Scanning tunneling microscopy studies of Mn-doped CeOx(111) interfaces

作者：Ginting Elfrida; Peterson Erik Wayne; Zhou Jing^*

来源：Applied Catalysis B: Environmental , 2016, 197: 337-342.

DOI：10.1016/j.apcatb.2016.04.020

• Ceria
• Manganese
• Dopant
• Scanning tunneling microscopy
• X-ray photoelectron spectroscopy

The growth and structure of Mn on reducible ceria were investigated under ultrahigh vacuum conditions with X-ray photoelectron spectroscopy, low energy electron diffraction and scanning tunneling microscopy techniques. Submonolayer coverage of Mn was deposited on well-ordered CeOx(111) (1.5<x<2) thin films by physical vapor deposition method at room temperature. Mn is oxidized and formally in the +2 oxidation state on both fully oxidized and partially reduced ceria. Oxidation of Mn is accompanied with the reduction of ceria. STM results show the presence of atomic-layer high islands of Mn forming Mn-O-Ce linkages uniformly distributed on the ceria surface. With heating to higher temperatures, these Mn0 features can coalesce to form slightly larger two-dimensional structures. Our combined spectroscopy and microscopy studies demonstrate a strong interaction between Mn and ceria supports. Introduction of Mn can form mixed Mn-Ce oxides at the interface which can represent model metal-doped ceria surfaces for further examination of the chemical behavior.

• 出版日期2016-11-15