Growth and characterization of epitaxially stabilized ceria(001) nanostructures on Ru(0001). Issue 20 (11th May 2016)

• Record Type: Journal Article
• Authors: Flege, Jan Ingo; Höcker, Jan; Kaemena, Björn; Menteş, T. Onur; Sala, Alessandro; Locatelli, Andrea; Gangopadhyay, Subhashis; Sadowski, Jerzy T.; Senanayake, Sanjaya D.; Falta, Jens
• Is Part Of: Nanoscale. Volume 8:Issue 20(2016)
• Page Start: 10849
• Page End: 10856
• Publication Date: 2016-05-11
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c6nr02393b
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : CeO2 (100) nanostructures form during high-temperature molecular beam epitaxy and are stabilized by a coincidence lattice at the interface. 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.