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学科主题: 物理化学
题名: Unique reactivity of confined metal atoms on silicon substrate
作者: Yao YX(姚运喜) ;  Liu X(刘新) ;  Fu Q(傅强) ;  Li WX(李微雪) ;  Tan DL(谭大力) ;  Bao XH(包信和)
会议名称: 14th International Congress on Catalysis
会议日期: 2008-7-13
出版日期: 2008-07-13
会议地点: korea
通讯作者: Xin-He Bao
部门归属: 五室
主办者: International Association of Catalysis Societies and the Korean Institute of Chemical Engineers
摘要: When small metal assembles such as single atoms or small clusters consisting of a few atoms are supported on the semiconducting or oxide substrates, the sp electrons in the metal can be confined by the metal-substrate interface, which may be critical to surface reactivity. To shed lights on the electron confinement effect, in particular the sp electron confinement, in supported metal atoms and its effect on the catalytic activity, we report here a comparative reactivity study of bulk Ag(111) surface and a Ag monolayer film on Si(111) surface by means of scanning tunneling microscopy (STM), ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS), photoemission electron microscopy (PEEM), and density functional theory (DFT) calculations. Ag deposited on Si(111) can form a stable periodic array of Ag atoms confined in a 2D Ag monolayer film on Si(111) with the (√3×√3) symmetry. The most simple halogen methane, CCl4, was chosen as the probe molecule to study the surface chemistry of the Ag surfaces due to the high activity of halogen towards Ag. Our study shows that these two surfaces present distinct reactivity towards CCl4 dissociation. Monolayer Ag is inert toward dissociation of CCl4 compared to bulk Ag. Specifically, it is found that confinement of 5sp electron of Ag atoms in the √3×√3-Ag-Si surface, which is delocalized in the bulk Ag(111) surface, is decisive to the different reactivity.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/112932
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,Liu X,Fu Q,et al. Unique reactivity of confined metal atoms on silicon substrate[C]. 见:14th International Congress on Catalysis. korea. 2008-7-13.
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