Interaction of D2O with CeO2(001) Investigated by Temperature-Programmed Desorption and X-ray Photoelectron Spectroscopy

The interaction of D2O with the CeO2(001) surface was studied with temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). It was found with TPD that D2O desorption occurs in three states with temperatures of 152, 200, and 275 K, which are defined as multilayer D2O, weakl...

Full description

Saved in:
Bibliographic Details
Published in:Langmuir 1999-05, Vol.15 (11), p.3993-3997
Main Authors: Herman, G. S, Kim, Y. J, Chambers, S. A, Peden, C. H. F
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
General, apparatus
Surface physical chemistry
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The interaction of D2O with the CeO2(001) surface was studied with temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). It was found with TPD that D2O desorption occurs in three states with temperatures of 152, 200, and 275 K, which are defined as multilayer D2O, weakly bound surface D2O, and hydroxyl recombination, respectively. O 1s XPS measurements for high D2O exposures, where multilayer water desorption was observed in the TPD, resulted in emission from only the substrate and surface hydroxyls. This is likely due to a nonwetting behavior of D2O on this surface with the formation of nanosized clusters. An analysis of the O1s XPS data indicates that the surface has a hydroxyl coverage of 0.9 monolayers for large water exposures at 85 K. This is consistent with a model in which the polar CeO2(001) surface can be stabilized by a reduction of the dipole in the top layer by the formation of a full monolayer of hydroxyls.
ISSN:0743-7463
1520-5827
DOI:10.1021/la990094u