Graphene on Ru(0001):: A 25x25 supercell

被引：254
|
作者：
Martoccia, D. [1 ]
Willmott, P. R. [1 ]
Brugger, T. [2 ]
Bjoerck, M. [1 ]
Guenther, S. [3 ]
Schlepuetz, C. M. [1 ]
Cervellino, A. [1 ]
Pauli, S. A. [1 ]
Patterson, B. D. [1 ]
Marchini, S. [3 ]
Wintterlin, J. [3 ]
Moritz, W. [4 ]
Greber, T. [2 ]
机构：
[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland
[2] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland
[3] Univ Munich, Dept Chem, D-81377 Munich, Germany
[4] Univ Munich, Dept Crystallog, D-81377 Munich, Germany
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 12期
关键词：
D O I：
10.1103/PhysRevLett.101.126102
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The structure of a single layer of graphene on Ru(0001) has been studied using surface x-ray diffraction. A surprising superstructure containing 1250 carbon atoms has been determined, whereby 25x25 graphene unit cells lie on 23x23 unit cells of Ru. Each supercell contains 2x2 crystallographically inequivalent subcells caused by corrugation. Strong intensity oscillations in the superstructure rods demonstrate that the Ru substrate is also significantly corrugated down to several monolayers and that the bonding between graphene and Ru is strong and cannot be caused by van der Waals bonds. Charge transfer from the Ru substrate to the graphene expands and weakens the C-C bonds, which helps accommodate the in-plane tensile stress. The elucidation of this superstructure provides important information in the potential application of graphene as a template for nanocluster arrays.
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页数：4
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