependent Raman and Electron Diffraction Correlations in Twisted Multilayer Graphene,The Journal of Physical Chemistry Letters

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Twist-Dependent Raman and Electron Diffraction Correlations in Twisted Multilayer Graphene
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-03-19 , DOI: 10.1021/acs.jpclett.0c00582
Nikita Gupta ₁ , Sunil Walia _{2,

3} , Umesha Mogera ₁ , Giridhar U. Kulkarni ₁

Affiliation

Twisted multilayer graphene (tMLG), in contrast to twisted bilayer graphene, offers a range of angular rotations for tuning the properties of the system. In this work, a turbostratic graphene system with a high degree of two-dimensional (2D) crystallinity is chosen to represent tMLG. We have investigated the distribution and population of twist angles from distributed sextets in electron diffraction (SAED) patterns with the collective Raman behavior at the same locations. A descriptor, termed the turbostratic factor, was calculated on the basis of angular spacings in SAEDs, to account for their distribution; the greater the spread, the higher the turbostratic factor. Raman spectra have revealed that the turbostratic factor remains low (∼0°) for a graphitic region with a low 2D to G intensity ratio (I_2D/I_G) and increases rapidly at higher I_2D/I_G values, saturating at 60° for highly turbostratic systems. Relating the intensities associated with the sextets and I_2D/I_G values, we found the maximum achievable value of I_2D/I_G to be 17.92.

中文翻译：

扭曲多层石墨烯中依赖于扭曲的拉曼和电子衍射相关性

与扭曲的双层石墨烯相比，扭曲的多层石墨烯（tMLG）提供了一系列角度旋转，以调节系统的性能。在这项工作中，选择具有高度二维（2D）结晶度的涡轮层石墨烯系统代表tMLG。我们已经研究了在相同位置具有集体拉曼行为的电子衍射（SAED）模式中分布六边形的扭曲角的分布和总体。根据SAED中的角间距计算了一个描述为涡轮层因子的描述符，以说明它们的分布。扩散越大，涡轮层系数越高。拉曼光谱显示，对于2D与G强度比低的石墨区域，涡轮地层因子保持较低（〜0°）（I _2D/ I _G），并在较高的I _2D / I _G值下迅速增加，对于高度涡轮层系统，饱和度为60°。关于与sextets和相关联的强度我_2D /我_ģ值，我们发现的最大可达到的值我_2D /我_ģ为17.92。

更新日期：2020-04-24

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