Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.24: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster B

Unveiling the Structure Evolution of CO Adsorption on Ru(0001) and O/Ru(0001) by High-Resolution STM — •Qiwei Chen and Kai Wu — BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing, China

CO adsorption on metal/metal oxide is one of the most basic and extensively focused questions in the study of gas-solid interaction. It serves as fundamental background for many related heterogeneously catalytic and electrochemical processes. Here, we present a scanning tunneling microscope (STM) study of CO adsorption on both bare and oxygen pre-adsorbed Ru(0001) surface. With the aid of CO modified tip, the structure evolution of CO adsorption on bare surface is unambiguously resolved from individual molecule to (<root>3*<root>3)-R30o structure and finally to the (2<root>3*2<root>3)-R30o superstructure. On oxygen pre-adsorbed surface, CO adsorption is induced to form (2*2) structure by the preformed structure of oxygen. It is also suppressed by oxygen adsorption that leads to a much lower saturation coverage at room temperature. Our real time investigation unveils scheme of CO adsorption on Ru(0001) and O/Ru(0001) at various coverage in ultrahigh vacuum condition.