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题名: Enhanced methanol dissociation on nanostructured 2D Al overlayers
作者: Zhang, Zhen;  Fu, Qiang;  Zhang, Hui;  Li, Yong;  Yao, Yunxi;  Tan, Dali;  Bao, Xinhe
通讯作者: 傅强 ;  包信和
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2007-09-13
DOI: 10.1021/jp073607b
卷: 111, 期:36, 页:13524-13530
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 ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Three well-defined two-dimensional (21)) Al overlayers including the Al/Si(111) alpha-phase with Al coverage of similar to 0.25 ML, the Al/Si(111) gamma-phase with Al coverage of similar to 0.8 ML, and the bulk Al film with Al coverage of 16 ML on Si(I 11) have been prepared using the molecular beam epitaxy technique. Their surface morphology and electronic structure were characterized by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy (UPS). The 16 ML Al film presents the metallic Al character, while the nanostructured Al/Si(111) alpha-phase and gamma-phase are semiconducting due to space confinement of the surface Al atoms. The interfacial Al-Si interaction results in electron deficiency in surface Al atoms which follows the order of Al/Si(l 11) alpha-phase > Al/Si(111) gamma-phase > bulk Al film. Methanol dissociation reactions on the Al surfaces at room temperature were studied by XPS and high-resolution electron energy loss spectroscopy (HREELS). The Al/Si(111) alpha-phase presents the highest activity for the dissociation of CH3OH and CH3Oads and the lowest activity for the bulk Al film. The exceptional activity of the nanostructured 2D Al surfaces for O-H and C-O bond scission has been attributed to their unique geometric structures as well as their semiconducting and electron-deficient characters.
关键词[WOS]: C-O BOND ;  SCANNING-TUNNELING-MICROSCOPY ;  ELECTRONIC-STRUCTURE ;  LOW-TEMPERATURE ;  MODEL CATALYSTS ;  SI(111) SURFACE ;  PD(111) SURFACE ;  DECOMPOSITION ;  ADSORPTION ;  ALUMINUM
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000249329600033
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99247
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:
Zhang, Zhen,Fu, Qiang,Zhang, Hui,et al. Enhanced methanol dissociation on nanostructured 2D Al overlayers[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2007,111(36):13524-13530.
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