Corrugation in Exfoliated Graphene: An Electron Microscopy and Diffraction Study

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• 作者：Andrea Locatelli ; Kevin R. Knox ; Dean Cvetko ; Tevfik Onur Menteş ; Miguel Angel Niño ; Shancai Wang ; Mehmet B. Yilmaz ; Philip Kim ; Richard M. Osgood Jr. ; Alberto Morgante
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：August 24, 2010
• 年：2010
• 卷：4
• 期：8
• 页码：4879-4889
• 全文大小：517K
• 年卷期：0
• ISSN：1936-086X

文摘

Low-energy electron microscopy and microprobe diffraction are used to image and characterize corrugation in SiO₂-supported and suspended exfoliated graphene at nanometer length scales. Diffraction line-shape analysis reveals quantitative differences in surface roughness on length scales below 20 nm which depend on film thickness and interaction with the substrate. Corrugation decreases with increasing film thickness, reflecting the increased stiffness of multilayer films. Specifically, single-layer graphene shows a markedly larger short-range roughness than multilayer graphene. Due to the absence of interactions with the substrate, suspended graphene displays a smoother morphology and texture than supported graphene. A specific feature of suspended single-layer films is the dependence of corrugation on both adsorbate load and temperature, which is manifested by variations in the diffraction line shape. The effects of both intrinsic and extrinsic corrugation factors are discussed.