Oxygen-induced migration of Ag nano-clusters on Si(111)-7 X 7 surface
Jiao, J; Pan, MH; Xue, QK; Bao, XH
KeywordScanning Tunneling Microscope Silica Silver Cluster Migration Adsorbed Oxygen
Indexed BySCI
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
AbstractThe 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.
WOS IDWOS:000184218500009
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
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GB/T 7714
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.
APA Jiao, J,Pan, MH,Xue, QK,&Bao, XH.(2003).Oxygen-induced migration of Ag nano-clusters on Si(111)-7 X 7 surface.CHINESE JOURNAL OF CATALYSIS,24(6),433-436.
MLA Jiao, J,et al."Oxygen-induced migration of Ag nano-clusters on Si(111)-7 X 7 surface".CHINESE JOURNAL OF CATALYSIS 24.6(2003):433-436.
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