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学科主题: 物理化学
题名: Growth and characterization of Au, Ni and Au-Ni nanoclusters on 6H-SiC(0001) carbon nanomesh
作者: Wang, Zhou-jun1;  Fu, Qiang1;  Wang, Zhen1;  Bao, Xinhe1
通讯作者: 傅强 ;  包信和
关键词: Gold ;  Nickel ;  Silicon carbide ;  Nucleation ;  Thermal stability ;  Bimetallic catalyst
刊名: SURFACE SCIENCE
发表日期: 2012-08-01
DOI: 10.1016/j.susc.2012.04.017
卷: 606, 期:15-16, 页:1313-1322
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 502
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Condensed Matter
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The nucleation and thermal stability of Au. Ni, and Au-Ni nanoclusters on 6H-SiC(0001) carbon nanomesh as well as the interaction between Au-Ni bimetallic clusters and reactive gases have been studied by X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). Both Au and Ni atoms grow as three-dimensional (3D) clusters. Annealing the Au/carbon nanomesh surface up to 1150 degrees C leads to complete desorption of the Au clusters, while interfacial reaction occurs between Ni clusters and the substrate surface when the Ni clusters are subjected to the same annealing process. The nucleation of Au-Ni clusters depends critically on the deposition sequence. Au atoms preferentially nucleate on the existing Ni clusters, leading to the formation of bimetallic clusters with Au enriched on the surface. If the deposition sequence is reversed, a part of Ni atoms nucleate between the Au clusters. The thermal stability of the Au-Ni clusters resembles that of the Ni/carbon nanomesh surface, irrespective of the deposition sequence. XPS characterization reveals that Ni atoms in Au-Ni bimetallic clusters are oxidized upon exposure to 5.0 x 10(-7) mbar O-2 for 5 min at room temperature while negligible structure change can be detected when the bimetallic clusters are exposed to CO gas under the similar conditions. (C) 2012 Elsevier B.V. All rights reserved.
关键词[WOS]: CO OXIDATION ;  SURFACE ALLOY ;  NANOPARTICLE CATALYSTS ;  BIMETALLIC CATALYSTS ;  CLUSTERS ;  ADSORPTION ;  REACTIVITY ;  AU(111) ;  SUPPORT ;  FILMS
语种: 英语
WOS记录号: WOS:000305845600033
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/117830
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

Recommended Citation:
Wang, Zhou-jun,Fu, Qiang,Wang, Zhen,et al. Growth and characterization of Au, Ni and Au-Ni nanoclusters on 6H-SiC(0001) carbon nanomesh[J]. SURFACE SCIENCE,2012,606(15-16):1313-1322.
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