Open AccessThe growth of CeOx(111) thin films on Ru(0001)
Author(s) -
Elfrida Ginting,
Jing Zhou
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/753/1/012009
Subject(s) - torr , oxygen , catalysis , x ray photoelectron spectroscopy , thin film , materials science , substrate (aquarium) , deposition (geology) , redox , chemical engineering , nanotechnology , analytical chemistry (journal) , chemistry , metallurgy , paleontology , biochemistry , physics , oceanography , organic chemistry , sediment , geology , biology , engineering , thermodynamics , chromatography
Ceria has attracted great attention in recent years in the catalysis community. Metal catalysts supported on ceria exhibit a promising catalytic activity due to the ceria’s unique redox properties and oxygen storage capacity. The purpose of this paper is to look at the fundamental aspect of CeO x (111) thin films on Ru(0001). The investigation presented in this paper utilizes the surface science method to understand the properties of CeO x (111). In one component, through a series of XPS studies, it is shown that the deposition of Ce in the presence of oxygen on Ru(0001) can produce ceria thin films. Fully oxidized CeO 2 can be obtained with an oxygen pressure of 2 x 10 −7 Torr. With the decrease in the oxygen pressure, partially reduced CeO x films can be prepared. Moreover, STM images are collected from the CeO 2 growth in the presence of 2×10 −7 Torr of oxygen and partially reduced ceria with oxygen pressures of 8×10 −8 Torr. These films can completely cover the Ru(0001) substrate. The measured step height is about 0.3 nm, which is consistent with the 0.313 nm spacing of O-Ce-O tri-layers in the CeO 2 (111) fluorite bulk structure.