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题名: Oxygen-induced migration of Ag nano-clusters on Si(111)-7 X 7 surface
作者: Jiao, J;  Pan, MH;  Xue, QK;  Bao, XH
关键词: scanning tunneling microscope ;  silica ;  silver cluster ;  migration ;  adsorbed oxygen
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2003-06-01
卷: 24, 期:6, 页:433-436
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The oxygen-induced migration of Ag clusters on Si (111)-7 x 7 surface was observed by in-situ STM. All experiments were carried out in UHV system. The Si (111)-7 x 7 surface was obtained by directly heating to 1200 degreesC for several times. At the beginning of Ag clusters growth on the Si (111)-7 x 7 surface, Ag clusters formed the uniform and well-ordered arrays on the surface. The monomers, dimers and clusters of Ag were observed. After exposure to oxygen, some Ag clusters vanished and conglomerated into bigger clusters. As known, there are two kinds of adsorbed oxygen species on the Si surface, ad-ins and ins-ins. The Ag clusters appear to move easily on the surface until being trapped by adsorbed atomic oxygen and pinned around the adsorbed oxygen. It was confirmed that the migration of Ag clusters is caused by oxygen decoration. The statistical results show that the Ag clusters diffuse much easily on partly oxidized Si (111)-7 x 7 surface than on Si (111)-7 x 7 surface. It was also found that the strong interaction between Ag cluster and adsorbed oxygen species causes a distinct change of the property of adsorbed oxygen, i.e. a change of surface ins-ins oxygen into ad-ins oxygen species, reflecting the role of substrate at room temperature.
关键词[WOS]: STM ;  ADSORPTION ;  OXIDATION ;  SILVER
语种: 英语
WOS记录号: WOS:000184218500009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138218
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.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Inst Phys, State Key Lab Surface Phys, Beijing 100080, Peoples R China

Recommended Citation:
Jiao, J,Pan, MH,Xue, QK,et al. Oxygen-induced migration of Ag nano-clusters on Si(111)-7 X 7 surface[J]. CHINESE JOURNAL OF CATALYSIS,2003,24(6):433-436.
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