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学科主题: 物理化学
题名: The adsorption of methanol on 2D Al overlayers grown on Si(111)
作者: Zhang Z(张镇) ;  Fu Q(傅强) ;  Bao XH(包信和)
会议名称: 17th International Vacuum Congress (IVC-17)
会议日期: 2007-7-1
出版日期: 2007-07-01
会议地点: 瑞典
通讯作者: 包信和
部门归属: 五室
主办者: 国际真空科学,技术和应用联合会
摘要: The adsorption of methanol on 2D Al overlayers grown on Si(111) Zhen Zhang, Qiang Fu, Xinhe Bao State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, P.R. China 2D metal film catalysts can be used as the well-defined model systems to study the quantum size effects (QSEs) in catalysis. The unambiguous identification of the QSEs concept only relies on the accurate control of the catalyst film thickness. Epitaxial growth of metals on semiconductors provides a well-controlled route to prepare 2D metal film catalysts. In the present work, 2D Al overlayers were epitaxially grown on Si(111)-77 surfaces and three different Al/Si(111) superstructures were obtained by controlling the nominal thickness of Al: 0.25 ML Al/Si(111) with the phase of -77, 0.8 ML Al/Si(111) with the phase of γ-99, and 16 ML Al with bulk Al structure. The morphology and electronic structure of the Al surfaces were characterized by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy (UPS). XPS indicated that the Al-Si interaction follows the order: 0.25 ML Al > 0.8 ML Al > 16 ML Al. Methanol was exposed to the three surfaces to probe the Al surface reactivity. XPS and high resolution electron energy loss spectroscopy (HREELS) results show that the Al overlayers with smaller thickness present higher reactivity to methanol. 0.25 ML Al overlayers favor the dissociation of C-O bonds in CH3OH in comparison to the surface of 16 ML Al film. The Al surface reactivity can be correlated with the electronic structure of the Al surfaces. 
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/112938
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Zhang Z,Fu Q,Bao XH. The adsorption of methanol on 2D Al overlayers grown on Si(111)[C]. 见:17th International Vacuum Congress (IVC-17). 瑞典. 2007-7-1.
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