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学科主题: 物理化学
题名: The unique surface reactivity of monolayer Ag supported on Si(111)
作者: Yao YX(姚运喜) ;  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 unique surface reactivity of monolayer Ag supported on Si(111) Qiang Fu, Yunxi Yao, 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 A metal film catalyst is a well-defined model system, which can be used to study the quantum size effects in catalysis. In this 2D or quasi-2D catalyst system, there is one dimension falling in the nano regime such that extraordinary catalytic properties may result from reduction in the size of this dimension. Here, we studied the surface reactivity of 2D Ag catalyst surfaces and found exceptionally low surface reactivity of a monolayer Ag film to CCl4 in comparison to that of the bulk Ag. A well-defined monolayer Ag film with the superstructure of Ag/Si(111)-(√3×√3)R30o has been deposited onto the Si(111)-7×7 surface and characterized by STM. The surface reactivity of the monolayer Ag surface was probed using CCl4 molecules. XPS, UPS, STM, and PEEM results show that the monolayer Ag surface is quite inert to this molecule. CCl4 adsorbs on the surface molecularly at 110 K, which completely desorbs at 150 K. In contrast, the bulk Ag surfaces are very reactive to CCl4. Both molecular and dissociative adsorption of CCl4 on bulk Ag surfaces at 110 K have been observed. Furthermore, CCl4adsorption on the monolayer Ag surface and the bulk Ag surface has been directly imaged by PEEM, which clearly shows the significant difference in the surface reactivity. UPS and XPS data demonstrate that the electronic structure of the two surfaces is different to each other. The different surface reactivity may be attributed to the variation in the Ag surface electronic structure which is strongly dependent on the Ag film thickness.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/112940
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:
Yao YX,Fu Q,Bao XH. The unique surface reactivity of monolayer Ag supported on Si(111)[C]. 见:17th International Vacuum Congress (IVC-17). 瑞典. 2007-7-1.
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