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

被引：11
作者：
Cortes, R. [1 ]
Acharya, D. P. [1 ]
Ciobanu, C. V. [2 ,3 ]
Sutter, E. [1 ]
Sutter, P. [1 ]
机构：
[1] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA
[2] Colorado Sch Mines, Dept Mech Engn, Golden, CO 80401 USA
[3] Colorado Sch Mines, Mat Sci Program, Golden, CO 80401 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 40期
基金：
美国国家科学基金会;
关键词：
TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; EPITAXIAL GRAPHENE; LARGE-AREA; DEPOSITION; SURFACES; GROWTH; METALS; STATE; FILMS;
D O I：
10.1021/jp406415h
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Two-dimensional Au islands of different thicknesses grown on graphene/Ru(0001) were used to study the corrugation of the moire 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) moire is of structural nature rather than electronic. STM showed a large value for the corrugation of the first Au monolayer on graphene/Ru(0001), similar to 1.7 angstrom; 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) moire structure and infer an actual corrugation of the graphene/Ru(0001) moire structure of similar to 1.2 angstrom from the measured corrugation of the Au monolayer.
引用
收藏
页码：20675 / 20680
页数：6
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