Breakdown of the Graphene Coating Effect under Sequential Exposure to O2 and H2S

被引:14
|
作者
Nilsson, Louis
Andersen, Mie
Hammer, Bjork
Stensgaard, Ivan
Hornekaer, Liv [1 ]
机构
[1] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
来源
基金
欧洲研究理事会;
关键词
EPITAXIAL GRAPHENE; OXYGEN; ADSORPTION; PLATINUM; KINETICS; IR(111); SULFUR; LAYER; STM;
D O I
10.1021/jz402054e
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
The coating effect of a graphene layer on the reconstructed Pt(100) surface toward reactive gases is investigated by a combination of scanning tunneling microscopy experiments and density functional theory calculations. We observe that while the graphene coating is effective toward individual exposures of O-2 and H2S, a sequential dose of O-2 and H2S causes a breakdown of the coating effect. From density functional theory calculations we explain these observations at the atomic level. We show that it is favorable for oxygen atoms to disrupt the Pt-C bonds at the graphene edge to insert between the edge and the surface in a bridging position. This closed-edge configuration explains why oxygen alone is not found to intercalate under the graphene at room temperature. With the subsequent dosing of H2S, we propose that the oxygen atoms are released from the platinum surface causing the breakdown of the coating effect.
引用
收藏
页码:3770 / 3774
页数:5
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