title: Growth and characterization of epitaxially stabilized ceria(001) nanostructures on Ru(0001).
abstract: We have studied (001) surface terminated cerium oxide nanoparticles grown on a ruthenium substrate using physical vapor deposition. Their morphology, shape, crystal structure, and chemical state are determined by low-energy electron microscopy and micro-diffraction, scanning probe microscopy, and synchrotron-based X-ray absorption spectroscopy. Square islands are identified as CeO2 nanocrystals exhibiting a (001) oriented top facet of varying size; they have a height of about 7 to 10 nm and a side length between about 50 and 500 nm, and are terminated with a p(2 × 2) surface reconstruction. Micro-illumination electron diffraction reveals the existence of a coincidence lattice at the interface to the ruthenium substrate. The orientation of the side facets of the rod-like particles is identified as (111); the square particles are most likely of cuboidal shape, exhibiting (100) oriented side facets. The square and needle-like islands are predominantly found at step bunches and may be grown exclusively at temperatures exceeding 1000 °C.
authors.affiliation: Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany. flege@ifp.uni-bremen.de and MAPEX Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany.
authors.forename: Jan Ingo
authors.initials: JI
authors.lastname: Flege
authors.affiliation: Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany. flege@ifp.uni-bremen.de.
authors.forename: Jan
authors.initials: J
authors.lastname: Höcker
authors.affiliation: Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany. flege@ifp.uni-bremen.de.
authors.forename: Björn
authors.initials: B
authors.lastname: Kaemena
authors.affiliation: Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 - km 163, 5 in AREA Science Park, 34149 Trieste, Italy.
authors.forename: T Onur
authors.initials: TO
authors.lastname: Menteş
authors.affiliation: Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 - km 163, 5 in AREA Science Park, 34149 Trieste, Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Sala
authors.affiliation: Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 - km 163, 5 in AREA Science Park, 34149 Trieste, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Locatelli
authors.affiliation: Department of Physics, BITS Pilani, Pilani 333 031, Rajasthan, India.
authors.forename: Subhashis
authors.initials: S
authors.lastname: Gangopadhyay
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA.
authors.forename: Jerzy T
authors.initials: JT
authors.lastname: Sadowski
authors.affiliation: Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Sanjaya D
authors.initials: SD
authors.lastname: Senanayake
authors.affiliation: Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany. flege@ifp.uni-bremen.de and MAPEX Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Falta