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题名: Intercalation-etching of graphene on Pt(111) in H-2 and O-2 observed by in-situ low energy electron microscopy
作者: Wei, Wei1, 2;  Meng, Caixia2;  Fu, Qiang2;  Bao, Xinhe2
关键词: graphene ;  etching ;  intercalation ;  LEEM ;  oxidation ;  hydrogenation
刊名: SCIENCE CHINA-CHEMISTRY
发表日期: 2017-05-01
DOI: 10.1007/s11426-017-9020-2
卷: 60, 期:5, 页:656-662
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Graphene layers are often exposed to gaseous environments in their synthesis and application processes, and interactions of graphene surfaces with molecules particularly H-2 and O-2 are of great importance in their physico-chemical properties. In this work, etching of graphene overlayers on Pt(111) in H-2 and O-2 atmospheres were investigated by in-situ low energy electron microscopy. Significant graphene etching was observed in 10(-5) Torr H-2 above 1023 K, which occurs simultaneously at graphene island edges and interiors with a determined reaction barrier at 5.7 eV. The similar etching phenomena were found in 10(-7) Torr O-2 above 973 K, while only island edges were reacted between 823 and 923 K. We suggest that etching of graphene edges is facilitated by Pt-aided hydrogenation or oxidation of edge carbon atoms while intercalation-etching is attributed to etching at the interiors at high temperatures. The different findings with etching in O-2 and H-2 depend on competitive adsorption, desorption, and diffusion processes of O and H atoms on Pt surface, as well as intercalation at the graphene/Pt interface.
关键词[WOS]: CHEMICAL-VAPOR-DEPOSITION ;  SINGLE-CRYSTAL GRAPHENE ;  HEXAGONAL BORON-NITRIDE ;  HYDROGEN INTERCALATION ;  OXYGEN INTERCALATION ;  DOPED GRAPHENE ;  GROWN GRAPHENE ;  GRAPHITE ;  COPPER ;  OXIDATION
语种: 英语
WOS记录号: WOS:000400771800012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/151987
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, iChEM, Dalian 116023, Peoples R China

Recommended Citation:
Wei, Wei,Meng, Caixia,Fu, Qiang,et al. Intercalation-etching of graphene on Pt(111) in H-2 and O-2 observed by in-situ low energy electron microscopy[J]. SCIENCE CHINA-CHEMISTRY,2017,60(5):656-662.
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