Growth Mechanism of Graphene on Ru(0001) and O2 Adsorption on the Graphene/Ru(0001) Surface

被引：159
|
作者：
Zhang, Hui [1 ]
Fu, Qiang [1 ]
Cui, Yi [1 ]
Tan, Dali [1 ]
Bao, Xinhe [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 19期
基金：
中国国家自然科学基金;
关键词：
ENERGY-LOSS SPECTROSCOPY; SCANNING-TUNNELING-MICROSCOPY; ANGLE-RESOLVED PHOTOEMISSION; CARBON NANOTUBES; OXIDATIVE DEHYDROGENATION; GRAPHITE MONOLAYER; OXYGEN-ADSORPTION; THERMAL EVOLUTION; SUPPORTED SILVER; PT(111) SURFACE;
D O I：
10.1021/jp810514u
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 growth mechanism of monolayer (ML) graphene on Ru(0001) via pyrolysis of C2H4 was studied by scanning tunneling microscopy (STM), high-resolution electron energy loss spectroscopy (HREELS), and ultraviolet photoelectron spectroscopy (UPS). On the basis of the mechanistic understanding, graphene overlayers ranging from nanographene clusters to graphene film with 1 ML coverage were prepared in a well-controlled way. O-2 adsorption on the graphene/Ru(0001) surface was investigated by STM, UPS, and X-ray photoelectron spectroscopy (XPS). It is revealed that the Ru(0001) surface fully covered by graphene becomes passivated to O-2 adsorption at room temperature and only activated again at elevated temperatures (>500 K). The adsorbed oxygen intercalates between the topmost graphene overlayer and the Ru(0001) substrate surface. These intercalated oxygen atoms decouple the graphene layer from the Ru(0001) substrate, forming quasi-freestanding monolayer graphene atomic crystals floating on the O-Ru(0001) surface.
引用
收藏
页码：8296 / 8301
页数：6
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