Graphene on Ru(0001) Moir茅 Corrugation Studied by Scanning Tunneling Microscopy on Au/Graphene/Ru(0001) Heterostructures

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• 作者：R. Cort茅s ; D. P. Acharya ; C. V. Ciobanu ; E. Sutter ; P. Sutter
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 10, 2013
• 年：2013
• 卷：117
• 期：40
• 页码：20675-20680
• 全文大小：276K
• 年卷期：v.117,no.40(October 10, 2013)
• ISSN：1932-7455

文摘

Two-dimensional Au islands of different thicknesses grown on graphene/Ru(0001) were used to study the corrugation of the moir茅 structure of graphene/Ru(0001) and discriminate between its mainly structural or electronic character. A comparison of the apparent corrugation measured by scanning tunneling microscopy (STM) for different Au thicknesses with results of elasticity theory equations applied to a gold film over a corrugated substrate shows that the corrugation observed for the graphene/Ru(0001) moir茅 is of structural nature rather than electronic. STM showed a large value for the corrugation of the first Au monolayer on graphene/Ru(0001), 1.7 脜; using density functional theory calculations, we explain this large corrugation of the Au monolayer as the result of a strong (weak) binding of the Au layer at the valley (hill) regions of the graphene/Ru(0001) moir茅 structure and infer an actual corrugation of the graphene/Ru(0001) moir茅 structure of 1.2 脜 from the measured corrugation of the Au monolayer.