Linked Life Data

20028144

Source:http://linkedlifedata.com/resource/pubmed/id/20028144

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
51
pubmed:dateCreated
2009-12-23
pubmed:abstractText
For the case of one-third of a monolayer of tungsten grown by atomic layer deposition on a hematite alpha-Fe(2)O(3)(0001) surface, we report direct atomic-scale observations of the structural and chemical changes that occur as this model interfacial system evolves from the as-deposited state to the oxidized state, then to the reduced state, and finally back to the oxidized state. In situ X-ray standing-wave atomic images relative to the hematite lattice show dramatic (but redox-reversible) changes to the W cation locations with respect to the occupied and unoccupied Fe surface sites. These structural changes are concurrent with X-ray photoelectron spectroscopy chemical shift changes, where W is observed to go from the 6+ to 5+ oxidation state. These novel observations of redox-induced cation dynamics in an oxide-supported catalyst are explained by models that account for W incorporation at the interface in Fe sites with various coordination schemes. Our proposed structure models are supported by our X-ray absorption fine structure measurements.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Dec
pubmed:issn
1520-5126
pubmed:author
pubmed:issnType
Electronic
pubmed:day
30
pubmed:volume
131
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
18200-1
pubmed:year
2009
pubmed:articleTitle
Direct atomic-scale observation of redox-induced cation dynamics in an oxide-supported monolayer catalyst: WO(x)/alpha-Fe(2)O(3)(0001).
pubmed:affiliation
Department of Materials Science and Engineering, Institute for Catalysis in Energy Processes, and DND-CAT, Synchrotron Research Center, Northwestern University, Evanston, Illinois 60208, USA.
pubmed:publicationType
Journal Article