Title: Wrinkling and crumpling in twisted few and multilayer CVD graphene: High density of edge modes influencing Raman spectra Show Chinese title

Title: 扭曲的少层和多层CVD石墨烯中的褶皱和皱折：边缘模式的高密度影响拉曼光谱

Abstract: Richness and complexity of Raman spectra related to graphene materials is established from years to decades, with, among others: the well-known G, D, 2D,... bands plus a plethora of weaker bands related to disorder behavior, doping, stress, crystal orientation or stacking information. Herein, we report on how to detect crumpling effects in Raman spectra, using a large variety of few and multilayer graphene. The main finding is that these crumples enhance the G band intensity like it does with twisted bi layer graphene. We updated the D over G band intensity ratio versus G band width plot, which is generally used to disentangle point and linear defects origin, by reporting surface defects created by crumples. Moreover, we report for the first time on the existence 23 resonant additional bands at 633 nm. We attribute them to edge modes formed by high density of crumples. We use Raman plots (2D bands versus G band positions and widths) to gain qualitative information about the way layers are stacked. Show Chinese abstract

Abstract: 拉曼光谱的丰富性和复杂性与石墨烯材料相关，已有数十年的研究，其中包括：众所周知的G带、D带、2D带等，以及大量较弱的带，这些带与无序行为、掺杂、应力、晶体取向或堆叠信息有关。在此，我们报告了如何利用多种少层和多层石墨烯检测拉曼光谱中的褶皱效应。主要发现是，这些褶皱增强了G带强度，就像扭曲的双层石墨烯所做的那样。我们更新了D带与G带强度比值与G带宽度的图表，该图表通常用于区分点缺陷和线缺陷的来源，并报告了由褶皱产生的表面缺陷。此外，我们首次报告了在633纳米处存在23个共振附加带。我们将它们归因于高密度褶皱形成的边缘模式。我们使用拉曼图（2D带与G带位置和宽度）来获得关于层堆叠方式的定性信息。