Atomic scale control of catalytic process in oxidation of Pb thin films

作者：Kim, Jisun; Khajetoorians, Alexander Ako; Zhu, Wenguang; Zhang, Zhenyu; Shih, Chih-Kang^*

来源：Surface Science, 2012, 606(3-4): 450-455.

DOI：10.1016/j.susc.2011.11.005

• Cesium
• Lead
• Oxygen
• Scanning tunneling microscopy (STM)
• Catalysis

Using scanning tunneling microscopy (STM), we demonstrate that oxidation on Pb films is greatly enhanced by atomic Cs catalysts. With only a minute concentration of isolated Cs substitutional atoms in the surface layer (0.004 ML coverage), surface oxidation rates are greatly enhanced. First-principles density functional theory (DFT) calculations reveal that a substitutional Cs atom strongly increases O-2 binding on the surface. Then, with additional oxygen exposure this substitutional Cs-initiated oxidation process results in growth of PbO layers in an auto-catalytic manner. Furthermore, we investigate the role of temperature in the oxidation of the Pb films with and without Cs, and we explore the overall morphology of the resultant oxide layers.

• 出版日期2012-2
• 单位中国科学技术大学