Subject Area物理化学
The adsorption of methanol on 2D Al overlayers grown on Si(111)
Zhang Z(张镇); Fu Q(傅强); Bao XH(包信和)
Conference Name17th International Vacuum Congress (IVC-17)
Conference Date2007-7-1
Conference Place瑞典
Funding Organization国际真空科学,技术和应用联合会
AbstractThe 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. 
Document Type会议论文
Corresponding AuthorBao XH(包信和)
Recommended Citation
GB/T 7714
Zhang Z,Fu Q,Bao XH. The adsorption of methanol on 2D Al overlayers grown on Si(111)[C],2007:59/1.
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